Davenport Machine’s High Precision (HP) Head is specially designed to replace the standard revolving 8-SA head. ABEC 9 angular contact radial bearings now replace the standard bronze bushings, significantly improving spindle stiffness and rigidity. This advanced design allows the HP Head to run with more precision and accuracy. In fact, the HP Head provides index repeatability to within 0.0006 inches.
The new five-spindle design — now standard on the Davenport HP and Hybrid Machine — offers a range of unique benefits which ensure optimal performance for all Davenport machines.
Key Advantages of Our HP Heads
Running duplicate layouts of the same part on a machine equipped with an HP Head versus one running an 8-SA head, the HP Head will hold tolerances 30-50% tighter than a brand new 8-SA head. In addition, the increased spindle rigidity allows for wider and more accurate form tools, eliminating, in many cases, the need for a shave tool and freeing up a valuable tool position. The HP Head also allows for improved part diameter accuracy.
2. Thermal Stability
The HP Head will only produce 1/3 of the temperature rise from room temperature at any given spindle speed. A machine with an 8-SA head running at 135°F, will run temperatures around 92°F at the same RPM with the HP Head. For most parts, this also means that no tooling adjustments need to be made as the machine “warms up” or “cools down” during morning start-ups and stock-ups. Most parts run on an HP Head have almost no size changes due to temperature. Lubricant temperatures stay lower, which allows for more effective cooling of tools, as well as extended lube life. Lower running temperatures also help keep the shop floor temperatures more stable and comfortable.
The Outer Spindles of an HP Head are directly supported by 5 Super Precision Angular Contact Ball Bearings. The bearings, in an arrangement similar to what you find on most of today’s single spindle CNC Lathes, are rigidly mounted directly into the Revolving Head, not in bolt-on housings. These heavy pre-load bearings have ZERO play, compared to the .0015-.0020 clearance in the bronze bushing of a new 8-SA head. As a result, part accuracy and repeatability are more similar to a CNC Lathe than a traditional Davenport Multi Spindle. Additionally, 50% wider form tools can be used and surface finishes are generally improved 30%. Many parts that previously could only be run on 6 and 8 spindle machines can now run on 5 spindles with substantially shorter cycle times.
4. Long Life Span
The Angular Contact Ball Bearings of the HP spindles are rated to last 16+ years in a typical application. These bearings will maintain almost new accuracy for 95% of their service life, until they ultimately lose their pre-load and need replacement.
All 5 spindles are constantly lubricated by an advanced air-oil lube system that pressurizes each bearing cavity, maintaining a flow of clean, cool, lubricated air through each bearing. This is achieved while providing back-pressure to each bearing seal to keep chips and contaminants out.
Lastly, the OD of the HP Head is treated with a low-friction, micro-textured hard coating that significantly reduces wear not only on the Head OD, but also on the mating bore of the machine bed. After 15 years of service, the first four machines equipped with HP heads have seen no measurable wear on the Head OD or machine bed bore. Uncoated heads typically see the head gap wear open .001 to .003 larger than the “new” condition during that time frame, and may require expensive machine re-builds to continue making high quality parts.
5. Lower Maintenance/Operational Costs
Higher accuracy and thermal stability leads to better production efficiencies. With a conservative 5% increase in productivity, the HP Head can put out an estimated additional 100 hours – or $5,000 – of production each year, based on a $50.00/hr machine cost.
Additionally, the HP spindle ball bearings last roughly 16x longer than the 8-SA’s bronze boxes and thrust bearings. The average annual maintenance cost of an 8-SA Head, including parts, labor, and lost production hours, is approximately $2,250. HP heads have an estimated 16-year maintenance interval, with an annual amortized cost of just $344.
Machines equipped with HP Heads use approximately 40% less lube oil. On a machine running 2,000 hrs per year, that’s approximately 22 gallons less per year, or an annualized savings of around $112.00.
With over a hundred years of experience in advanced machine technology, Davenport Machine is proud to offer some of the most innovative, long-lasting solutions on the market. Along with our other cutting-edge products, the HP Head is designed to help you streamline your processes, while reducing costs and improving productivity.
To learn more about our product offerings, we invite you to browse our comprehensive library of technical literature. For more information on our HP Head specifically, check out our FAQ guide
The new Davenport Hybrid Machine is the future of Davenport multi-spindle machine tool technology. It incorporates the best of the mechanical versatility you have come to expect from Davenport, and leverages the power of an intuitive CNC interface to make operation and set-ups easier than ever.
