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Mikester (in )
said:

| What's the rule of thumb for amount of vacuum/pressure required to
| hold a flat part for milling operations?
|
| I need to machine up aluminum and plastic plates.
|
| Aluminum plate 4"x4" square
| flat plastic puck 2.5" round
|
| Can anybody point me to some links for low cost DIY alternatives to
| buying a plate/pump set?

Mike...

There's a link in my sig to a DIY how-to for building 4"x4" vacuum
pucks.

These are intended for CNC wood routing applications; but you may be
able to use/adapt them for milling flat aluminum and plastic parts.

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto/assembly.html