May I know what the nailheading is?
May I know what the average number of hits a bit can get before
rehsarpening?  How about in a better case, and a worse case as well.

Richard J. Linn, Ph.D.
Department of Industrial Engineering and Engineering Management
The Hong Kong University of Science and Technology
Clear Water Bay, Kowloon, Hong Kong
Tel: (852) 2358-7096
Fax: (852) 2358-0062
E-mail:    [log in to unmask]

On Tue, 24 Feb 1998, drilbert wrote:

> sam mccorkel wrote:
> >
> > Is there anybody out there that uses Centerline "AT" drill bits?
> >
> > We got a flyer claiming 14,000 hits without resharpening.
> >
> > Curious to see your feedback.
> >
>
> My understanding is you cannot resharpen these.  The point geometry does
> allow a lot more hits than typical.  The rake angle and helix angle
> create a more massive corner, and the point geometry looks like a more
> efficient chip maker to me, better cutting forces, smaller deformation
> zone, so less heat, less wear.  I would guess, that if you don't care
> too much about nailheading, you could get many thousands of hits, but
> 14000?
>

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