Plastic Wheel 42x19mm Pair
This white plastic wheel has a black rubber tire measuring 1.65" (42 mm) in diameter and is designed to fit the output shafts (D shape 3mm) on most micro and mini 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.
Overview
This rugged wheel is designed to fit securely on the output shafts of our micro and mini metal gearmotors. These gearmotors should be mounted onto the side of the hub with the protruding teeth, as shown on the picture. The output shaft will slide into the socket easily at first but will achieve a snug fit when pressed through to the other edge of the hub.
The output shafts on the Solarbotics metal gear motors will also fit these wheels, but because they are shorter they will have to be mounted onto the other side of the wheel where the fit is tighter (which means the Solarbotics metal gearmotors will not work with the
quadrature encoder associated with this wheel). These wheels will also work in this orientation on the Pololu 120:1 mini plastic gearmotor 90-degree 3mm D-shaft output.
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| Micro metal gearmotor with plastic wheel 42x19mm and extended bracket. |
Specifications
- Diameter: 1.65" (42 mm)
- Width of tire: 0.75" (19 mm)
- Weight: 0.66 oz (19 g)
Encoder Feedback
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 ourmicro metal gearmotor bracket 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 42x19mm wheels.
The following oscilloscope capture shows the two encoder output channels while the 42x19mm wheel is spinning at close to 630 RPM. The two channels are approximately 90 degree out of phase, allowing you to determine both rotational speed and direction.
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| Oscilloscope capture of encoder outputs with the wheel spinning at 630 RPM. |
Dimensions
| Size: |
42 x 19 mm |
| Weight: |
19 g
1 |
| Shaft diameter: |
3 mm
2 |
General specifications
Notes:
- 1
- Per wheel, including tire.
- 2
- D-shaped hole for press fit onto Pololu micro and mini metal gearmotors.
Dimensions of the plastic wheel 42x19mm hub track set drive sprocket. |
Pololu 5" round robot chassis RRC04A with drive components and encoders mounted on top. |
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Plastic wheel 42x19mm, interior view. |
Plastic wheel 42x19mm with micro metal gearmotor. |
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