These new capabilities answer to many of the internal demands of your workforce. The retirement of your most tenured operators can lead to a loss in tribal knowledge. Training a younger generation, whose skillsets are very different than those of generations past, can be challenging and time-consuming. The Davenport Hybrid brings real solutions to issues of workforce development.
We recently sat down with John Henderson, Davenport Manufacturing Engineer, to talk about his experience with the new Davenport Hybrid Machine. John is a recent (2018) graduate from Rochester Institute of Technology with a Bachelor’s in Mechanical Engineering. At the time of this publication, John has been working with Davenport Machine for a little under two years.
Prior to his hire at Davenport Machine, John had little to no experience in an action manufacturing environment.
Can you talk a little bit about your journey from engineering student to Davenport Manufacturing Engineer?
When I first joined Davenport, we were just beginning to make parts on the Hybrid concept (prototype) machine. It became my responsibility to learn how the machine operates. I read a machining manual on basic G-code which all of your typical industry standard CNC machines follow, and shadowed one of our more experienced manufacturing engineers. It was through that hands-on experience that I picked up on the operation of the machine.
The Hybrid Machine has been designed from the ground up to be easier to program, setup and operate. Can you talk about your training and use of the machine?
From Day One the Hybrid was designed with the end user in mind. Davenport machines historically had to overcome an impression that the machines were challenging to set up and run. All of our design criteria for the machine involved trying to mitigate that notion about Davenport.
There are several features on the machine that make it, well, not the legacy Davenport machine. All of our tooling on the machine is quick-change tooling, which can be set up and pre-set on the bench while you’re running the machine. That way, when it comes time to swap out tools, all that’s required is a couple bolts and you’re back up and running!
In my opinion, one of the better features of the machine is your ability to comp diameters in your CNC slides on the fly, without shutting down the machine. Say you’re running a part and your tolerance is starting to creep up. With the press of a button you can offset an update so that the next part that’s presented to that tool will have that comp reflected in it. This allows you to can keep your parts in tolerance part after part after part without stopping the machine.
Were you involved at all in the programming of the machine?
Yes, we get to wear a lot of hats here. I had my hands on everything from design, set up, customer part runoffs, and programming the CNC axis.
What is the easiest part about operating the Hybrid Machine?
Unlike the legacy Davenport Machine, the Hybrid doesn’t have clutches and brakes, where you have to reach into a machine and pull a lever to operate it. Our Hybrid is outfitted with a 15-inch touch screen, and the operator has all the information necessary to run the machine right in front of him/her. You can access all of the functionality of the machine on one page, while the machine is active and running parts. The user interface is super easy to navigate, and I think that makes the machine that much easier to use.
What would you say to someone who has little to no manufacturing experience, who needs to train on the Hybrid Machine?
First and foremost, gone is the need for years of mastering the intricacies and “art” of the Model B. The Davenport name is on the machine, which means the highest quality engineered and produced machine, but it’s not your traditional Model B. It truly is a CNC machine that the next generation can learn to operate quickly and easily. That was the whole purpose of releasing this product. Don’t be intimidated by the history: it’s a lot simpler now.
What kinds of things are you now capable of performing on the machine?
In previous generations, all of your side working axis were controlled by cams. In order to present a tool to a workpiece, you had to have a cam made which would drive your tool in and out. That takes time, and downtime means lost potential revenue! First, you have to call us and have a cam made, sent to your facility, and installed.
With CNC control, you can create a new cam in a matter of minutes with the click of a button, bypassing the four or five days it previously took with the legacy machines. That’s a huge advantage.
Davenport Machine focuses on continuously improving our genuine OEM parts through redesign and customization to enhance the value of these items for our customers. We do not just sell replacement parts to fix problems—instead, we work with our customers to implement the optimized, durable, and cost-effective solutions they need. Throughout more than 100 years in the business, our primary emphasis has been on delivering quality solutions at competitive prices to our customers.
New and Improved OEM Replacement Parts
At Davenport, our Engineering Exploration and Advancement Group focuses on developing improvements to our parts and manufacturing practices. In the last few years, Davenport has made millions of dollars in investments to improve our production equipment and processes. These capital investments have brought about substantial progress in our manufacturing efficiency and quality, thus dramatically impacting our ability to produce superior parts at competitive prices.
