USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 2/TASK 2
10 To part the glass, slide the pane over to the edge of the
bench or table so that the score mark is parallel to and projecting about
1/8 inch beyond the edge. Hold down the portion resting on the table with
one hand and grasp the projecting end between the fingertips and palm of the
other hand. Apply a light pressure and the glass will part.
11 To part a narrow section of glass, slip a notch in the
cutter head over the projecting end of the glass pane and apply pressure to
twist the projecting end down and in towards the bench.
A grooved wood
block can also be used to make a clean break along the score mark.
(b) Plate or Double Light Glass.
1 Plate glass or double light
glass will part along the
scored line most easily and accurately if a
continuous crack is started
along the bottom of the groove or the scratch.
A sharp cutter and the right
pressure will usually start this crack when the
groove is scored.
2 If the crack does not appear, it can generally be started
by turning the pane over and tapping against the unscored surface with the
end of the cutter handle. Tap directly over the line scored on the opposite
side. A crack which is not continuous can be extended all the way along the
groove by tapping in this manner.
(c) Cutting Glass to a Pattern. First lay out a full size drawing
on paper, making certain the outline is heavy and distinct.
Place the
drawing under the pane of glass. Cut circles, ovals, and curves by tracing
them through the glass with the cutter wheel.
For straight lines, use a
guide such as a woodstrip or a yardstick.
(2) Cutting Glass Tubing and Rod.
Cut glass tubing by nicking it
with a triangular file. Hold the tubing in both hands and apply pressure as
if to bend the tube. The nick must be on the surface away from you. The
tube will crack apart at the nick. Glass rods are cut in the same manner.
In cutting large diameter glass tubing or large diameter glass rods, the
nick made with the triangular file should be a continuous scratch, extending
all around and circling the tubing or rod.
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