20
Wheel Cover
The wheel cover attaches to the chopper head with 4 screws. The wheel cover
is made of .030” aluminum with an anti-reflective black anodized coating.
Two concentric slots, etched in both faces of the cover, allow apertures up to .3
and .4-inches wide over most of the chopping wheel surface. The wheel cover
dimensions are 5” x 5” x 0.5”.
The wheel cover is provided for safety. The chopper wheel can cause injury if
it is touched while rotating. This is especially critical if you find yourself
reaching into your optical set-up with the lights off.
The wheel cover is also provided to reduce the generation of stray light that
could interfere with your measurements. The chopper head uses an infrared
sensor to detect chopper wheel motion. The source in this sensor emits energy
in the 870 - 950 nm wavelength range. The wheel cover will greatly reduce
the amount of sensor-radiated IR light picked up by your detector.
To install the wheel cover, first install a wheel on the chopper hub. Then, slide
the wheel cover over the top of the wheel while spreading the 2 mounting
flanges apart enough to avoid contact with the painted motor surface. (The
motor is .060 - .080” wider than the mounting base.) Once the mounting
flanges are lowered past the motor, align one of the 4 flange holes with a
threaded hole in the motor base and loosely attach the cover to the base with
one of the 4-40 x 3/8” mounting screws. Loosely fasten the 3 remaining
screws. Tighten the 4 screws after they are installed.
The cover must be removed to change the chopping wheel. Remove the 4
screws holding the cover to the base. From the motor side of the chopping
wheel, move the cover away from the motor while spreading the mounting
flanges apart. Now slide the cover up over the motor.
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