Listed below are some of our new and improved OEM replacement parts:
9-27 Stationary Heads
Davenport’s updated manufacturing process for our 9-27 stationary heads resulted not only in a more aesthetically appealing part, but also a number of improved functions:
More accurate taper angles, increasing contact with mating boxes.
More accurate spindle positions.
Interchangeability with all current Davenport OEM components.
These changes are backwards compatible, so they do not require any changes on the customer’s end.
8-SA-OS Oversize Revolving Heads
Davenport’s 8-SA Oversize Heads are now available in custom sizes up to Ø8.850. This is an improvement from the previous maximum of Ø8.790. This is the largest Revolving Head size allowed that will fit within the ring gear. These larger heads allow customers to get several additional rebuilds on machines that have already been re-bored to an oversize condition, resulting in an increase in the service life of expensive machines by many years. The larger oversize head can be interchanged with all of our OEM parts, and is manufactured with the same quality and precision you would expect from Davenport OEM revolving heads.
SB-849–200 Coolant Pumps
Identifying our traditional coolant pump as Davenport’s single largest contributor of machine noise, we’ve upgraded the system with a robust pump that improves operator comfort and safety, while outperforming on coolant pressure and flow. The older positive displacement gear-pumps, both chain driven and direct drive, produce a distinct noise that can be heard over all other gear and tooling noises. The new SB-849-200 uses centrifugal vane technology to deliver larger amounts of coolant than previously possible, at higher pressures for most viscosity coolants, and while generating less noise, heat, and vibration. The new pump can also handle larger abrasive particles without risking pump seizure.
Key features of this new pump include:
Virtually silent operation
Average of 8-10 dB drop in machine noise levels
Powerful 3 HP motor frees up machine power for chip making when replacing chain-drive units
3 stage stainless steel impellers
Carbide seals and bearings
Large 2” NPT inlet and outlet to maximize flow
2-3x more flow at typical viscosities
30 GPM at 50 psi (~SAE 30 motor oil / 80 cSt @ at 40° C
45 GPM at 40 psi (~SAE 30 motor oil / 80 cSt @ 40° C
Maximum recommended viscosity 500 cSt @ 40° C
Available retrofit kits for most Davenport machines
Made in USA
BP-600 Cam Operated Rear Brake (Davenport Brake)
Davenport is now manufacturing a new alternative to the standard 5080-187-57-SA rear brake. The BP-600 Cam Operated Rear Brake uses a Cast Iron Brake shoe, and solid bronze drum for a long, trouble-free life. Its main features include:
Larger surface area between the shoe and brake drum creating strong braking force
Elimination of radial loads being placed on the camshaft that could cause wear in bushings
Stops the tool spindles from lunging forward while using extra springs on cam levers or positive return cams
Easier adjustments, and long-lasting consistency
Less frequent adjustments of the brake, improving function of the high speed clutch
Only relies on mechanical actuation through a cam profile and drive dog
Interchangeable parts to similar cam operated rear brakes
Innovate With Davenport Machine
Any parts supplier can sell you yet another replacement part for your problem. However, Davenport’s highly trained and experienced staff members are able to provide timely technical support and real solutions to our customers.
For information about these new and improved parts—or any of Davenport’s products—please contact us today.
The HYBRID machine incorporates the best of Davenport’s mechanical versatility with the CNC Technology you need to address today’s most difficult manufacturing challenges.
This article highlights some of the new technologies incorporated in the HYBRID machine, and speaks to some of the parts it is better able to produce.
The Hybrid utilizes proven High Precision (HP) Head technology. With over 200 HP Heads in operation, counting for a combined total of nearly 1,600 years and over 3 million hours of run time, this technology has stood the test of time, and produced outstanding results for our customers. Every customer who has bought a revolving head has bought more. Even the first HP Heads installed over 25 years ago are still making parts today, and 80% of them have never required any maintenance whatsoever.
The Hybrid comes in 7/8″ and 5/8″ models, offering HP Head configurations with Aligning Gears or Spindle Stopping.
High Pressure Coolant
Many of today’s parts are being produced from difficult to machine materials. Whether it’s pre-hardened materials, tool steels, stainless or lead-free alloys, each present a challenge for screw-machine operators.
When we looked at ways to improve chip control and tool life, one of the most promising methods was using high-pressure coolant. Traditional flood coolant may work on brass and 12L14, but it doesn’t do the job when you are turning A286. You need directed streams of coolant, at high pressure, to be able to break through the vapor barrier created by the high cutting temperatures on these materials. Because the HYBRID has multiple tools engaged with the part simultaneously and since screw machines use wide tools with unconventional chip geometry, special considerations need to be made to effectively use high pressure coolant in the HYBRID machine.
