Lenses Off Axis - National Optronics Horizon II Instruction Manual

become imbedded in the surface of the lens. Spraying the Bevel Guide Wheel
with Anti-Static Spray, which can be purchased locally, will remedy any static
build-up. Also, grease on the BGW transferred from lenses can attract dust.
Clean any grease marks off the lenses.
MARKS ON CR-39 LENSES -
A. Dull Cutters. Although heat is not a big concern with CR-39 as with
Polycarbonate, extremely dull cutters can cause this problem.
B. Static Electricity. Static can cause the same problems as with Polycarbonate.
However, with CR-39, if the scratches are not too severe or are mild
aberrations, the lens can often be heated and wiped with a soft lint-free cloth
to remove any plastic dust adhering to the surface of the lens. As noted
above, ensure that the BGW is free of grease.

Lenses Off Axis:

Once set at the factory, adjustments to the mechanical axis setting rarely need to
be made. Before attempting any adjustment, the following steps should be performed
to verify that the axis setting is indeed off. Most perceived axis slippage is NOT the
result of the edger being out of adjustment, but rather the result of LEAP pad flex
from a binding lens clamp, dull cutters or reduced air pressure!
A. Insufficient air pressure. Verify that pressure on the gauge on the right side
of the edger is set at 80 PSI Maximum.
B. Dull Cutters. Check the cutters for dullness in accordance with the
Maintenance Procedure.
C. Binding lens clamp. Check the lens clamp assembly for wear in accordance
with the Maintenance Procedure.
To verify the mechanical axis:
1. Place an Aviator-type pattern on the edger as if to edge a right eye.
2. Using the Pattern Duplicator Adaptor, supplied with the edger, mount a
pattern blank with a true 180 line in the lens chuck.
3. Depress the Rimless Lock switch and edge the pattern blank.
4. Once the cycle is complete, hold the pattern blank in place and release the
Chuck Switch. DO NOT remove the pattern blank.
NATIONAL
INCORPORATED
TROUBLESHOOTING
Tel: 434-295-9126 Tech Support: 800-247-9796 Fax: 888-239-0778
100 Avon Street, P.O. Box 1547
Charlottesville, VA 22902
Revision: 11/98 Page - 34 -