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Jerry,
Your local machine tool provider will have "adjustable
reamers". You can get one near the size you need and adjust it precisely
with an Allen key. You'll need a 0-1" micrometer or vernier to measure the
reamer after the adjustment.
I used to use an adjustable boring bar to make holes to
+- a couple "tenths"... (.0002). It can be done. You have to
be patient and "sneak up on it"...
Jack
----- Original Message -----
Sent: Thursday, June 30, 2005 11:02 AM
Subject: [FlyRotary] Re: Machining help needed
George,
I have to disagree with your
observation. The boring
tool, by itself will not yield a surface
appropriate for
seating the injector o-ring (and easy removal for
service).
It will have to be followed by honing or reaming. And
most
(inexpensive) boring tools are difficult to adjust to +/-
0.001.
Jerry's best (& least expensive) bet
is to have a standard
size reamer ground down to his target
size.
Regards,
Dale R.
> From: "George Lendich" <lendich@optusnet.com.au>
>
Date: 2005/06/30 Thu AM 02:47:09 EDT
> To: "Rotary motors in aircraft"
<flyrotary@lancaironline.net>
>
Subject: [FlyRotary] Re: Machining help needed
>
> Jerry,
>
The boring tool should be very accurate - provided your using a mill and
>
holding the job very securely.
> George ( down under)
>
>
> I need to find someone to finish the bores on my injector bosses or
>
> tell me how to do it. Final i.d.should be .540 to .545
in. The
> > bosses are .45 in high and are bored and
reamed to .5312. Material is
> > 6061. I tried using
a boring bar but could not maintain the
> > tolerances. I bought
adjustable hand reamers but they were not the
> > right tool for the
job. I considered trying to sand the bore to the
> > correct size
using a flapper but have not tried it yet. Suggestions?
> >
Volunteers? Jerry
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