Re: [CAD_CAM_EDM_DRO] Re: part holding

Magnetic chucks are for grinding, Vacuum plates are for soft material like plastics and wood. For safety's sake you should always secure a part for maching in a positive mechanical holding device. Fly cutting on vacuum plate is dangerous should the part break free of the vacuum.

Ron
Keith Clark <mail@...> wrote:
I just remembered a friend of the family who was an outstanding
machinist for General Motors in Michigan. He used a magnetic chuck
in his garage shop. I also saw a used vacuum chuck at the local
machine tool store this week. What about these two options? Is
this an old question or fruit for a good discussion?

Keith Clark

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "skykotech"
wrote:

> The hardest part about cnc is not the electronics, the servos, the
> ballscrews. The hardest part is holding down the friggen part! I
> just ruined yet another brand new 1/2" made-in-usa endmill when my
> program had a rapid that went .010 too close to a holddown clamp

at

> 120IPM. Doh! I wouldn't have had things so close to the clamps

if

> it were not for the fact that I wanted to machine everything at

once

> without remounting the part. How do you guys hold down a part

when

> you want to machine 5 surfaces on it? Vacuum table? Glue? :-)
>
> Good thing Enco still has that free shipping going on...sigh

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