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If you cant, then dont clamp it at all!.
Skin it!

In here i have to program and machine several sets of roundish aluminum pieces with +/-0.001" outside tolerance. and within 0.002" thickness repeatability.
Instead if fixturing it one by one i decided to skim cut a 33" x 23" x5/8" to within 0.0015 flat. And then machine each piece completely leaving .005" outside to holt everything together.

Worked out great. 

for pics

 

--Eldar Gerfanov

Comments:

Pages:(1) [1]
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By Eldar Gerfanov

October 13, 2012, 4:44 pm

IMAG0018.jpg
2 types of parts 6 pieces each - 12 parts total per sheet!

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By Eldar Gerfanov

October 13, 2012, 4:49 pm

IMAG0020.jpg
this is how each part looks like. as you can see its almost impossible to finish  it in one setup any other way

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By BAMCNC.com

October 28, 2012, 5:07 pm

I'm doing something similar, can you explain in more detail exactly how your doing it, I'm having issues.

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By Eldar Gerfanov

October 29, 2012, 12:20 am
Updated by: admin October 29, 2012, 12:22 am

Well, i think the 1st post is self-explanatory.
But if you are having issues then i will be mose successful in helping you if i know what those issues are.
Are you having hard time keeping them together?
If yes then the trick to that is simple: rough and finish to within 30 thou from breaking through, and then finish only in 2 steps if 12 or so thou until you are within 5 thou wrom the table.
The plate however needs to be VERY flat - otherwise some pieces may go balistic on you.
BTW sometimes i cheat and apply a drop of CRAZY glue in the middle when i am not too sure ;)

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