On Tue, 23 Apr 2013 12:57:20 -0500, Richard
wrote:

On 4/24/2013 12:48 AM, Gunner Asch wrote:
On Tue, 23 Apr 2013 08:41:46 -0500,
wrote:

On 4/23/2013 7:57 PM, Gunner Asch wrote:
Fella brought over a gun part for a Marlin lever action..he was
missing a pin..so I made one up for him and installed it..and as I was
inspecting it..I noticed a rather serious crack starting to develop at
one end of the sintered metal part. I fixed it by using my tig torch
and silver bearing flux..I packed the crack full of the heavy green
flux and zapped it with the tig..sealed it up well enough and I put a
slight layer over the area of the crack. After polishing it up with a
fine wire wheel, it looked good. But...is it?

How well does this sort of thing work with sintered metal parts?

Should I warn the guy to buy a new Widget? (Marlin just closed their
doors...so parts may become hard to find)

Any suggestions for other similar fixs with sintered metal parts?

Gunner



Which part?

Better link

http://www.urban-armory.com/diagrams/mar1894.gif

Part #8, 9, and 10 (and 11)

He was missing the #10 pin..and I turned, annealed, replaced it and
peened it into place gently.

Gunner



Why do I get the impression that the rifle has been overstressed?
Repeatedly.


Its a lever action 357 Mag...I dought it could be overstressed very
much.

Sintered metal parts...dont have a sterling track record.....in some
cases. Particularly those that take "impact"/high loading

They work well enough for static loads...the Buck folder in my
pocket..the brass frame..is powdered metal sintering..but it never has
a sudden high stress loading.

A lot of motorcycle brake disks are sintered. But they dont get hit.


Gunner