Black Box Vac Source
Here is a project I have been working on for a while in my spare time. Now that it is up and running, I thought I would post a few pics and the specs.
There have been dozens, if not more, versions of enclosures for aftermarket vacuum motors posted and this is not that different in construction, but control. Either 2 or 4 of these motors can be operating at a time and switchover is done using relays and a vac switch from Joe Woodworkers kit parts.
The vac source consists of 4 Lighthouse Brand LH-7123 240V motors. These are 10.4 inHg/110 cfm units each. Combined they should pull close to 10 inHg and have close to 400 cfm. Testing has shown this to be a very powerful vac source, and holds over 9 inHg when applied to less than the full 4 zones.
Box is made from Melamine, full dado joints using eCabs for design. Assembled using silicone for seal/adhesive and screws with finish washers.
I used a 24V 3PDT 10A relay for each motor. A vac switch, set to approx 7 inHg, kicks in 3rd and 4th motors, should the vac fall below 7.5 inHg when cutting. There is a check valve, a' la Brady Watson between the 2 pairs of motors. Control is low voltage remote at front of table and allows full automatic, 2 only or all 4 as options.
Here are the pics of construction. I will post installed later.
