
Tips and Tricks to
Polishing Hardened Cores?
Question:
We are a molder of medical parts and we also run a couple of lens molds. We have been unsuccessful in our attempts to polish (to an A1 finish) the hardened cores in these molds. They look great coming out of the shop, but soon seem to develop minute scratches quickly. We have tried several polishing techniques with different stones, diamond compounds etc., with varying degrees of success. Could you recommend a book or know of some kind of literature that would help our toolmakers understand the tricks of this trade?
Answer:
Polishing is definitely an art that cannot be learned through reading books. You might get started that way, but it is imperative to be able to see – microscopically – the effects the different grits have on different types and hardness’s of steels. Also, the feel of the steel as you work it and the exact recipe of stones, paper, compounds and hand pressure must be learned the old fashioned way – by doing it – with the instruction of a master polisher.
Our recommendation to you is that you should consult with a trusted moldmaker who may have the resources and experience to assist you. If that is not an option, or if that top moldmaker is just as puzzled, then the next step is to turn to a professional polishing source that can either do the polishing for you or recommend the use of a particular treatment or mold coating that will help you achieve your desired results. If you don’t have a preferred polishing vendor, we can recommend
Bales Mold Service, a company that specializes in A1 diamond polishing and mold coatings. Contact them at 800-215-MOLD and they will take a look.