To properly regrind thin edge knives, one must have:
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| 1) |
Soft wheels of the proper grit and grade. Alcon uses the
following wheels:
7" x 1/2" x 1 1/4" 32A60 H 8VBE
3500 RPM
8" Cup wheels 32A46 G 8VBE 1800 RPM
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| 2) |
An understanding of the edge one hopes to obtain. When knife edges
are of an included angle of 15º or over, they can be finish ground in one
set-up on each side. When the included angle is less than 15º, it is necessary
to use a sharpening bevel as shown in the sketches, right.
When knife edges are ground paper thin, the material is embrittled and the edge
will chip off. It is important that the edge at the back of the sharpening bevel
be ground to not less than .008". If a thinner edge is required, it must be
obtained by honing.
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| 3) |
Proper back up plates, especially if there is any time limit on the work.
For single bevel knives, the back-up plate is flat.
For double bevel knives the plate must be a cup to support the rim; for otherwise
the knife will deflect away from the wheel and the edge may be cracked or broken
off by the distortion.
All new knives are supported in this manner and an overhang of over 1/32" cannot
be permitted.
Alcon has hundreds of such plates; the end is not in sight; and, we do not know how
their use can be avoided.
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