Re: [CAD_CAM_EDM_DRO] CNC lathe retrofit and phase converter

I'm really surprised to see this info here! It was told to us by the
instructor (now retired) at the college. We had to make a lot of tools but
fortunately making a file wasn't one of them!

Smoke

> >Question #3: (OT)
> >How are file teeth formed?
>
> With a hot chisel and a hammer, allways remembering to chill the chisel
> frequently by dunking it in a bucket of water, so it won't lose it's

hardness.

> When you have enough teeth, let the file blank cool. Press refractory

down into

> the chisel cuts, and smooth it off such that the cutting portions of the

teeth

> are exposed, and let the refractory dry. Heat up the blank to the proper
> temperature, and quench till cool, at least till it doesn't, "smoke", when

you

> pull it out to check. You now have tempered, "hollows", and full hardened
> cutting teeth, i.e., a file.
>
> Bill
>