Quote:
Originally Posted by magnets
What did you do for your vacuum set up? Our team made our vacuum from a board with a ring cut around it for a o ring like thing, then we used 2 shop vacs to pull the material down. We've had some success using it with plywood, but we just can't get aluminum to stay still.
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Our cnc's vacuum table came with it from TechnoCNC. However, your set up sounds like it should work. Ours has recently had problems holding materials down, but this is where the screws come in. The screws hold the aluminum to the sacrifice board and the sacrifice board gets sucked down holding the aluminum with it. When that doesn't work, like it sometimes doesn't, we have had two options, which work best in combination. One, you can cover the extra spots on the sacrifice board where the material isn't with papers in plastic sleeves. This makes it so that the table isn't trying to suck down air, lowering the pressure. Instead, it is all sucking down the material, holding the pressure. The second option, which is a lot more fun, is to sit on the material. This pushes the material down to the table and the table holds it down afterwards. The other thing we do is turn all of the valves off on ours when we turn it on, and one by one turn the valves to open the vacuum at different spots on the table where our material is. I have also heard that using tape around the sacrifice board and material will help, but I haven't tried it yet.