We turned to Chip Blaster, a market leader in high-pressure coolant pumps, and integrated their 1,000 PSI, no reservoir pump into our machine. ChipBlaster can deliver up to 10.5 gallons per minute to a ceiling-mounted manifold, which can direct coolant to up to 8 tools at any point in the cycle. It’s fully programmable, so it’s only flowing coolant when the tool is in the cut. The pump fits nicely under the stock reel.
The HYBRID delivers shorter setups by using its CNC capabilities to digitally replace and store many of the “mechanical adjustments” from older platforms. We eliminated mechanisms like the side cam banks and turnbuckles. Saved programs now contain information like speeds, feeds, and tool lengths, so you can quickly reset a job on the second run, and make parts that are in-tolerance on the first cut. Dialing in the sizes has never been easier. Many major adjustments are tool-free, precise, and take seconds.
When running families of parts, we suggest designing ZERO-POINT DATUM tooling, a concept where the cut-off is the same distance from the spindle face for each part in the family. Inserts and tools can be swapped without the need to mechanically re-align tools, further reducing setup time and complexity.
What kind of parts are we targeting on the HYBRID? Essentially, parts that couldn’t be done effectively on a Davenport before.
Features like angular trepan grooves where the tool needs to make 2 axis movements are perfect for this machine. The HYBRID will excel at holding tight tolerance OD’s, with a particular improvement in overall length (OAL) control over previous models. The thrust ring no longer holds the head in place. The Revolving Head’s axial position is held by the bearings, and does not vary from index to index, so tool lineup, and OAL capabilities have all been dramatically improved. This also improves the ability to hold very fine finishes on cut-offs and seal faces. The HYBRID’s high degree of pre-load and stiffness is critical, and will give you an advantage over other screw machine platforms when making parts from difficult to machine alloys, or with thin walls.
We’ve upgraded many sub-systems on the HYBRID to meet our customer expectations of what a modern machine should be. For instance, the first thing people notice when they walk up to the HYBRID is that they can actually hear and see what is going on inside. Several changes to the drivetrain, increased gear quality, and enclosure modifications have reduced machine decibel level. It’s roughly the equivalent of going from standing next to a lawnmower, to eating inside a casual restaurant. To aid visibility, we replaced the single tube light with 4 banks of powerful LED’s, providing twice the illumination, and directed in a way that eliminates shadows in the work zone. Coolant levels and pressures are all monitored digitally, and all lube tanks, air filters, and fire suppression triggers have been relocated on a central “PM” panel near the operator.
This article will delve into some of the more specific machine upgrades we’ve implemented on the new Davenport HYBRID machine, on shave tools, chips, conveyors, and casting.
“Do we have too many skilled set-up people?” This is a question you probably never hear at your shop. It’s a fact of life in this industry: highly-skilled set-up people are in short supply, and their time is too valuable to waste.
Shave Tools represent one of the most difficult tools to master. We estimate 30% or more of set-up skills and set-up time is dedicated to properly adjusting shave tools. Not having to put a shave tool in the machine just makes your set-ups easier and faster. It also makes your set-ups and your machines more productive in the long run. Opening the “shave” position allows the HYBRID to manufacture what may have been traditionally considered 6-spindle parts on a 5-spindle machine.
With the new HYBRID, our Davenport team put a lot of effort into improving the chip evacuation. Many of the newer alloys can be stringy, making it difficult to break the chip. To combat this problem, we eliminated the center drive and the tool post stops. Now you essentially have a digital version of the tool post stop in the offset page. This allows the chips to drop through the machine unimpeded.
The HYBRID boasts a 22” wide chip conveyor belt built into the base pan. The conveyor and pan have been designed as a 360° wash-down system. As chips fall onto the sloped pan surfaces, everything is washed down into the chip load zone of the conveyer by the oil. You’ll get more chips out of your machine without manual intervention, and those chips will be drier. This way, you don’t have to spin all that oil back out, and keep replenishing your sump.
Speaking of the sump, the entire HYBRID machine base has been redesigned from the ground up. It has roughly three times the oil capacity of previous platforms, to help maintain thermal stability over long running jobs. The massive steel tubular bracing provides a super stable, vibration-dampening platform for the machine bed. The conveyor load area is capable of flowing 50 gallons of oil per minute, so you can run both low- and high-pressure coolant pumps flat out, and be assured you will not swamp the machine. The machine base is equipped with two huge cartridge-style pickups at the bottom of the sump, to make sure your tools never run dry.
