[R-390] Pinned Down - advice needed

[Chris Kepus]

Hi Roy,

Thanks for heading me back on track. I was looking at McM-Carr's
Shock-Resistant Air-Hardened S7 Tool Steel but the smallest dia they list is
1/16. Ratz!!  

I ordered a set of 0.6mm, 0.7mm, 0.8mm and 1.0mm watchmakers pin punches
from a Chinese outfit on eBay but they will take some time to get here and
I'm not too confident about the quality of the steel so I thought I'd hedge
my bet and see what I could come up with at McM-Carr.

I'll see where I can find # 78 and 67 wire size bits.

QSL the cautions to support the shaft that I will be beating on. ;-)

Chris - W7JPG







-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net]
On Behalf Of Roy Morgan
Sent: Tuesday, June 19, 2012 11:35 PM
To: R-390-List Serve
Subject: Re: [R-390] Pinned Down - advice needed


On Jun 20, 2012, at 12:54 AM, Chris Kepus wrote:
... the best way to use
> their M2/M7 drill rod to drive out a spring pin

Chris,

Note that most drill rod is NOT hardened: the intent is that the user harden
then temper the rod after forming into the desired tool or whatever.  Spring
pins are usually hardened, and trying to drive it out with a soft steel rod
may bring a bent tool.

You may want to just find a drill the right size and use the non- drilling
end of it.  Start short to get the pin moving.

If I were trying this, I would be careful to not bang on any bearings the
shaft may have: I'd arrange a metal standoff with hole in the center to
support the pinned collar, or some other such thing.

Roy

Roy Morgan
k1lky at earthlink.net
K1LKY Since 1958 - Keep 'em Glowing!



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