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Vac Table Grid Pattern - What's Optimal?


What is the optimal grid spacing for a vacuum table on our CNC? We can mill the pattern to whatever size we want.

We do primarily solid wood -we will gasket down parts directly, use fixtures and use pods. I thought it would be easy to find online, so far, nothing!

Also, since vac power is a function of surface area, wouldn't it be better to have more grooves and smaller squares? Another way to ask this is if I gasket off a 2' square and put a piece of wood on this and in one scenario I have 2" squares in the groove grid pattern and another I have 1" squares - wouldn't the 1" squares pattern have more vac power since there are more grooves - the empty area that determines the vac power?

2/14/17       #2: Vac Table Grid Pattern - What's Opt ...
jerry Member

There is no such thing as the perfect you have to decide what is best for you every cut has different needs

2/14/17       #3: Vac Table Grid Pattern - What's Opt ...

My question is very general - what is the grid pattern cut permanently into the CNC router table for the gasketing? Is there any kind of universal standard or norm? - e.g. 1" centers on groove spacing? 35mm?

I would like to hear what is "normal" in the industry and any thinking on more vs less grid lines.

2/14/17       #4: Vac Table Grid Pattern - What's Opt ...

To be more clear - see the photo, my question is about optimal permanent table grid spacing.


View higher quality, full size image (693 X 574)

2/15/17       #5: Vac Table Grid Pattern - What's Opt ...
james e mcgrew Member


I have built two grid tables for my machines.

1,5" elevated squares .5 wide .5 deep grooves set in 24" x 48" pattern including boarder for each zone x 4 to make one total in 4 zones 48 x 96.

om 5 foot table has an 12 x 96 running parallel to the 4 x 8.

on my next table we are going with 5 x material only so zones will be 60 x 24 x 4 zones

2/15/17       #6: Vac Table Grid Pattern - What's Opt ...

Here is my thought. You want to be able to gasket fixtures down and also use pods. I would have to physically check my table, but I use 8mm round gasket for securing fixtures and bleeders to the table. You also want to use pods. Why don't you call GreenBVC or one of the other pod suppliers and ask what grid spacing their stock pods are set up for? My pods are set for 120mm spacing, but ask about what depth is optimal as well. In short, my table works really well, the grid spacing is 24mm on center cut with probably a 7mm or 7.5mm tool so that the 8mm gasket compresses slightly as you insert it. Vacuum access holes are 180mm apart. Email if you want a dxf or dwg of the layout.

2/15/17       #7: Vac Table Grid Pattern - What's Opt ...
Mike McClaran

Thanks for the call Scott. In short 30mm centers with a 1/4" bit at 7.5mm depth. This is the norm, but from one mfg to another this can vary .5mm or even sometimes 1mm.

2/15/17       #8: Vac Table Grid Pattern - What's Opt ...

Thanks all. Got it. 30mm OC, cut with 1/4" bit, 7.5mm deep. Is this "Biesse" grid or "Komo"? Someone referred to these as common but different norms in the industry.

The last CNC I had built I just assumed they would do the grid to a standard but found that all the "squares" in the grid pattern were actually rectangles by about 2mm, making off the shelf pods impossible.

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