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jewen@comporium.net wrote:
I would set it up in a mill and cut the hole with a solid carbide center cutting end mill. If you want to drill it, I would start small and step up in size, using cobalt steel bits with TiN or TiALN coating. I would not try to hand drill - either a very sturdy stable drill press or a vertical mill.
Well, the cobalt steel bits with the TiN coating doesn't work. Made the 5/32" bit nice and round.
Joe
---- Original message ----
Date: Sun, 29 Jun 2008 22:05:41 -0400
From: Ernest Christley <echristley@nc.rr.com> Subject: [FlyRotary] PSRU oil drain To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
I've got to put an oil drain in my PSRU. I can put a 1/8" hole in, and have it route around the ring gear; but I don't think 1/8" is large enough. I started trying to put a 1/4" hole through the ring gear, but it seems to be harder than the bits I have.
How does one put a hole in the hardened steel, or is 1/8" large enough.
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