On 07/30/2019 09:14 PM, Gene Heskett wrote:
Greetings all;
Like Jon said on the sheldon list. woodruff keys cut into a case hardened
shaft are a bear. Carbide makes a mark, for about 5 seconds.
So it appears I will have to dig the keyways by EDM.
Because the electrode will go away too, what makes the longest lasting
electrode material?
And which polarity, if it makes a difference?
I think you want workpiece positive, and either graphite or
copper makes a good electrode.
Unless you do it with a second pass and new electrode, the
slot is likely to get a taper as the electrode wears down.
Jon
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