Most shop vacs use suction airflow to cool the motor. If you use one on a vacuum table you'll likely burn up the motor.Gigawatt - thank you that looks like it would work great. How thick are your spoil boards to start with? How deep are your recessed holes? I would assume about 1/2 way through the spoil board to allow more resurfacing. What do you do hold down small pieces? Tabs or d.s. tape?
I have 3/4" mdf bolted to the frame. The t-tracks are bolted to this layer on 6" centers. The actual spoilboard is the 3/4" mdf inserts that fit between and overlap the tracks.
For small parts I use a small vacuum table with used hvac vac pump.
This part of my post may need reposted in a different place on this forum but, I'm still considering building a vacuum table (not sure if I will build a whole table or just a smaller piece (2x4 or so) to mount when I need it, but if I do a larger piece or the whole table I'd like to have valves to turn off sections (probably 2' x 4' or so), when they aren't in use, can anyone tell me if a large shop vac or a vacuum for a commercial car wash vacuum would be enough for a 4x8 lr would I need multiple vacuums?