Investment casting - ACME threads
Investment casting - ACME threads
(OP)
Hello everyone,
I have heard that investment casting can be held to very close tolerances (+/- .005, sometimes tighter). If I have a STUB ACME thread called out in my part. Would they consider casting the thread form and later finish it out or do they cast the blanking dims and then machine the threads in a Lathe.
Thanks in advance for the replies
I have heard that investment casting can be held to very close tolerances (+/- .005, sometimes tighter). If I have a STUB ACME thread called out in my part. Would they consider casting the thread form and later finish it out or do they cast the blanking dims and then machine the threads in a Lathe.
Thanks in advance for the replies





RE: Investment casting - ACME threads
Save water Drink Beer
RE: Investment casting - ACME threads
Development Engineer
Oilfield Industry
RE: Investment casting - ACME threads
RE: Investment casting - ACME threads
RE: Investment casting - ACME threads
This part has a number of features and the STUB ACME threads are just one of them. We are trying to reduce the overall mfg cost by considering casting options.The part will have to be finished anyway because it has some sealing surfaces.
Development Engineer
Oilfield Industry
RE: Investment casting - ACME threads
I like to case harden by liquid nitration afterwards also. This gives me a nice hard finish and prevents thread pick-up in the mating part. On the print, specify "remove sharp edge from flanks of thread", that way the machinist will debur the sharp lip for you. If you thread roll, no worries on this.
Good luck with it.
Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada