Re: [CAD_CAM_EDM_DRO] Re: Need a vacuum system for acrylic sheets

having worked in sheet plastics, the trick is to not cut all the way through the paper layer on the acrylic. It is about .001 thick, and by ofsetting up that far, you can just cut the part out with a stanley knife. We used MDF over the vacum chamber, and covered the excess of the table with sheet plastic.

turbulatordude <dave_mucha@...> wrote:

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "kdoney_63021"
wrote:

>
> I have tried small vacuum pumps, with no success. I have even tried

a

> shop wet dry vac with no success. Has anyone used a venturi system
> for large sheet work? I am using bullet catches through MDF

(atually

> melamine) with about an inch of vacuum space. Is there a better

way.

> I would be interested in purchasing a system if I could find one

that

> would work with Bob Campbell's gantry design (low to the ground).

Look at the cut path. if you can cut in such a manner as to have a
section done, you can then lay a plastic sheet over that area.

the biggest problem is that the cut area is an open window. at some
point, there is no vacuum that will work.

Considder that a 1/4 inch cutter on a 12" line has an open area of 3
square inches. that is like a 2 in open pipe. you could not afford
to run a pump that could maintain a vacuume on such an opening.

The better method is to make a sacrifical part with large spaces
under the non-cut areas. Then the cut lines are not open to the
vacuume.

Dave





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