Re: Brake drum query
Posted by: SSsssteamer
Date: June 16, 2016 09:36PM
Jeff and Rolly, When making my brake drum pattern, What percentage of shrinkage for Ductile iron 85-55-06 should I allow for? and.... Allowing for warpage and finishing in the pattern too, how much larger and smaller should I allow in the pattern for that? Internet says: "The shrinkage allowance will be different for different metals. The shrinkage allowance is greater for cast steel than that of other alloys. The shrinkage of the metal mainly depends on the metal or alloys to be cast, dimensions of casting, moulding conditions, pouring temperature etc., The shrinkage allowance is always added along the length than along the diameter." My machinist handbook says for cast iron: to allow 1/8" per foot for shrinkage.
Edited 1 time(s). Last edit at 06/16/2016 10:30PM by SSsssteamer.