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Drive GearMotors |
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| Altitude gearmotor, Oriental Motor Co. Vexta brand stepper motors, 2 phase, high torque model PK264-01A, 1.8 deg/step, 5.7 ohm, 1 amp with holding torque of 54.2 oz/in. Sky Tracker Controller output voltage boosted to 18.0 VDC to provide adequate torque to drive larger scope | Internal view altitude gearmotor- Three stage reduction utilizing W.M. Berg "zero backlash" chain belts. Gear box made of ABS plastic to mitigate sound of stepper motor vibration. Noise level just barely audible, even in a "viewing" environment. Both gearmotors use teflon "spacer" pads between the ABS and the plywood to ensure a very smooth "clutching" action. | |
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| The altitude final drive wheel is 1 1/4" OD X 1" wide and made of 65 durometer plastic material | Note larger size last stage drive belt. Idler used to tension final stage belt. All shafts mounted in ball bearings. Final altitude drive ratio is 314.54:1 | |
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| Azimuth gearmotor mounted with clutch motor. Note pivot placement. | Azimuth and altitude gear boxes use same Vexta/Oriental Motor Co. steppers. | |
 The azimuth drive output shaft is tempered steel 3/8" rod. The final drive is a 65 durometer plastic roller 1 1/2" OD X 1" width. The drive roller contacts the groundboard edge which has 00 grit belt sander material laminated to the surface |
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| Expanded view of the azimuth gearbox interior with the 1" OD ball bearings fitted throughout | Center to center shaft positions very critical to avoid use of idlers. The final drive ratio on the azimuth gearmotor is 276.7:1 which provides more than ample torque for smooth operation | |