Even with all this extra capability, the HYBRID base and enclosure has a similar footprint to our HP or Model-B platforms, and it takes up less than half the floor-space of most competitive multi-spindle machines.
We’ve strategically reinforced several areas of the main casting, allowing us to hold tighter tolerances. We’ve added significant amounts of material, in particular, around the 1st position slide. From a layout perspective, you’d like to do the most aggressive machining in the 1st-position. But on previous platforms, the cam bank mechanics really hindered our ability to provide a rock-solid casting in that area. On the HYBRID, however, the side cam bank is gone, and it’s allowed us to gusset the entire 1st position slide mount. Additionally, we’ve been able to eliminate the 2nd position linkage bar. The result is that the 1st position slide is now mounted on one of the heaviest parts of the casting, and can take tremendous cuts without vibration.
All these improvements make the new Davenport Hybrid an excellent value when compared to much larger and more expensive machines with similar capabilities.
Now that we’ve improved the two fundamentals of multi-spindle production, being able to place the part repeatedly in the same position at every index, and being able to deliver the cutting edge to the same point every time, we can leverage some of this machine’s unique CNC abilities to deliver more accurate parts. The HYBRID has the ability to offset each of these tools, for every spindle independently, in .0001” increments. That’s a huge deal for anyone running parts on a Davenport now. You can’t pick a tenth off using mechanical turnbuckles on a machine. Now you have the ability to run your first 5 parts, and DIGITALLY dial in the nominal size spindle by spindle for each tool. You can hold a very narrow tolerance band across all five spindles on your machine, and all without mechanical adjustment.
As your tools wear, you have a “One Touch” adjustment for each tool, so as your average part size starts to grow a few tenths from nominal, you can go into the control, on the fly, and digitally adjust your form tool to bring those parts back into the middle of your part tolerance.
Next Gen Controls
The HYBRID has been upgraded with a new, state of the art, CNC control package. It boasts a 15-inch, color touchscreen display, engineered for rugged machine shop environment. The large screen size allowed us to combine multiple small pages of the older controls into a much more user-friendly layout. Fewer pages means less switching between screens and fewer menu layers to get to the functions you need most. Color-coded information is easier to absorb than text, and allows us to direct the operators attention to the most vital information quickly. Everyone owns a smartphone or I-pad, and everything is touchscreen. That’s how people think and expect to interact with their technology.
This technology is not just a pretty face. The hardware hidden inside the control cabinet is designed for maximum reliability and energy efficiency. With drive features like power-on-demand and regenerative braking, the HYBRID uses 50% less electricity, and generates 50% less waste heat than previous Davenport platforms. You save money twice, lowering your machine electricity consumption, and your Air Conditioning bills at the same time.
In an experiment on size control, we took one of our customer’s machine run-off tests and applied it across all three of our platforms, with the exact same tooling, speeds, and feeds on all three machine models.
The Model-B machine’s part size distribution tends to be very broad, with lot of outliers, big and small parts. As you step up to the HP, you tend to see a tighter distribution. The HP can make parts that are 2 to 3 times better than the Model-B. But the star of the show is the HYBRID, which was able to put all of its parts within a 4 or 5 tenth band.
This speaks volumes about what the HYBRID platform can do.
For some, CNC technology can be intimidating. That’s why we involved both experienced CNC users, and traditional mechanical Davenport operators, when designing the control interface. We made it easy for both groups to run this machine, and lowered the learning curve by simplifying the most common and difficult mechanical adjustments.
Nearly 20 years ago, Davenport established Davenport Machine University to train multi-spindle operators to use and maintain both the Model-B and Servo-B platforms. In the last 10 years, we’ve expanded our program to serve our internal employees as well, training several new classes of green machinists, and providing continuing education for our seasoned craftsmen. We have experience teaching 100’s of graduates, and we can train your workforce too.
The new Davenport HYBRID is the future of Davenport Multi-Spindle machine tool technology. It incorporates the best of the mechanical versatility you would come to expect from Davenport, and adds to it the CNC Technology you need to address today’s most difficult manufacturing challenges.
In this post, we dive into some of the design enhancements applied to the Davenport HYBRID machine with the goal of increasing profitability and productivity for our customers.
