Quote:
Originally posted by manny
...The key is to CAST the rotors with the holes, not drill them as an after-thought.
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I've designed automotive castings and even poured them. I can't imagine casting such small holes. Rule of thumb says you have to leave at least 0.060" stock on cast surface for machining, preferably 0.090". That's just too much detail for a sand casting, not even mentioning the required chamfer at the hole's edge critical to reduce cracking from thermal cyclic fatigue.