USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 2/TASK 2
Slide the ferrule towards the cutting edges when removing heavy deposits;
slide it back toward the handle for light scraping.
(3) Using a Bearing Scraper.
Hold the bearing scraper with both
hands, using the hand at the end of the handle to twist, while the other
hand steadies the tool. Use a very light pressure and remove a small amount
of metal with a twisting stroke.
If too much pressure is applied, the
scraper will chatter and leave a rough, uneven surface.
When scraping a
bearing, start at one top side of the bearing cap, go down, then up to the
top of the other side. Do not scrape lengthwise.
d. Precautions.
(1) Keep work, scraper, and hands free from grease and oil when using
a scraper.
(2) When scraping over a surface the second time, scrape
at
a
different angle so that the markings are more easily distinguished.
(3) Keep scrapers sharp at all times (except the carbon scraper) or
they will cause an uneven surface, since increased pressure is required to
make the scraper cut.
(4) Use scrapers only for purposes for which they are intended.
e. Care of Scrapers.
To sharpen a bearing scraper, use an oilstone
with a rounded edge.
Secure or hold the scraper on a bench and rub the
rounded edge of the oilstone on the inside bevel of the hollow ground
scraper blade. Rub the stone back and forth several times. Use a piece of
canvas or leather to remove the wire edge after sharpening.
6.
Punches
a. Purposes. Punches are used to punch holes in metal, leather, paper,
and other materials; to mark metal, drive pins or rivets; to free frozen
pins
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