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Date: Tue, 01 Jul 2008 12:55:12 -0400
From: Ernest Christley <echristley@nc.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: PSRU oil drain
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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.
>>
>> -- 
>>
>> http://www.ronpaultimeline.com
>>
>>
>>
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