Re: Sharpening geometric chasers?
- From: George <george@xxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Thu, 17 Nov 2005 00:19:45 -0600
clannorm@xxxxxxxxx wrote:
> We have several sets needing sharpening. Previously they just bought
>new ones when they were dull but this doesn't make sense if we can get
>them sharpened relativly cheap. What we have are 8-32, 10-32, and
>6-32. The only place around here(Arkansas) that did it no longer does
>them so besides an idea of the cost I'm looking for some suggestions as
>to where to send them and maybe how long it takes to get them done.
> I've heard there is a fixture you can buy and do it your self.
>Anybody know anything about this? I have a surface grinder and can
>grind radiuses on the wheel.
>Ken
To some extent you can resharpen chasers if they are not too worn. On
Geometric Chasers the leading edge is a flat surface that is usually
about halfway down the thickness of the chaser. Simply line the
chasers up and regrind that surface in one pass.
You will lose some of the depth since the cutting teeth are tapered
back. You will also lose some of the depth because you have defined a
new cutting surface that is not on center with the work, however a
Geometric Die Head usually has about 0.050" of adjustment so in all
likelihood you can readjust for the small loss.
Obviously the method is limited to one or two regrinds. When you
regrind, you want to create a slight positive rake to the teeth. If
they started with a positive rake (common on small sizes), then you
want to increase it to ensure that the cutting points are cutting and
not pushing.
If you've broken some of the teeth it probably doesn't matter. If
you've broken a lot of teeth or if the wear is significant, then you
might be able to reclaim the chasers by first grinding the teeth down
and then recreating them. When you grind them down, don't grind them
off completely, just grind them down the minimum that you can get away
with. You can then use the stubs to realign the blanks and reform the
cutting teeth - remember that each chaser is offset by 1/4 thread (on
a 4-chaser head).
.
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- Sharpening geometric chasers?
- From: clannorm
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