EL34's CNC Stuff

Tacking down parts with spray glue

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A sheet of 1/16" thick fiberglass being held down to a wood base using Krylon Easy-Tack

It can be tough to hold a sheet of material absolutely flat while you cut out shapes.
I have tried super glue, clamps, etc and nothing really worked well.

1/32" thick copper clad Printed circuit board material was the most difficult to cut because I am only cutting .005" deep to remove the copper foil and 1/32" is very thin.
If the sheet is warped, which they always are, you don't get a nice cut.
Another problem is that the sheet will rattle around as you start to cut out pieces and the sheet has less and less material.

I guess some companies use vacuum tables that will suck a sheet of material down to the CNC base, but that's not an option for most home CNC guys.

I always thought that some sort of very thin and light spray glue might work and so I went in search of a product.
I found a few products on the web by 3M and other companies that looked good.
I ended up using Krylon Easy-Tack with great results.

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Krylon Easy-Tack is a repositionable adhesive that is clear and sprays on super thin.
It has worked out great so far on the thin sheet type materials I use.
The label on the can states that you can use it on just about every material including paper, and you can reposition the material easily.
It has made cutting thin sheets of material on my CNC very easy.

I wasn't sure what to use to clean off the glue after you have cut a sheet of material so I tried mineral spirits.
Mineral spirits seemed to clean Easy-Tack off the wood backings I use and the material sheets but it left just a bit of residue.

The can says just to wash your hands with soap and water.
I was able to clean off all residue on fiberglass sheets with warm soapy water.

Note that the spray cans I got from Joann fabric were 5.5oz. The part number is 7021 on my 5.5oz cans.

Here's a link to Joann fabrics which had the best price I could find on the web.
http://www.joann.com/joann/catalog.jsp?CATID=cat3270&PRODID=prd33862

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