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My experience with drilling SS allen head bolts. My oil pan bolts are SS socket heads. I had the best results starting the holes with a HSS bit, then finish with a cobalt. Since the hole is being started on a round surface the narrow 1/16 bit tends to walk. The HSS bit will tend to cut with a lighter pressure than a cobalt, reducing the incidence of walking. Once the hole is started (dimple) I would finish the hole with a cobalt, when you good pressure can be applied and the cobalt cuts better and lasts longer. FWIW, my experience.
Joe
---- Original message ----
Date: Wed, 30 Jul 2008 15:57:00 +0000
From: "Kelly Troyer" <keltro@att.net> Subject: [FlyRotary] Re: Safety wire To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Keith,
If you use "Allen Head" bolts they are much
easier to drill the small sizes as they
have a round head........IMHO !!.
--
Kelly Troyer
"Dyke Delta"_13B ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifold
-------------- Original message from John Slade
<sladerj@sbcglobal.net>: --------------
> I think I got them from NAPA
>
> ktradcliff@comcast.net wrote:
> > Hey John,
> > > Where did you get pre-drilled bolts for your
oil pan? I am very afraid to
> drill bolts this small.
> >
> > Keith
> >
>
>
> --
> Homepage: http://www.flyrotary.com/
> Archive and UnSub:
http://mail.lancaironline.net:81/lists/flyrotary/List.html
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