[R-390] Pinned Down - advice needed

[Chris Kepus]

Roger,

Thanks for adding the info on the rivet style taper pin.  After receiving
your info, I went back to the shop to examine the pins more closely using a
10X loupe. It now appears that all the pins are hollow, even the ones whose
diameter makes a 1/16 drill shaft look huge! In comparing what I saw on the
McMaster-Carr roll pin / spring pin page, "my" pins look more like spring
pins.

So the good news is that I don't have to worry about a taper pin.  So I am
emailing McMaster-Carr requesting some assistance in the best way to use
their M2/M7 drill rod to drive out a spring pin (the closed gap version of a
roll pin).  I am also stopping by a hobby shop later this week to see what
they have (thanks for the suggestion).  Don't know why I didn't think of
them earlier.  I'm in there at least once a month. 

Again, thanks! 

Chris
W7JPG





----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net]
On Behalf Of Roger Ruszkowski
Sent: Tuesday, June 19, 2012 6:35 PM
To: R-390 at mailman.qth.net
Subject: Re: [R-390] Pinned Down - advice needed


Chris,

>From reading the other replies you should be able to determine if you 
>have
taper pins or roll pins.

A variant on the taper pins is rivet.
The very small diameter taper pin is in fact inserted into the gear and
shaft and then swaged over on the end to keep it from falling out. The taper
holds it one way and the swag holds it from backing out. And both ends will
look to be about the same diameter.

You will need to file the small round rivet looking head off the end of the
pin and punch it out.

Mostly some formal education on the device helps you to know for sure if
this is the design you may have.

Try a Demerol or other hobby grinder on a pin end and see what you get.
Once you get it apart you can then replace the pin.

Looking for small diameter pin punch material, try the piano wire at the
hobby shop.

In addition to the stock drill bits are a whole range of drill bits of small
size.

Visit a good local hardware and ask. Or visit an industrial tool store that
sells bits for lathes and grinding wheels. they will stock these odd
diameter bits.

Roger AI4NI


______________________________________________________________
R-390 mailing list
Home: http://mailman.qth.net/mailman/listinfo/r-390
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:R-390 at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html