how to clamp cylinderical part in 4 axis vmc without runout

[mskumar]

Dear sir,
I have facing problem against cylindrical part clamping in 4 axis rotary table in vmc. because now i had clamped with three jaw chuck ,but run out can't control with in 20 micron.I need solution for this problem.

[awerby]

It isn't going to hold things absolutely accurately; there's a certain amount of runout in even the best of them. If you need to hold this cylindrical part within 20 microns, you'll need to use a 4-jaw chuck and dial it in with a test dial indicator in that range. It will take longer, but get closer to what you want.


Andrew Werby
ComputerSculpture.com — Home Page for Discount Hardware & Software

Dear sir,
I have facing problem against cylindrical part clamping in 4 axis rotary table in vmc. because now i had clamped with three jaw chuck ,but run out can't control with in 20 micron.I need solution for this problem.

[mskumar]

Dear sir,

Thank for your suggestion,(use four jaw chuck for controlling run out) but i want to run production parts . so loading time 2 mints only can spend,so pl suggest any other way for quickly with repeatability clamping method .we are wasting time for clamping and adjusting run out in the part.

[awerby]

If you spend the money, you can probably find someone who can fit a collet system into your rotary table, that would accurately hold your parts. It won't be cheap, though. You might post something in the Fixtures and Workholding forum to find someone to help you with this.

Andrew Werby
ComputerSculpture.com — Home Page for Discount Hardware & Software

[neilw20]

Add some smart software to the machine so it can find it's own zero with a probe, and compensate accordingly.

[nate]

Just buy a quality collet chuck for your 4th axis.

20 microns is approximately .00078 inches. thats hard to hold in production unless you have a good quality collet chuck.