iOptron GEM28 User Manual

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If the motor stalls or the mount does not tracking smoothly, most likely the meshing is too tight. You
may loosen it by about 1/8 turn (or less for tracking).
Tighten the set screw in the small hole to LOCK the gear screw (important) before test the
mount.
Adjust again if needed, but no more than ¼ turn in total.
If you feel there is free play between the worm and gear, you may tighten the meshing adjustment
plunger to eliminate it.
To Adjust RA Gear:
The RA gear meshing adjustment plunger is located next to the RA Gear Switch. The adjustment is
same as that for DEC gear/worm.
DO NOT over tighten the gear meshing adjustment plunger to avoid damage it.
3mm
5mm

iOptron GEM28 Specifications

General

Payload Capacity	28 lbs (12.7 kg)
Mount Weight	10.4 lbs (4.7 kg)
RA Worm Gear Material	Brass
DEC Worm Gear Material	Brass
Tracking Rate	Sidereal, Lunar, Solar
Autoguiding Port	Yes
Communication Port	USB
Tracking Accuracy	± 5 arcsec
Weight	10.4 lbs (4.7 kg)
Mount Type	Equatorial
RA Worm Wheel	180 teeth
DEC Worm Wheel	180 teeth
Motor Drive	Stepper motor
Power Requirement	12V DC
GPS	Built-in
Polar Scope	Yes, included
Counterweight Shaft	Ø20 mm
Worm Gear Period	600 seconds