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Re: Sextant repair
From: Bill Noyce
Date: 2006 Mar 21, 13:37 -0500
From: Bill Noyce
Date: 2006 Mar 21, 13:37 -0500
Could it be that a prior owner tried to force a 2-56 screw into a hole that
really wants a metric screw? Maybe M2.5, which has 0.45 mm between
threads, according to
http://www.accuratescrew.com/info/MetricSizes.htm#threads
Just a guess...
-- Bill
On 3/20/06, Philip Lange wrote:
> To the list.
> I have a not so old, 1968 , C.Plath sextant that I am trying to restore.
> The thread that secures the pivot arm to the frame is buggered and needs a
> to be chased. Trouble is I can not determine the proper thread. The screw
> measures .089 +- (2.26 mm) in dia and I have counted and calculated 56 tpi.
> (Measured by a caliper not a mike. Could be a little off.) The closest I
> can find is a #2 56, but I doubt this as it is of German manufacture and I
> suspect the thread is metric. I would buy a tap if I knew the right thread.
>
> Watch and clock makers are not to be found in this neighborhood.
>
> I know this is off the wall, but, can any one help me ?
>
> Thanks
>
> Philip
>
>
>
>
>
>
> Philip & Marilyn Lange
> AE4OV & KD4JRC,
> S/V ORYOKI
> Witness 35 Catamaran
> http://www.oryoki.net
>
>
