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RC helicopter parts, all modulus 0.3M

Gear diameter = (number of teeth +2)*modulus

Model: 71A
Material: Copper
Number of teeth: 7
Diameter: 3mm
Bore diameter: 0.95mm (tightly fit to motor shaft with 1mm diameter)

Model: 702A
Material: Plastic
Number of teeth: 70
Diameter: 21.6mm
Bore: 1.95mm (tightly fit to motor shaft with 2mm diameter)

Model: 701A
Material: Plastic
Number of teeth: 70
Diameter: 21.6mm
Bore: 0.95mm hole, (tightly fit to motor shaft with 1mm diameter)

 

Installation Tips:
(1) When installing this pinion gear, be sure to press the rear cover of the hollow cup motor to avoid the accident of the motor cover being pushed out by the shaft; therefore, the hole is small, and it is possible to use too much force to cause the gear to fly out, so be sure to find a place where there is little debris and open and tidy place to do the installation, so that even if the gear flew out, it can be recovered.

(2) When installing the copper gear (tight-fitting type), gently tap the rear cover of the motor while holding it against the cover.