Vacuum Workholding for Small Parts | Pierson Workholding Vacuum Chuck
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- Опубликовано: 27 июн 2024
- A vacuum chuck is a perfect solution for holding large, thin workpieces, but what about smaller parts where less surface area means lower holding power?
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Pierson Workholding President Jay Pierson walks through the tips, tricks and science for holding small parts on a vacuum chuck.
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00:00 Vacuum Chuck for small parts
00:31 Parts that need to be machined
08:25 Cutting parts with Pierson Workholding Vacuum Chuck
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Outstanding video that covers almost all the vacuum tool path and operation tricks I've learned over the years. One other thing about partitioning parts first, leaving a thin floor is that it allows the sheet to become more flexible and better conform to the gasket, pull a better sealing vacuum and hold better for the rest of the run. Another tip is to shut off your air nozzle (secondary coolant) at the end while trimming that 0.010 floor away. You're barely generating any chips from that cut, evacuation is a non issue, but the air stream is surprisingly effective at forcing air under a part and breaking seal. Hopefully the air did it's job earlier and evacuated chips from the slots because the cutter can stuff those under the parts as well.
Keep it up, you've proven a very fast learner and an exceptional executor in many facets of the business.
Love these videos man! Keep them up!
This was an excellent tutorial - thank you very much for making the video.
Excellent walk through Jay!
Very well explained and demonstrated. I can't wait to add a vacuum pallet to my cnc. It will be perfect for machining motorcycle sprockets.
Jay I missed this video when it came out. It's so good!
Excellent video Jay.
Very nice process and video, well thought out and illustrated, very cool, thank you
Awesome video Jay! I can tell you really put effort into making this. It shows =)
Excellent info, Jay. You're a great teacher. Thank you!
Tom Z
Tom Zelickman Thanks Tom!
Awesome! So educational!
Thanks for the tutorial
Great video, Thanks
Excellent video (Y)
really nice.
Very slick.
Thanks a lot
Scope of the vacuum chuck
Can it be used on surface grinding machine.
Each time need special design for special jobs
Also do you find your part lifts slightly on the seal area due to the seal, or any over hang outside the seal so if you were facing the top face of the parts you will get slight variances in thickness between the edges and the centre of the flat part?
A
nice job! Creative approach. However why not just laser cut the parts?
Hi i see your tooling plate doesn't have any channels under the part for the vacuum only a single small hole? do you not need channels for the vacuum to suck the part down?
A
What are the two "set screws" for?
Impressive although I think milling the pockets instead of going for a straight window cut adds lots of time to the cycle. The cutting tool seems like it wouldn't last long if it wasn't for the blowing gun pointing at it thou, but same as you I would use a str8 o-flt cutter. Well done! It reminded me of a similar job I did once, we used to trim thousands of these lil tabs daily. :)
Its better to deal with chips that wont damage the end mill or work piece rather than huge chunks of material that are cut loose
Great explenation, thanks!
Is there a need to recess the space inside the gasket in any way to draw a vacuum, especially as there are no channels? Or is everything just in the same plane and the material imperfections or so are enough?
From looking at it, the part and chuck surfaces are smooth, but on a molecular level there is plenty of room for air to move. Keep in mind there is plenty of room between the two right before the vacuum draws them down to full contact.
great video. Are the vacuum profiles smaller than the parts being cut?
Yes, slightly smaller by about .020" in from the edge.
A thing to note for your hold down force: The maximum amount of vacuum achieved goes down the higher in elevation you get. Any Venturi pump that will draw 28"Hg (93% efficient) will only draw 25"Hg at around 3000ft. This is important to note when doing your hold down calculations.
Correct! Let's convert that to PSI of holding force. For every 1000 feet of elevation the holding force in psi decreases by a 1/2 lb. So with your numbers, the holding force at 3000 feet is 12.5 lbs per square inch.
Anyone done science or something to find minimum weight lb needed to hold down?, as where I am been thinking to put a cnc mill (3040 router) in a slight vacuum to reduce noise when cutting
nice vid, I am not in the metal industry and it might be a stupid question but how deep is the groove for the gasket? I have 3mm.
Cheers
.100" or 2.5mm
How does drilling the thru holes not eliminate the vacuum? Upon looking again they are not thru holes?
They are not drilled thru. Explanation at 7:11
What about clearance from stock bottom and vaccum table, if I understand you don't have any clearance.
Thanks
gasket creates clearance by raising part
Thanks for answer
hydrocut and a 2 chamfer drills. otherwise, nice tutorial, thanks for sharing. ps. that aluminum vacuum base looks damn expensive. made for only 500 parts? looks more expensive than those 500 parts.
Right? That's what I thought. I made a similar one out of wood and did wonders. He's got a great concept bout the gasket thou, smaller the better.
I had to subscribe because you had 666 subscribers........
Song name???
4:45 what's 20,000th in metric? What unit are you using?
.020" = .508 mm
Thanks
@@boogerking7411 As a metric person, I try to remember that "40 thou" is about 1mm.
So would a vaccum chuck have less holding power at the top of mt everest?
Yes, it would hardly work at all. Maybe 1/2 lb of holding force per square inch.
Are you actually cutting into your vacuum plate slightly?
Yes, by about .010" deep, but only on the first cycle. Sometimes it's a good idea to go deeper the first cycle (~.030") to cut a clearance trough and shallower all the following times just so the endmill has some space under it.
Can I use it for stainless sheet
Yes
what is the material
huntercat12 Polycarbonate
These look like panels for squonk style vaporizers.
What about the screw holes?
They're also interpolated to leave a flat bottom with 0.010" material at the bottom. The leftover material is easily removed by hand with a countersink which leaves a nice chamfer.
Good video, but it's not a column of air. If air were a solid, it would be a column. But air is a gas, it exerts force from all directions. While the column of air explanation seems fancy, it's 100% scientifically inaccurate.
You're right. The "column of air" is just an easier way to picture it.
Dear sir I need a vacuum work holding device please contact person contact number in Maharashtra India
No, go to store.piersonworkholding.com