I have a limited uspply of sheet pvc (1/4") and had considered doing
this, but was a bit leary of cutting up the sheetstock and then screw
up cutting the threads.....
What I am making is a retaining ring that has a flange on it so it can
clamp a funnel shapped cup to a flange with an O-ring seal between the
two.

I happened on a few items called protein skimmers that leaked at the
adjustment knob shaft, and figured out a way to cut that apart and
remachine the shaft and housing to include a o-ring seal like later
models have, unfortunately when the company threw out these leaking
skimmers on warranty replacement they retained the colleciton cups and
pumps. The going price for a replacement cup complete with retaining
ring is $48.90 each.......and that does not include the cap for the
cup, which would be a piece of cake to make once I get the cup and
retaining ring made.....so is life.....Pumps I have , so I can save a
lot of $$$$ if I can get the retaining rings made. I also need to find
the name of a plastic, which is described in another post.
Regards


On Sun, 22 Jan 2006 23:08:00 GMT, RoyJ wrote:
BTDT: PVC is pretty flimsy stuff. I'd solvent glue it to a 1/2" pvc
plate, chuck up the plate, turn the threads, cut it off. Of course, I
have some PVC sheet stock available so that is the first choice.

Roy wrote:
I am in the process of making an item for my sal****er setups, and
have to thread the inside diam of a 3" socket joint (happens to be
correct bore needed for my application and only needs threads) which
are 13 tpi. My biggest problem is if I tighten the piece up in the
chuck it distorts it. I ruined a bunch of pieces trying to find a
sweet spot n chucking prressure with out distortin oor without having
it slip. Even with light cuts its gone wrong. Perhaps I need to put it
all away and give it a try on anaother day, unless someone can suggest
something that may work to hold this piece in the chuck without
distortion or slipping. I have played with super glueiing it, double
faced tapes, but one thing I have not tried net is to glue two or
three lugs on the outside of the piece I am turning and allow them to
hold against the chuck jaws sides.........hmmmmmmmthat idea just hit
me, is there anything else that may work?

PVC is neat to machine, but it can get awfull flimsey and such when
chucked up.....

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The original frugal ponder! Koi-ahoi mates....