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Discussion Starter #1
I was wondering if anyone had any secrets or input into being able to hold PETG or Lexan sheets to a CNC router table. I am running a KOMO MACH II router with a very good vacuum pump and have no issues at all holding MDF and other woods but I am having a real hard time holding plastics to the table. They lift off of the table with hardly any effort and move around when being machined. Any input would be appreciated.

Thx
 

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Are they thin sheets? What type of tooling are you using? If you are using upcut bits, try straight flute bits that won't lift.
 

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Welcome to the Router Forums.

Here is a link to a video that might have a solution for you, it's worth a try

You can jump to 5:45 and see what he has found to help him.
 
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Sheets are 1/8" thick. I have tried upcut and down cut. Upcut lift the sheets. Cutting on a MDF spoil board and never have any issues with other material but very evident when cutting PETG, Lexan and Plexiglass for some reason.
 

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Mark try the newsprint and see if it helps, it won't cost you much to do a test.
 

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My fabrication lab tech uses masking tape around the perimeter of thin sheets to keep the vacuum holding onto the parts being cut. This is on a Multicam CNC with vacuum bed sucking through MDF.

4D
 

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I apologize if I am stating the obvious, but make sure you are covering whatever part of the vacuum table, or zone, that is not being covered by the sheet. think I heard that vacuum can wander 2-3" in the mdf spoilboard past the sheet being held...
 
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