USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 2/TASK 1
Use a coarse stone to sharpen large and very dull or nicked tools. Use a
medium grain stone to sharpen tools not requiring a finished edge, such as
tools for working soft wood, cloth, leather, and rubber. Use a fine stone
and an oilstone to sharpen and hone tools requiring a razor edge.
f. Care of Grinders.
Keep grinders clean and make certain housing
screws are tight.
Periodically, drain oil from the bench grinder and
regrease the valve grinder. Flush gear housings and gears with the suitable
cleaning solvent.
Refill with the manufacturer's recommended grade of
lubricant.
Remove rust from external surfaces with crocus cloth.
After
use, wipe clean and store in a suitable box or on a rack. Make certain all
nuts, screws, and bolts are tight. For long periods of storage, relubricate
and spread a rust preventive compound on all metal parts. Wrap the grinder
in an oil soaked cloth and store in a dry place.
g. Care of Sharpening Stones and Oilstones.
(1) Cleaning.
Prevent glazing of sharpening stones by applying a
light oil during the use of the stone.
Wipe the stone clean with wiping
cloth or cotton waste after each use. If the stone becomes glazed or gummed
up, clean with aqua ammonia or dry cleaning solvent.
If necessary, scour
with aluminum oxide abrasive cloth or flint paper attached to a flat block.
(2) Dressing. At times, oilstones will become uneven
from improper
use. True the uneven surfaces on an old grinding wheel or on
a grindstone.
Another method is to lap the surface with a block of cast iron
or other hard
material covered with a waterproof abrasive paper, dipping
the stone in
water at regular intervals and continuing the lapping until
the stone is
true.
(3) Repairing. Oilstones are easily broken if they are not handled
carefully. Repair a broken oilstone in the manner described in (a) through
(f) below.
Refer to figure 64 on the following page for the repair
procedure.
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