Originally Posted by
jTr
I built the "black box" ala Gary C about 10 years ago. This means :
- A single concentrated vacuum source, containing all 4 motors
- switched in pairs = minimum 2 running at a time (~15-16 amps per pair)
- "booster" pair not needed unless hideous piece of warped ply is on the table (almost never)
- 5 zones, flow controlled by plumbing valves = you can send the force of all 4 motors to a single zone for max hold-down
After this many years of reliable service, I highly recommend this approach.
jeff