USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 2/TASK 2
The best included angle for cutting cast iron is about 70; for
tool.
wrought iron and mild steel 60 is preferred.
Chisels used for cutting
extremely hard metal may be ground to 90.
1 Set the grinder tool rest to give the chisel the desired
bevel angle.
2 Hold the chisel (as shown in figure 93) with the left-hand
resting on the tool rest.
FIGURE 93.
GRINDING A COLD CHISEL.
3 Move the chisel slowly back and forth across the face of
the grinding wheel at the desired canted angle.
4 Do not hold the chisel against the wheel with too much
pressure or the temper will be lost due to overheating.
5 Grind the cutting edge slightly convex, as shown in figure
94 on the following page. This is done to prevent the corners of the chisel
from digging into the work.
6 Dip the chisel in water frequently to cool off, preserving
temper.
120
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