Re: [CAD_CAM_EDM_DRO] Re: Leadscrews, PCB router experiment

In a message dated 24-Jul-01 02:21:40 Central Daylight Time,
elson@... writes:

> The experts can tap the shank on their fingernail and listen for the ringing
> of the cantilevered drill bit. If it rings with a very high pitch, close to
> 10 KHz, then it is carbide for sure. HSS is magnetic, of course, but some
> other cutter steels are not.
>

The most OBVIOUS way to tell "in an instant" is to "weigh" the piece in your
delicate fingers! If it is OBVIOUSLY heavier than steel --- like LEAD would
be, only even heavier, yet! --- it is solid-carbide! Dull grey, not shiny,
like HSS.

Carbide is even MORE magnetic than HSS!!! NOT a useful test!


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