Vacuum Table Advice

[ptjw7uk]

Sounds as if the seal on each box is variable.
Why not make a dedicated fixture so that each unit has the same cross section of vacuum. Remember that the force from the vacuum is dependant on the area under each unit. Is the vacuum from the cleaner sufficient! Most vacuum pomps are posituve displacement devices!
Just a few thoughts!

peter

[Minium]

Thanks Peter,

I've attached a photo to show how I was doing it. Obviously all 6 locations had a box in them. Each aperture in the jig is 140mm x 80mm. The unused holes around the edge are blanked with masking tape.

Playing around this morning I'm almost convinced that it's a lack of suck from the vacuum cleaner. Sticking a box onto the end of the hose, via a holey rubber mat, it felt like I had enough retention. However, I guess that via the vacuum table that amount of suction is being divided 6 ways.

When you say that most vacuum pumps are 'positive displacement' what does that mean?