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Now back to our belt grinder and a slightly dull
220 grit belt running at
22.5 m/s.
The purpose of this step is to remove any warpage
after heat treatment, to align the small flats running
along the top edge of the blade, to thin out the
cutting edge if necessary, to remove all deeper
grind lines left before hardening, you should notice
that the 220 grit belt now tends to sand a finer
scratch pattern on the hardened blade. |
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The blade at this stage, do not start each pass
over the contact wheel right at the ricasso but
rather a little distance from it, to prevent unintentionally
reshaping the shoulder grind altogether. |
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Track your 220 grit belt off the edge of the contact
wheel 1 to 2 mm and true up the shoulder grind.
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The blade should now be ready for finer sanding
using grits 400, 800, and 1200 (dry sand only).
The quality of the paper you select to use will
not doubt determine the quality of your finish,
a number of the major brands and most no-name brands
have proved totally unsuccessful so you need to
select carefully. I use "Gelva Achilles Abrasives"
(230 x 280mm) made in Holland, available from Lukas
Abrasives South Africa. |
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My first machine (a touchy point) still going after
all these years, I started building its "hi-tech"
replacement about 5 years ago but haven't had the
heart to finish assembling it and retiring my old
faithfully, maybe in the New Year.
The point is you need a contact wheel that is driven
by a v-belt and runs at ±950 r.p.m. - most
are driven by the abrasive belt and we won't be
using these in the final finishing - you may have
to make a plan. |
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