have a part that I need to make a mold of and then re-cast...

anyone on here do this as a business?

We dont but here is a customer of mine who should be able to help.

http://cesfoundry.com/ces.html

You will have to allow for the shrinkage of the original part when casting. So to take a cast part and use it as a mold will result in a smaller part being made off that cast part. If size is not an issue then it is not a problem but you will need to have a cope and drag made as well as the risers and gating.

Different metals shrink at different rates. Aluminum for example is 5/32" of an inch per foot.. Adds up when making a part.

Also you will have to address a core box if your shape has a cavity in it when cast.

Your local foundry or the foundry of choice will have pattern makers they work with.

Curious what type of piece. Not going to be cheap

or these guys.

http://buddybarcasting.com/Home.html