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rxfish

Ring worm mold

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a 2 piece ring worm type can't be poured even if it has a straight tail.

the problem is the way the plastic flows, it will pick up major bubbles and not give you a full rings most of the time, some times it does work but its not worth the hassle of putting them out cause if it doesn't work people will complain.

then you have the curl tail problem

Now if you want to make one that works better than a alum one then you make it out of RTV or pop Plastic has better flow characteristics with these than alum., when your making it grab some piano wire in about .025 dia and stick about 4-6 in every ring, this will allow it to flow and fill the rings better.

this is much easier to do then with alum, and its a lot cheaper. having a machine shop drill holes all the way around each ring will cost hundreds especially with a 2 piece mold.

Sometimes pop and rtv are better than alum for pouring certain things and in some instance's easier to work with.

BTW I got one with 6 .030 vent holes in each cavity and its doesn't fill all the time.The gas (or smoke) that the plastic produces gets trapped and act like air pockets. The other problem you have is that when plastic hits the Alum is cools rather quickly so unless your plastic is extreamly hot it won't fill all cavities.

Hope that makes sense.

Delw

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