This custom-designed white plastic wheel has a rubber tire measuring 42 mm in diameter and is designed to fit the output shafts on our micro and 15.5D metal gearmotors as well as the Solarbotics metal gear motors.
Teeth on the hub optionally allow a reflectance sensor to be used for encoder feedback. These wheels are sold in pairs.
Pololu wheel 42×19mm with micro metal gearmotor.
Our extended micro metal gearmotor bracket is specifically designed to work with this wheel. Please note that the non-extended version of our mounting bracket (product #989) will not work well with this wheel.
Micro metal gearmotor with Pololu wheel 42×19mm and extended bracket.
The hub has twelve teeth, each 3 mm wide and separated from its neighbors by 3 mm gaps. We offer a quadrature encoder that uses these teeth to provide up to 48 counts per revolution (a linear resolution of just under 3 mm or 1/8"). The encoder is designed to work with our extended micro metal gearmotor bracket and our micro metal gearmotors as shown in the pictures below. The compact layout of the board fits all of the components within the envelope of the hub and tire, allowing the board to be mounted between the motor and a chassis. The encoder can be purchased as an individual unit or as a part of an encoder set that includes two encoders, a pair of extended brackets, and a pair of 42×19mm wheels.
Encoder for Pololu wheel 42×19mm with wheel, motor, and bracket.
The following oscilloscope capture shows the two encoder output channels while the 42×19mm wheel is spinning at close to 630 RPM. The two channels are approximately 90° out of phase, allowing you to determine both rotational speed and direction.
Oscilloscope capture of encoder outputs with the wheel spinning at 630 RPM.
Diameter: 42 mm
Width of tire: 19 mm
Weight: 19 grame/buc
Shaft diameter: 3 mm (D-shaped hole for press fit onto Pololu micro and mini metal gearmotors)
Dimensions of the Pololu wheel 42×19mm hub/Pololu track set drive sprocket.
Pololu wheel 42×19mm, interior view.