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Old 05-19-2017, 05:37 PM
Chris Marriner Chris Marriner is offline
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Corking a cylindrical steel pipe mold

OK - So I am making some tumblers and want a consistent 3.5" diameter - so I figured using a steel pipe as a mold would work... I have the pipe and am going to attempt to cork it using Ed Skeels Instructions...

Here are my questions:

best way to bake it?? Standing up, laying down?? I'm worried about the linseed oil being affected by gravity and slumping to the low side...

How much of the linseed oil runs off the surface??

Should I do this in a baking pan??

Boiled linseed oil?? or do I need to boil it again to thicken the viscosity??

If the linseed oil is too thin - should I mix some cork in it and make a "paste"??

I read somewhere that Linseed Oil vapors are flammable - can I do this in my electric annealer or electric kiln??

Should I scrap this idea - and just use a sheet of cork and some adhesive...

I've got about 20 other questions too... but I'll start with those!!

As always, I appreciate your input!!
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Old 05-19-2017, 10:45 PM
Charles Friedman Charles Friedman is offline
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First make sure your pipe is of the seamless type. Also have you tried to use it with just wax, no cork? If cork is what you want, heat the pipe first a bit, then a few drops of the linseed oil ( pipe on end) then sprinkle the cork dust into pipe, once the linseed oil has cool a bit and still is tacky, let the cork adsorb the oil and heat again and repeat three times. If it gets too wet, do this with the pipe on its side, keep rolling it to keep from pudding. (do not over heat) After last coating of cork, stand on end and let it drain off excess oil. Then bake at 350 for about an hour. I think there is "corking" in the archives somewhere. With all things in glass, it is a matter of heat and timing. To remove old cork or to do again, just run the mold up to about 1000. There will be nothing left but ashes.
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Last edited by Charles Friedman; 05-19-2017 at 10:47 PM.
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Old 05-20-2017, 05:41 AM
Justin Zotynia Justin Zotynia is offline
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cork

I have one black pipe tack welded to a metal plate holes drilled in pipe to let out steam. I used sheet cork about 1/8 inch thick cut to size to fit the pipe. you could put some spray adhesive on it. works great.
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Old 05-20-2017, 07:08 AM
Eben Horton Eben Horton is offline
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I have done some huge steel molds with linseed oil and cork. Jim Moore has some good directions on his page for his wonder blocks and that is what I used. Yes raw linseeed oil is highly flammable and once on the first blow in one of the molds, it went off like a cannon and lifted the glass up as I pulled it out, but it was because I did not have vent holes. If the mold is vented the oil will burn in in a more safer way.

Last edited by Eben Horton; 05-22-2017 at 07:12 AM.
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Old 05-22-2017, 06:41 AM
Kenny Pieper Kenny Pieper is offline
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Sheet cork is much easier. I make tumblers using sheet cork inside a p.b.c. pipe. No need to even glue it if you make it tight enough. When the cork gets funky just press it out and slide in a new sheet.
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Old 05-23-2017, 06:43 PM
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Franklin Sankar Franklin Sankar is offline
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Kenny Did the pvc get soft and wonky?
Ops sorry I now se it. You used Pbc whatever that is.
Franklin

Last edited by Franklin Sankar; 05-23-2017 at 06:45 PM.
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Old 05-23-2017, 10:23 PM
Cecil McKenzie Cecil McKenzie is offline
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If you use sheet cork it is good to turn the mold over every time you make a glass . Otherwise it will gradually make the bottom wider and the glass won't come out. i put the mold on a piece of marble with holes drilled to let steam escape.
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Old 05-24-2017, 06:43 AM
Kenny Pieper Kenny Pieper is offline
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Quote:
Originally Posted by Franklin Sankar View Post
Kenny Did the pvc get soft and wonky?
Ops sorry I now se it. You used Pbc whatever that is.
Franklin
Franklin I misspelled it is P.V.C. and no it doesn't get hot enough to get soft.
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Old 05-24-2017, 09:53 AM
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Sky Campbell Sky Campbell is online now
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PVC poly vinyl chloride emits toxic fumes at fairly low tempatures. I want to say it's less then 200f. Be safe live long.
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Old 05-24-2017, 01:45 PM
Cecil McKenzie Cecil McKenzie is offline
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Sky is probably right... I use stainless pipe and a fairly strong fan to suck away smoke from cork.

http://www.consumer.org.my/index.php...outgas-poisons
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Old 05-24-2017, 03:35 PM
Jordan Kube Jordan Kube is online now
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If you can't find seamless tube locally onlinemetals.com is a good resource.

Stainless:
http://www.onlinemetals.com/merchant...ep=2&top_cat=1

Aluminum is quite a bit cheaper:
http://www.onlinemetals.com/merchant...p=2&top_cat=60
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Old 05-24-2017, 03:48 PM
Cecil McKenzie Cecil McKenzie is offline
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Jordan , I thought about mentioning that site but didn't so it is good that you did. i have used aluminum before. It works but I have found that with the water we have a white film builds up on the aluminum .
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Old 05-27-2017, 04:28 AM
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Franklin Sankar Franklin Sankar is offline
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Thanks Kenny. Glass has many surprises for me even if you think you heard it all.
Franklin
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Old 05-28-2017, 12:00 AM
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Greg Vriethoff Greg Vriethoff is offline
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Quote:
Originally Posted by Sky Campbell View Post
Be safe live long.
Many people use plywood, OSB, and other types of particle board in the hot shop. Engineered lumber puts out lots of toxic fumes when heated/burned. I forbid its use in any situation where I'm in charge.
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Old 06-01-2017, 10:32 AM
Justin Zotynia Justin Zotynia is offline
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steel mold

I've got one I'm not using but I think it is only three inch diameter with the cork.
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