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Originally Posted by bigben2k
Yeah, that'll work. Jon Fettig is familiar with Delrin, you might want to ask him.
The choice of plastic here may depend on your sealing solution: if you use a gasket (RTV silicone) then your choice is wide. If however you choose to machine a groove for an o-ring, your options are going to have to include the "machineability" of the plastic. A minor issue, but still something you might want to be aware of...
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For sealing the block to the top I have both 1/8" x 2-1/8" buna o-rings and sheets of buna and strips 2" wide x 5 feet. The strip material does a fantasic job of sealing my HD block and the o-rings did well with the aluminum so I would imagine copper and a hard plastic would seal easily as well...leaning towards the lexan again. I dunno if the poly-ethylene is resiliant enuff. Does the polyethylene seal against an o-ring well? If it does well with o-rings I'll order that from McMaster-Carr. There's a glass company locally that has lexan scraps, I'll try milling some if I get out shopping today.
I would imagine copper/hardplastic to seal just as well as this did.
Actually I know it does. I have a maze3 kicking around somewhere, oddly never used it.
The middle piece has no o-ring channel, the top piece has one on the underside(it was easier milling)
thanx for any insights,
-MC
Had to edit this to add on...no reason to repost.
This post was originally started to discuss this idea...concerning the zinc isuue tho I think I can easily replicate this in copper...actually easier:
this was fabicated by milling a 1/8" channel down the center (longitudinally) of a 5-1/2" piece of 1/4" aluminum. I used a ball-end endmill to mill the top for the tube to sit in and used zinc to solder the pieces together. I think I can easily replicate this in copper. The unit clamped the stick of ram very nicly as I had put the flat piece in a vise it crimped it ever so slightly and made for perfect pressure. I had milled it off center by accident, not allowing for the correct cutter compensation which made it work all that much better. I think I can easily mill out 3 of em with the center stick having it's tube on the center of the top of the flat and the right and left units having their tubes offset respectively to allow for them to sit all 3 side by side.
Again thanks for any insights,
-MC