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Re: end mill holder

 

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Hi Peter:

I bought some steel that was too hard to saw. I built a big fire in the back yard and annealed it for hours. When it cooled I could cut it, but it was still tougher than mild steel.

You could heat the chuck to soften it, but it would be best to re harden it and touch up the ground surfaces.

Carl.

On 9/5/2023 12:50 PM, Peter Brooks wrote:

I tried to bore out and thread one of these to M14 x 1 - on a Unimat 3 ! ?They are made of tough stuff. Wrecked an M14 tap, although I had bored it generously.

(BTW surely by definition the minimum tap drill for M14 x 1 would be 13mm? )

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