"leonard" wrote in
:

thanks guys,
I have read the grounding post before.And have consulted my wife the
(PHD in electrical engineering) also about the grounding and she say
not to. What I'm trying to pick is the material to use as ducting,
pcv, havc or special made spiral duct, ect. I have Six machines to
hook up and a floor sweep with 1 1/2 hp dc(with a chip collector).

And did your PhD wife comment on the pvc grounding technique in the
archives? ;-)

Whatever you plan to do for ducting, figure a chip seperator into your
plans. A barrel, some S&D fittings, and a chunk of plywood for a lid, and
cleaning the system gets so much easier.

I used 4" S&D, with my 1.5hp Delta, because I could get it from the local
hardware store. My hand tools make the biggest mess in the shop now.

Patriarch