Thanks for the polymer tips, I will try them. I have never tried RTV Molds.
Maybe I will give them a shot. I have a pressure washer that hooks to my
air compressor, will this work? Which is best, pressure washing or
ultrasonic, I have both.
The Gorton 3U is not a 3d machine but 2d. The one I have is from the late
40’s. A P1-2 would be more desirable (newer design, and easier and cheaper
to rebuild if necessary), but I have not run into one of those. The 3U goes
down to 16:1 and runs at up to 20,000 rpm. These old machines are truly
incredible, and Gorton is still in business. I needed a collet and collet
nut, and they carry them. They aren’t cheap but I got them. There is a
fellow named Warren there, he is very helpful.
The Pries CG-21 cutter grinder is only about 13 lbs (I was told it is
called a “Mickey Mouse” in the trade). I got it from the Surplus Corner. It
is slightly less accurate as its larger cousins and does not have as much
power. As I understand it, it was developed as a less expensive alternative
to the larger capacity, more accurate, more expensive machines on the
market at the time. Preis is no longer in business. I figure, that since I
am not working for NASA it should work fine for my needs. I have both HSS
and carbide cutters. I just got everything into place about the time I had
to start doing outdoor festivals. So I have not gotten to start working on
a project yet. Very soon though.
Do you know of a good source for the photopolymer material. The only
sources I know of run about $22.00 for 7" X 7".
What type of brass should I use for injection molds? How thick?
Do you have experience with the high pressure plastic injectors?
How much draft does one need to have on metal injection molds for wax
Thanks for the info on Les Williams, I’ll give him a call. I hope he
doesn’t mind answering a few hundred questions. I’ll try to only ask a few
at a time.
Thanks again for your help. When I get some experience under my belt I’ll
let you know what I think of the Pries cutter grinder. At this point my
problem is lack of knowledge and inexperience with engraving. There is a
listing for some pantographs in the current Engraver’s Journal. I think I
saw an ad in one of the internet classifieds for a Gorton 3D machine. If
your interested I’ll look them up for you.