ly a most
important matter.

Notice the careless and incompetent workman. If chipping or cutting is
required, he will grasp the first chisel at hand. It may have a curved
end, or be a key-way chisel, or entirely unsuited as to size for the
cutting required.

The result is an injured tool, and unsatisfactory results. The rule
holds good in this respect as with every other tool in the kit. _Use a
tool for the purpose it was made for_, and for no other. Acquire that
habit.

COLD CHISELS.--A cold chisel should never be ground to a long, tapering
point, like a wood chisel. The proper taper for a wood chisel is 15
degrees, whereas a cold chisel should be 45 degrees. A drifting chisel
may have a longer taper than one used for chipping.

It is a good habit, particularly as there are so few tools which require
grinding, to commence the day's work by grinding the chisels, and
arranging them for business.

SYSTEM IN WORK.--Then see to it that the drills are in good shape; and
while you are about it, look over the lathe tools. You will find that it
is better to do this work at one time, than to go to the emery wheel a
dozen times a day while you are engaged on the job.

Adopt a system in your work. Don't take things just as they come along,
but form your plans in an orderly way, and you will always know how to
take up and finish the work in the most profitable and satisfactory way.

WRONG USE OF TOOLS.--Never use the vise as an anvil. Ordinary and proper
use of this tool will insure it for a lifetime, aside from its natural
wear. It may be said with safety that a vise will never break if used
for the purpose for which it was intended. One blow of a hammer may ruin
it.

Furthermore, never use an auxiliary lever to screw up the jaws. If the
lever which comes with it is not large enough to set the jaws, you may
be sure that the vise is not large enough for your work.

CHAPTER III

SETTING AND HOLDING TOOLS

Some simple directions in the holding and setting of tools may be of
service to the novice. Practice has shown the most effective way of
treating different materials, so that the tools will do the most
efficient work.

A tool ground in a certain way and set at a particular angle might do
the work admirably on a piece of steel, but would not possibly work on
aluminum or brass.

LATHE SPEED.--If the lathe should run at the same speed on a piece of
cast iron as with a brass casting, the result would not be ve