Tube in Casting in Pressure Pot

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Russianwolf

Russianwolf

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Okay, so I have a question.

I noticed that in some of my tube in casting without pressure some resin finds its way into the tubes sometimes. Do you guys that use pressure experience this? What do you do if anything to minimize the effect?

I've got my PP on the way, and will be attempting this next weekend hopefully. I'm planning on just 30-40psi so may not need to modify the pot at all for now.

Been getting inspired to revisit some of my old artistic talents from years gone by (paints, inks and other cool stuff I haven't touched in years that may look nice on a pen).
 
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i suppose it depends on what type of molds you are casting in. And the reason i say that is because some molds are not intended to be pressure cast in.
 
Expand on that, if you would Seamus. I have several types, Resin savers, 1x1x6 blue silicone, slab molds, 1-1/5x3 PVC pipe for stoppers, so on. Any of those on the "No Pressure" list?
 
I've had a hit and miss relationship with all types of molds and keeping resin out of the tubes. The best thing I've used are silicone plugs from argon. They're made for powder coating systems and work great with resin.
 
these are only my opinions:

-any of the tube in casting molds will pose problems.

It has been my experience that you would need elevated sides on the molds in order for it to work. What happened when i tried it was that the resin was pushed down into the casting cavity and left the top section of the tube exposed. I really dont know how to explain it other than that. I have found that under the conditions that i cast in, the resin savers and the silicone plugged molds that Ptown sells, were not intended for that purpose. This is by no means a knock on either one of their products, just that they didnt work at the pressure(60psi) that i use. I will say, that using a silicone plug to plug the tubes is the best method of preventing any resin from getting on the inside of the tube. hope this helps.
 
seamus7227 said:
these are only my opinions:

-any of the tube in casting molds will pose problems.

It has been my experience that you would need elevated sides on the molds in order for it to work. What happened when i tried it was that the resin was pushed down into the casting cavity and left the top section of the tube exposed. I really dont know how to explain it other than that. I have found that under the conditions that i cast in, the resin savers and the silicone plugged molds that Ptown sells, were not intended for that purpose. This is by no means a knock on either one of their products, just that they didnt work at the pressure(60psi) that i use. I will say, that using a silicone plug to plug the tubes is the best method of preventing any resin from getting on the inside of the tube. hope this helps.
Click to expand...

I have used mine with pressures up to 50# with no problems. You just have to make sure you get a tight seal between the plug and tube and when you reposition the mold that seal doesn't come loose. Not always easy but can be done if you are careful.
 
Russianwolf said:
Okay, so I have a question.

I noticed that in some of my tube in casting without pressure some resin finds its way into the tubes sometimes. Do you guys that use pressure experience this? What do you do if anything to minimize the effect?

I've got my PP on the way, and will be attempting this next weekend hopefully. I'm planning on just 30-40psi so may not need to modify the pot at all for now.

Been getting inspired to revisit some of my old artistic talents from years gone by (paints, inks and other cool stuff I haven't touched in years that may look nice on a pen).
Click to expand...

I have both the ResinSaver moulds that Charlie used to make and the silicone plug type moulds that Fred Wissen makes.
With both these types of moulds I use either no pressure at all or a max of 20psi. Most of the time I get away with doing it without pressure.
30-40psi would be asking for trouble with these moulds.
 
I have been casting Sierra tubes in the silicon plugged molds that ptown sells. I have been using 60 psi with no problems. Only issue I had was not seating the plugs securely on the initial run. After that, no more issues.
 
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