The first major HYBRID upgrade is how we support the revolving head, or the spindle carrier, into the main machine casting. Older versions of the Davenport Machine had a revolving head that was piloted in a hand-scrapped bore with a few thousandths of running clearance. For the HYBRID platform, we’ve taken our popular HP head design, and upgraded it with a set of 9” diameter bearings to rigidly and accurately mount it to the bed of the machine. This is a ZERO clearance fit, giving you rigid, accurate, and precise work holding so that the workpiece is introduced to the exact same place, every time the machine indexes.
We then looked at how to deliver the cutting edge to the workpiece. The most obvious differences on the HYBRID platform are the new CNC slides. Gone are the days of dovetail slides, tapered gibs, and the constant adjustments and quality issues that go along with them. Our new CNC slides are modular in nature, so customers are not limited to using old Davenport tooling. They are built upon rigid, pre-loaded linear rail technology, like you would expect to find on high-end CNC lathes and mills. This allows our customers to purchase a brand new HYBRID machine at or near the cost of rebuilding an older Acme, New Britain, or other multi-spindle machine platforms, by moving the same tools into the new HYBRID.
The 2-axis CNC slide on the fourth position will accept standard Davenport tooling, as well as 5/8 square shank stick tooling commonly found on CNC lathes. It gives customers the ability to:
Do profiling, angular trepan grooves, single point threading etc., with the XZ CNC slide.
Place ID tooling in this slide, and do INTERNAL grooves, deburring and complex operations from this traditionally external tooling position.
GANG tools, doing both OD and ID work on the same CNC controlled slide.
Stagger tools, having a standard end-working tool, like a drill, do it’s work early in a cycle, and once it has backed out, bringing another tool into the bore to machine o-ring grooves on the inside of a part. This way, even though you have a 5 spindle machine, you can bring up to 8 different ID tools into the workpiece.
The XZ slide is standard equipment for the 4th position on the HYBRID, and will be available as an optional 3rd position attachment in the near future.
Davenport DTS Dovetail Tooling System
The new tool holders of the Davenport Dovetail Tooling System (DTS) are available as Skive, Forming or generic 5/8 lathe stick tool configurations. With precision taper adjustments, length positioning, and center height adjustments, the DTS system is the most user friendly tooling to date. And all tool holders are equipped with thru-tool High Pressure coolant porting, which directs a high-pressure knife-edge stream right at the cutting edge of the insert, without placing copper lines and moveable nozzles in the cutting zone.
The Davenport DTS is specifically designed to be used with disposable carbide insert technology. Today’s cutting edge technology from major carbide insert OEMs provide the best tool-edge possible at the cheapest cost per part. The advanced tooling materials, hundreds of available coatings, and easy edge replacement make the HYBRID tool changes less frequent, easier than re-grinding, and more efficient.
The new Davenport HYBRID is the next generation of Davenport Multi-Spindle machine tool technology. It incorporates the best of the mechanical versatility you have come to expect from Davenport, and adds to it the CNC Technology you need to address today’s most difficult manufacturing challenges.
The HYBRID is a super-precise machine platform. It leverages the power of an intuitive CNC interface to make operation and set-ups easier than ever. With digital size control, CNC single point threading and turning capabilities, the HYBRID can hold tolerances never before produced on a Davenport. It does so while delivering a superior Return On Investment for your capital equipment dollars.
The Davenport HYBRID was developed specifically to address, and provide answers to some of the industry’s toughest challenges.
Tighter Tolerances – increasingly tight part requirements, along with tougher to machine materials, have pushed many cam-operated machines beyond their capabilities to consistently produce parts made within the print requirements
Smaller Job Sizes – require more frequent machine changeovers, that must be done quickly and efficiently, or risk eroding profits, or worse, creating losses
Changing Workforce – experienced operators retiring at a rapid rate are being replaced by a new generation of operators starting out with an entirely different skillset. With reduced in-house training programs, and demands to shorten the learning curve for new operators, companies are faced with a real problem
The Davenport HYBRID brings real solutions to these pressing issues.
Goal Driven Design
Our design philosophy started with identifying the end goal. In this case, increasing profitability and productivity for our customers. With that in mind, we started on a multi-year effort to evaluate each and every system on our machine for performance, and identify where we could make mechanical improvements. We then targeted the application of CNC technology, and state-of-the-art motion control, to areas that would maximize the benefit without significantly increasing the cost or complexity. The HYBRID is an optimal blend of CNC and cam-operated mechanical motions. Many machine functions are still mechanical, because it is the most robust and cost effective means of making precision parts. Profits and productivity, thru innovation, has guided every HYBRID design decision, and that is what separates this machine from the competition.
