Full Product Manual

14
Drilling
When drilling Plexiglas
®
acrylic sheet, best results will be
obtained using standard twist drills that have been modified, as
described below. High-speed steel drills should be used.
Specially ground drills for Plexiglas
®
acrylic sheet are available
from Authorized Plastic Products Distributors.
Modification of Drills:
Instructions for Sharpening Bits
Chuck the bit in an electric drill. Insert the bit through a wood
or metal bushing clamped to the support rest of an abrasive
wheel. The bushing must be clamped so that an approximately
60° total included angle is ground on the bit. With the electric
drill operating, insert the bit through the bushing so that it contacts
the face of the rotating abrasive wheel, thus grinding a conical
point on the bit. See Figure 8A, at right. Remove the bit from
the chuck.
Using the side of the rotating abrasive wheel, grind a 0° rake
angle on each of the cutting edges. This provides a scraping
action rather than a cutting action. See Figure 8B, right.
Then, using the face of the rotating abrasive wheel, grind a
clearance behind each of the cutting edges of about 8° to 12°.
Do not touch the cutting edges. See Figure 8C, right.
The resultant bit will produce good-quality surfaced holes in
Plexiglas
®
acrylic sheet, and will eliminate the problem of the bottom
surface breaking out when the holes are drilled. Pickup of masking
paper adhesive will also be eliminated.
Fixture
Template
Overhead
Air Cylinders
Clamp Work
Template
Plexiglas
®
Acrylic Sheet
Work Table
Portable Router
TABLE ROUTER (Wood Shaper)
WITHOUT TEMPLATE
Ball Bearing
Guiding on
Plexiglas
®
Acrylic Sheet
Router Cutter
with Pilot
WITH TEMPLATE
Flange Trimming Table Router
Trimming with a Portable Router
FIGURE 6
FIGURE 7