USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 2/TASK 2
2 Make certain the glass is clean--dirty glass does not cut
well and dulls the cutter.
3 Brush turpentine directly along the line to be cut.
This
keeps the cutter bearings from gumming and keeps the cutter sharp longer.
4 To make a straight cut, use a straightedge to guide the
cutter. A wooden yardstick is ideal, since the wood will not slip as easily
on glass as a metal guide would.
5 Lubricate the cutting wheel with a drop of light machine
oil.
Remove excess oil.
6 Hold the guide with one hand against the glass and hold the
cutter in a vertical position in the other hand. Your forefinger should be
extended along the back of the cutter with the tip of the finger down near
the wheel.
NOTE
The wheel does not cut exactly at the edge of the
guide, but makes the groove about 1/16 inch from it.
Position the guide accordingly.
7 Start the groove at the far end of the guide and draw the
cutter towards you.
The correct pressure is important, since too much
pressure may crack the pane and both too little or too much pressure may
make an unsatisfactory groove. If the correct pressure is applied and the
cutter is drawn towards you at the right speed, the wheel will make a
scratching sound. If the wheel is dull, or too much pressure is applied,
the sound obtained will be more like crunching than scratching.
8 Draw the cutter over the line only once.
If it becomes
necessary to correct an imperfect groove, do not use a new cutter for this
purpose, use an old one. Drawing a sharp cutter over a groove the second
time dulls it.
9 Make a continuous mark all the way from one edge to the
other. If made properly, a slight crack will be visible the complete length
of the mark.
The crack may not extend through from one surface to the
other. It is best seen from the side opposite the mark.
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