Straight line cutting of plastics
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The next time you need to cut a straight
edge on a piece of plastic, try the snap-cut approach.
First, you'll need to find yourself a plastic scoring knife.
Most look a lot like a utility knife…with a hooked tip…and
they're readily available at most hardware stores or home
centers for around $6 or $7.
STEP 1: Start by using a straightedge and a scoring knife
to score your line on the UNDER-SIDE of your plastic.
STEP 2-A: If it's a small workpiece, clamp it into a vise
having jaws that are at least as wide as your piece of plastic.
Be sure your score line is AWAY from you and visible, just
ABOVE the top of your vise jaws…then pull the non-clamped
top of your plastic firmly and quickly TOWARD you, snapping
the piece in two.
STEP 2-B: If it's a large workpiece, begin with STEP 1, above.
Next, lay your workpiece on the shop floor with the score
line on the UNDER-SIDE. Place a RIGID, straight-edged board
or piece of heavy gauge steel on top of your workpiece, at
the score line.
Stand on top of your straightedge…bend over and firmly grasp
the opposite edge of your workpiece and pull up on it briskly,
snapping your workpiece at the score line.