[TheForge] New subject, a little tweeking on my LG help please

[Jerry Frost]

Good idea Andy, I hadn't thought of using UHMW plastic to bush the treadle. 
Most everything on the hammer is still pretty snug. I'm thinking the pivot 
on the treadle wore because the last owner used the left side the most. He's 
a production bladesmith as was his father. I'm just happy this hammer has so 
few wear point problems. I don't think I mentioned it before, it's a 50lb 
Little Giant delivered to LA Heavy Hardware 01/17/12. Darned thing still has 
the plow shear dies in it. Matched flat dies are a soon to do project, I'd 
really like to have the edges match up for even shoulders, etc.

Thanks for the help everybody.
----- Original Message ----- 
From: "Andrew Vida" <osan at netlabs.net>
To: "Blacksmithing List Sponsored by ABANA" <theforge at mailman.qth.net>
Sent: Tuesday, June 21, 2011 1:05 PM
Subject: Re: [TheForge] New subject, a little tweeking on my LG help please


>
>
> On 6/20/2011 10:30 PM, Jerry Frost wrote:
>> I've spent some more time with the crow bar narrowing in on the sloppy 
>> point
>> and it is in the treadle at the pivot bolt and the pivot bolt is nice and
>> snug. The rest of the treadle linkage is pretty snug and right for 
>> pushing
>> 100 so I'm thinking I need to unwallow the hole in the left treadle arm 
>> at
>> the pivot. I'm pretty sure the next step is taking it apart a little bit 
>> but
>> we have an annual event coming up this weekend and I need to do some PW 
>> work
>> before the show.
>
> About 10 or more years ago Marshall decided to tune up his 25# Murray.
> We did the job by building a new treadle linkage, installing a brake,
> and rebushing the treadle.  I machined two bushings from some very hard
> and tough nylon stock he had laying around.  I machined them to be
> rather tight and precise (did them on an instrument maker's lathe).
> When I installed them, everything took a dead-blow hammer to assemble.
> It was slight-interference all the way.
>
> I adjusted the gibs neatly, another important step in how well the
> hammer strikes.  To this day that hammer hits like a son of a bitch and
> is precisely controllable.  You can give taps almost not even worth
> mentioning, smack the crap out of the work, or give anything in between
> with very little regulatory effort.  The bushings I made are probably
> the primary reason for the gain in control.  Because they are nylon and
> were built "too tight", they are likely to last an age.
>
> I don't know how much effect re-bushing the treadle on a treadle hammer
> will have, as I have never worked on one that was beat like that.  I
> can, however, imagine that since all the power to the ram is transmitted
> through the treadle, good tight bushings are probably central to the
> hammer's efficiency, much as tightening up the gibs will do for a power
> hammer.
>
> It is difficult to over estimate the value of a good tuning where
> solid-link mechanical hammers are concerned.
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