[R-390] Pinned Down - advice needed

[rbethman]

Chris,

Roll pins are hollow.  They are called roll pins since they are made by 
a machine that rolls them to form them.  Straight solid pins have 
rounded ends.  Tapered pins will have a different diameter on each end, 
and will "normally" have rounded ends also.

To determine if they are tapered, do you or one of your friends have a 
dial or digital caliper?  It would tell, if accurate down to 0.0005".

Bob - N0DGN

On 6/19/2012 5:06 PM, Charles P. Steinmetz wrote:
> Chris wrote:
>
>> On the PTO gear train, the pin diameters are estimated (a 1/16 drill
>> bit shank is too large) at 3/64" and and 1/32".  I checked all the
>> links provided and the thinnest diameter pin punch I could find is 1/16".
> Look harder.  I have pin punches down to 0.5 mm (~0.02", or
> 1/50").  You are looking for watch or camera tools, not standard
> machinist's tools.
>
>> My ham radio breakfast group, who saw the PTO, pins and all, up
>> close this AM, was quite surprised by the diminutive size of the
>> pins. The consensus at the table was either live with it or try to
>> drill them out.
> Pins are made to come out (by pressing, not by hammering), and if you
> slow down a minute and approach the task rationally, you will be able
> to figure out how to remove them without drilling or other ham-handed
> foolery.  If they are solid, they may be taper pins (i.e., they come
> out only one way).  If they are roll pins, they should come out
> either way (they often have a distinct bevel on one end for starting,
> which would tell you which way they were inserted -- but some are
> beveled on both ends).
>
> Best regards,
>
> Charles
>