[pianotech] Of Chisels

[David Love]

Now I recall, the guys at Steinway used to make chisels for bridge notching out of old files.


David Love
www.davidlovepianos.com

-----Original Message-----
From: Les Koltvedt <t4348lk at yahoo.com>
Sender: pianotech-bounces at ptg.org
Date: Mon, 11 Oct 2010 15:14:59 
To: <pianotech at ptg.org>
Reply-To: pianotech at ptg.org
Subject: Re: [pianotech] Of Chisels

Nice job, next thing you know, you'll be spending Sundays making files.



Date: Mon, 11 Oct 2010 13:36:38 -0500
From: Ron Nossaman <rnossaman at cox.net>
To: pianotech at ptg.org
Subject: Re: [pianotech] Of Chisels
Message-ID: <4CB35936.9000309 at cox.net>
Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"


With all this talk of chisels, it occurred to me that I had some tool 
steel in a drawer in the shop that has been intended for future chisels 
or lathe tools for years. So I grabbed one that says 1/4 X 1/2 X 6, 
M0-Max, from Cleveland Steel. This is, I think, good old M2 
tungsten-molybdenum high speed steel. The stuff they make taps and such 
out of. I spent a half hour or so at the bench grinder, establishing a 
bevel, shaped a tang with an angle grinder, and drove it into a fairly 
funky handle that had also been in a drawer for some years. I did make a 
ferrel for the handle from a plated brass towel bar, which de-funked the 
handle a point or two. I then dug out a recently acquired paring chisel 
that I hadn't yet tuned up, and got out the stones. I wanted to compare 
how they worked on the stones. I coarse flattened both backs quickly on 
the (steel) back of one of my old worn out diamond stones, with a pinch 
of 80 grit silicon carbide and water. The sound and feel were 
considerably different between the two blades. The M2 was noisier 
grinding, and cut slower. Finished up the backs on a coarse diamond 
stone. Sharpened with coarse, then fine, then a razor stone, then 
stropped. Both cut my laminated bridge cap well, but I expect the shop 
made will be more durable. Anyway, I have one to play with now, and got 
a couple of hours' entertainment out of a slow Sunday afternoon.



      
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