Re: Making machinist metalworking files

have you ever seen the original machines they used to use for making files?
hard to describe, but in its most basic sense all it was is a jig to hold
the file material, and something very similar to a cold chisel held by an
arm at a set angle and the arm indexed to move along at the same step each
time, or sometimes with the arm fixed and the file material moving along at
an indexed distance. Strike the chisel, move the arm forward one step,
repeat, temper

Shaun

"Brian Lawson" <lawsonb@xxxxxxxxxxxx> wrote in message
news:9ssm63da9rdg0up6pv91s5f222ntg2e4q6@xxxxxxxxxx
Hey Rashid,

Good stuff. You should submit that as an article to one of the
magazines.

Take care.

Brian Lawson,
Bothwell, Ontario.
XXXXXXXXXXXXXXXXXXXXXXXX
On Fri, 08 Jun 2007 14:32:49 -0000, rashid111
<rashid.karimov@xxxxxxxxx> wrote:

Folx,

I needed some wide (2"+), slim (1/8" and 3/32) files to file narrow
slots in 7075 Al. As nothing like
that is commercially available, I made my own.

Tilted mini-mill's head to about 30 degrees and with 3/8 4Fl EM, cut
grooves about .030 deep,
spaced with .030. The grove is cut in Y and then the table was
advanced the .030 in X. Repeat
till it hurtZ.

Pretty tiring :), but the results are most excellent. The files _eat_
that Al like nothing else.
Single cut, at an angle - I used same angle as on some "factory"
files I had.


I used A2 and didn't temper @ all, for max RC. Strips were held by
magnetic chuck.
After HT, there's no warpage of any sort. I use "plate-quench", an
invention from knife
making community - after the foil-wrapped steel is removed from the
1750F (for A2) inferno, it
is laid flat onto a massive steel/Al plate, and then another plate is
laid on top of it. It cools
it 20 times faster than the air (as the steel will quench almost as
good in still air, there's no
benefit from it) and most importantly keeps the piece flat as it
cools.

Figure some1 might need something like that one of these days and it
is perfectly doable in
home shop conditions.


.

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