Next, check out Part 2 of the Hybrid Blog series, which covers “Design Choices.”
Screw machines simultaneously cut materials using a number of tools mounted on a spindle, yielding small final pieces. At the heart of these machines is a drum that operates multiple spindles, each of which rotates horizontally to perform tasks on the workpiece.
These machines can perform a number of operations on the workpiece within one rotation. They consist of many intricate parts, which perform complex tasks through the use of automated systems.
As such, it’s important to regularly troubleshoot and maintain multi-spindle machines to ensure smooth operation within your facility. Keeping your machinery cool, lubricated, and in good repair means less costly downtimes and higher degrees of accuracy in your manufacturing processes.
Set Up a Troubleshooting Checklist
Multi-spindle machine operators must ask themselves a number of questions to ensure their machines are in proper working order:
Is the Form Tool Diameter Changing in Size, Varying, or Chattering?
Check that the tool’s setup and head positioning maintain maximum rigidity. Then, look for any sloppy work spindle bearings and make sure that the tool has the proper center height setting. Verify the proper grind of your tool and check to see whether it’s properly supported during cutting. Look for a loose slide or tool, and make sure you tightly fasten all the bolts. Lastly, check for dull tools and make sure you’re working with the correct stop screw pressure.
Is the Hole too Big?
Verify that the machine is locking the head in the proper position, and check for sloppy spindles as these could signify off-center or chipped center drills. Next, check whether the drill is dulled or loaded up, and make sure the drill and spindle are properly aligned.
Is the Machine Stripping Threads?
Make sure the head’s locked properly, and verify that you’re working with the correct hole and body size. Look at the alignment of the spindle, and check for dull/loaded taps or dies. Finally, check the summary settings to make sure you’ve found the problem.
Does the Length Vary?
Many issues could cause variations in length. Most commonly, worn or sloppy bearings in the spindle or dull-end working tools can push work back into collets. Generally, loose, worn, or dirty collets can cause problems, and you may need to check for the proper feed finger tension on the five spindles.
At the bar end, check for a clean cutoff, and make sure the stock stop is tight, polished extensively, and at the right length of the stop plate. Feed the stock to the stock stop if this isn’t already the case. You should also check head thrust bearings as well as the rolls and pins on the end working cam lever for wear and tear.
Do the Parts Have Burrs on the Cutoff?
Evaluate the stop collar to make sure it has the proper pressure, and make sure the pickoff collet is adjusted properly. See if the cutoff is on center, and check the timing of the closing dog.
Is the Box Tool Dimension Rough or Varying in Size?
The box tool should have a proper grind and feed, so check for these first. Then, make sure the rollers have the proper tension.
Is the Hollow Mill Dimension Rough or Varying in Size?
Verify that the machine achieves the proper grind, and check for worn or loaded cutting edges. Then, look for the proper alignment and feed.
Has an Improper Step or Shoulder Appeared?
First, look at the form tool alignment and the box tool alignment, and then make sure the box tool has an appropriate travel distance. Evaluate the sharpness of the drills and verify that they reach the proper depth. Finally, check for any loose tools or holders.
Are the Rolled Threads Out of Form or Flaky Like the Scissor Type?
Look at the work’s feed or penetration, and check for the proper blank size. See if the blank has a taper, check whether the rolls are on the center of the work, and look for proper roll synchronization. Finally, check rolls for any nicks.
Is the Reamer Chattering?
It’s possible that there might be too much clearance on the spiral relief. You should also check to see whether it’s out of alignment. Make sure the feed is the right size for the particular reamer you’re using, and find and fix any low cutting edges.
Is There Tap Trouble?
If the tap’s cutting below the correct size, you might need a different tap for the job. The tap also must align with the workpiece. Look for proper float in the holder, and check to make sure that the hole’s of the proper size. Finally, check the summary settings.
Is the Knurl Out of Form or Flaky?
Make sure your blank’s the right size, and check both works’ feed and penetration. Look for taper on the blank, and check the knurl pins and the knurls themselves for signs of wear or nicks.
Preventative Maintenance For Multi-Spindle Screw Machine Services
Multi-spindle machines require comprehensive maintenance schedules. While you should perform some tasks daily, other processes require quarterly or yearly checkups.
