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General control line discussion => Open Forum => Topic started by: Paul Taylor on April 27, 2010, 09:00:50 PM

Title: I know a guy....
Post by: Paul Taylor on April 27, 2010, 09:00:50 PM

that has a lath. I want to try and make some venturi's. Anyone know what that white plastic looking stuff is called that people make venturi's out of?

And can I get it at Home depot or Lowes?

Thanks!

Title: Re: I know a guy....
Post by: Mark Scarborough on April 27, 2010, 09:08:57 PM

Normally,
its Delrin, not sure about home depot,, I know that Mcmaster Carr used to have it,, mail order

Title: Re: I know a guy....
Post by: Brett Buck on April 27, 2010, 09:10:22 PM

Quote from: Paul Taylor on April 27, 2010, 09:00:50 PM

that has a lath. I want to try and make some venturi's. Anyone know what that white plastic looking stuff is called that people make venturi's out of?

   Delrin (brand name), Acetal (generic name).

     Brett

Title: Re: I know a guy....
Post by: Larry Renger on April 27, 2010, 10:43:38 PM

For some reason, known in the orient as POM, probably related to the formula?  Nylon would work OK, but is a pain to machine as it is so soft.  Good old Aluminum is easy to machine and readily available.  Also, that should be a "lathe"; a "lath" is a strip of wood, which really is awful to use for machineing anything.  ;)

Title: Re: I know a guy....
Post by: frank williams on April 28, 2010, 07:47:19 AM

Try,
www.smallparts.com

http://www.smallparts.com/s/ref=sp_search?searchNodeID=16414291%7C350666011&keywords=delrin&Action=submit

Title: Re: I know a guy....
Post by: George on April 28, 2010, 09:43:14 AM

Quote from: Larry Renger on April 27, 2010, 10:43:38 PM

...a "lath" is a strip of wood, which really is awful to use for machineing anything.  ;)

It sure holds plaster on the walls, though.  8)

I have used nylon electrical spacers to make venturis a couple of times, but I was not using a lathe. I used a drill press, and an X-Acto. I don't recommend it...go with Delrin or aluminum.

George

Title: Re: I know a guy....
Post by: Dick Pacini on April 28, 2010, 11:33:56 AM

UHMW (ultra high molecular weight polyethylene) is an excellent material for that application.  I have machined it many times with great success.

http://www.olsonmfg.com/Material_Distribution/Material_List/UHMW.html

Title: Re: I know a guy....
Post by: ChrisSarnowski on April 28, 2010, 03:59:19 PM

You can make the nylon spacers work but it is miserable to machine. The Acetal / Delrin is much better.

I did the drill press / knife scheme on a few nylon spacers.

You can also get the Acetal rod off the 'bay.

-Chris

Title: Re: I know a guy....
Post by: Glenn (Gravitywell) Reach on April 28, 2010, 07:30:54 PM

Its also readily available on ebay.

Title: Re: I know a guy....
Post by: don Burke on April 29, 2010, 01:53:57 AM

Take your pick, 5/8" or 3/4" dia is usually a good start.

http://www.mcmaster.com/#delrin-rod-stock/=6v8s1o

McMaster-Carr usually delivers to me in SoCal in less than two days.