[Coley]

I use an original for the dimensions and then eurethane plastic to make cores for the inside cavities.

Plaster hold the cores while I glue them togehter.  A copy of the original stand goes into another plaster mold.  I then use a oil and sand mixture to make a copy of the outside of the stand.

I put the cores into the mold and close it and clamp it shut.

Then pour 750 degree ZA alloy into the mold.  After cooling for 5 minutes, I open it up and waalaa, another '35/36 RH stand.

The making of the 1933/4 stand is much more difficult, but done the same way.

[TFoch]

Greg,
Very interesting process. Thanks for posting.
Tom

[EDNY]

Greg

Always was interested in how you craftsman made these parts.  Making them in plastic is one thing..but metal is another challenge all together.

Thanks for sharing

Ed

[themoose]

Greg
Thanks for you post. I found it to be very interesting.  Do you have any examples of the lost wax process that you mentioned ? I would assume that you would use that process for more intricately detailed items.
Moose

[chopper526]

Very cool, Greg. Thanks!

[Coley]

The most difficult part that I ever made in the investment process, was a generator housing for an old firetruck for a gentleman in Oklahoma.

I never did find out what the truck was, but the housing was the brush support end frame.

It also held the gear driven distributor, plus another drive off the rear end of it, possibly a tachometer.

The mold consisted of 14 internal pieces (inserts) to create the housing.

One picture shows a small boss for a small shaft.

The mold took 2 weeks to make as the old part had pieces falling off of it.

I had to JB Weld the parts back in and make up for what was missing.

I made 2 for the customer and one for me.  I now have a similar generator housing to do for a gentleman in PA, but it is a little smaller.

Making this in wax involved only making it ready for wax.  The next one will be very much more involved as I need to make the inserts out of plaster or urethane, then make a mold of each one of them so I can reproduce each one in NO-Bake sand .

Here are the pictures:

[themoose]

Greg......That's some amazing craftsmanship. Thanks

Moose