Make sure you have sufficient lubricating oil levels in the lube pump reservoir. Then, check the machine pan reservoir’s coolant level. It may be necessary to clean the coolant intake pipe screen or pump screen, so check this as well. Make sure the stock reel and its support are in good condition and aligned, since they should be lagged to the floor. Finally, verify that the machine is properly delivering lubricating oil to the work spindle bearings.
Once a month, take each of these items off the revolving head, clean and inspect them, and replace them if needed:
Feed fingers (also make sure they’re appropriately tensioned)
Then, check on the wear and tear and general condition of the following parts:
Stock reels and stands
Clean the outer spindles with a boiler brush, and make sure the locating lever is locking correctly and that the roll turns. Check the condition of the following components:
Chuck slides, rolls, and pins
Cam levers, rolls, and pins
The shafts are particularly important: check for a potentially twisted front cam shaft, since the locating lever must clear the locating blocks on index, and you want it to make contact, angle side first, with 0.012” pushback when locking.
Check to see whether the revolving head has end play, and adjust the thrust ring if needed. Lastly, make sure that the locking nuts and set screws on the spindle change gear shafts are in good repair.
Once every quarter, clean the coolant pan: remove all coolant and get rid of any sediments and fine chips before adding new coolant. If you have long runs that make changing the cams difficult, take the cross slides off and clean them before checking for proper gib adjustments. Remove the plugs at the bottom of the worm gear housing, and flush the housing with an OSHA-approved solvent. Finally, replace the plugs, and fill with fresh oil.
Twice a year, drain, clean, flush, and refill the main lube pump reservoir. Check the filter, and make sure there isn’t excessive end play in the revolving head or thrust bearings. You should also verify that there’s no excessive looseness in the work spindles or tool spindles.
This is also a good time to check the condition of the electrical controls, including the switches, solenoid valves, wiring, panel box, cables, motors, and other elements, but make sure that only authorized personnel handle electrical control maintenance. Check pneumatics as well, including the air lines, valves, cylinders, and fitting.
Once a year, perform a thorough inspection and cleaning of the entire machine as a unit. Check the tool spindles to ensure proper alignment with the work spindles, and align special attachments to the work spindles as needed.
Check for any cracks or breaks in the cross slides, and make sure all levers, rolls, and pins are in good condition. Check the chip conveyor’s condition as well as the condition of all the lubricating and coolant systems, including the:
Multi-Spindle Success at Davenport Machine
Davenport Machine always seeks to provide the best machines, parts, and attachments in the screw machining industry. We’ve produced cutting-edge machining technology for over 100 years, and we continue to offer revolutionary and valuable machine options for multi-spindle screw machine operators.
To learn more about our machines and how Davenport can help you achieve your machining needs, request a quote today.
In today’s ultrafast internet environment, companies have an incredible number of options for their purchasing dollars. Why choose Genuine Davenport OEM Replacement Parts?
As an OEM, we at Davenport Machine, take pride in our 100–year history. However, time alone does not drive success. It is the dedication, innovation, and commitment to our customers, learned over our 100-year history that helps us maintain and grow our loyal customer base.
How does Davenport do it?
As stated by our CEO Andy Laniak: “Davenport Machine is singularly focused on making Davenport the most efficient, the most competitive, value creating production process for our clients to produce large volume, small parts.”
We achieve that by doing the following:
Davenport Replacement Parts: Davenport carries an inventory of over 4,000 parts, assemblies and attachments to serve our clients. We don’t cherry pick our inventory to sell parts with the highest margins. Rather, we fully stock all Davenport parts and are focused on helping customers find the best parts for their needs.
Quality: Davenport has invested in excess of $10 million dollars, over the past 3 years, in new equipment, and R&D thru the creation of our innovative Engineering Exploration and Advancement Group. This, in turn, has led to dramatic new efficiencies and product quality improvement in our manufacturing processes. All, leading to lower prices for our customers.
Customer Service: Years of experience with Davenport products allows our staff to provide technical support and real solutions to customers, rather than simply filling part orders. Our online customer portal allows for easy, quick order placement at the push of a button.
“No Hassles” Return Policy: Order the wrong part or the part not working properly. No problem. Return it and we’ll replace it immediately.
Finally, our mission as an OEM is to always offer the widest selection of genuine, high-quality Davenport Replacement Parts at the most competitive prices. Ultimately, we firmly believe by following this path, we will continue to provide strong value to our customers. If you have any questions about how we can help you find the appropriate Davenport parts or attachments for your machine, please feel free to contact us or call 585-235-4545.