Vacuum chucking 2

- G
- Gerald Ross
  
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posted
17 years ago

Fri, Oct 13, 2006 4:18 PM

Still trying to get into vacuum chucking. I bought a "double sealed" bearing an set it up per Bill Noble's fine instructions. My pump pulls

25 in HG but through this setup it only pulls 9-10 inches. Air was blowing through that bearing like Katrina. I converted the bearing into a sealed bearing and now get 19-20 inches through the the setup.

Here's how I did it. I smeared a film of silicone grease on the face of the bearing and wiped it off with a paper towel. Then I covered it with hot melt glue, starting around the pipe nipple and going outward nearly to the rim of the bearing.

Still working on the gasket. Tried the foamie from Wal-Mart. It sheared off first try. Applied a large bead of hot-melt glue, chilled it in the shop refrigerator then turned it to a curving even surface. Still no joy so far. Maybe I didn't use enough glue. Tried household goop before that. It would probably work if I could get an even surface. It dries similar to hot melt glue but remains more rubbery.

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- l.vanderloo
  
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posted
17 years ago

Fri, Oct 13, 2006 9:24 PM

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- mac davis
  
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posted
17 years ago

Sat, Oct 14, 2006 4:47 PM

Try an old mouse pad.... contact cement will hold it and you get instant gratification.... (glue the slick side to the chuck)

I went through several revisions of the rotary valve... the one that works best for me is NOT made of wood, which moves with moisture changes..

I cut a circle out of a scrap of corian a little bigger than the hand wheel on my lathe, then got a sealed pump bearing at OSH and drilled a small hole in the center of the disk for the vacuum, and then used a forstner the size of the bearing to drill 2/3 of the way through the disk... I used contact cement to fasten the corian to the hand wheel, (on the Jet 1442 it's a flat disk, on the Jet mini it's tapered to fit inside the hand wheel), then trued it to the size of the handwheel with a sharp skew... a little sanding with 800 grit and a bit of wax and it now had a better hand wheel..

Since I don't use the "ram rod" on the 1442, I skipped the turned down brass fitting and went with a nylon fitting that press fit the center of the bearing and has a right angle hose barb for the vac line... works really well... (the right angle fitting keeps the vac line from twisting)

Mac

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