06-06-2019, 04:53 AM
That sounds very much like the stuff I have Vinny, although as so often happens the products here are from different manufacturers or go by different names. I bought this stuff a couple of years ago to make soft motor mounts for my phase converter to help quiet it.
It's got a slightly longer cure time than what you mention but the motor mounts have just the sort of consistency that should work well for a mold, flexible enough to pop the parts out once they're cured. I have a pressure can of release agent to go with it. The seller used to be just near where I work but he's moved to a different area, so to get stuff like this is a half-day outing for me. I was glad to find there was enough left for this job. I think I spent close to a hundred bucks for this stuff, the release agent and another small quantity of 2-pack primer that makes the rubber compound adhere to the metal for applications like those motor mounts.
I got my carving finished this afternoon, sprayed it with paint to seal the surface.
So this board of positives is step 1, pouring the rubber over the board to make a set of negatives will be step 2, casting the letter patterns in the soft mold to make the individual positive blanks will be step 3, attaching them to the pattern and ramming the casting sand for a complete negative cavity will be step 4, and pouring the metal for the finished part will be step 5. Plenty of opportunity for things to go wrong along the way. I expect the letters produced at step 3 will need some fettling before attaching to the pattern, it should be easier to tidy up things like internal features- the holes in letters like O, P, B etc- when I can hold them in my hand and pass a needle file through them.
It's got a slightly longer cure time than what you mention but the motor mounts have just the sort of consistency that should work well for a mold, flexible enough to pop the parts out once they're cured. I have a pressure can of release agent to go with it. The seller used to be just near where I work but he's moved to a different area, so to get stuff like this is a half-day outing for me. I was glad to find there was enough left for this job. I think I spent close to a hundred bucks for this stuff, the release agent and another small quantity of 2-pack primer that makes the rubber compound adhere to the metal for applications like those motor mounts.
I got my carving finished this afternoon, sprayed it with paint to seal the surface.
So this board of positives is step 1, pouring the rubber over the board to make a set of negatives will be step 2, casting the letter patterns in the soft mold to make the individual positive blanks will be step 3, attaching them to the pattern and ramming the casting sand for a complete negative cavity will be step 4, and pouring the metal for the finished part will be step 5. Plenty of opportunity for things to go wrong along the way. I expect the letters produced at step 3 will need some fettling before attaching to the pattern, it should be easier to tidy up things like internal features- the holes in letters like O, P, B etc- when I can hold them in my hand and pass a needle file through them.
Lathe (n); a machine tool used in the production of milling machine components.
Milling Machine (n); a machine tool used in the production of lathe components.
Milling Machine (n); a machine tool used in the production of lathe components.