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12mm Hex Hub (pair)
Price: $10.00
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Availability: Available
Machine Lab Item #: hexhub -

12mm hex hubs for the ML-30 / ML-50 motors.There is a 6 mm hole in one side with set screw for the ML-30 or ML-50 motor shaft and an 8-32 tapped hole in the other side to retain the wheel. Wheels and tires sold separately. Sold in pairs. ML-hexhub

Ball Caster with 3/4in. Plastic Ball
Price: $4.99
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Availability: In Stock
Pololu Item #: 954 -

This ball caster kit includes a black ABS housing, a 3/4in. diameter plastic ball, three dowel pin rollers, two spacers (1/16in. and 1/8in. thick), and two #2 screw sets.The total height of this ball caster is 0.91in. with no spacers. You can also adjust the height to 1.1in. by adding the spacers.The ball caster can be mounted to a chassis by the two screw sets included in the kit. The distance between the two screw holes is 0.24in.0-PL954

Ball Caster with 3/8in. Plastic Ball
Price: $2.99
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Availability: In Stock
Pololu Item #: 950 -

This ball caster kit includes a black ABS housing, a 3/8in. diameter plastic ball, two spacers (1/16in. and 1/8in. thick), and two #2 screw sets.The total height of this ball caster is 0.4in. with no spacers. You can also adjust the height to 0.6in. by adding the spacers.The ball caster can be mounted to a chassis by the two screw sets included in the kit. The distance between the two screw holes is 0.53in.0-PL950

Pololu Wheel 42 x 19mm - Set of Two
Price: $6.98
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Availability: Back Order
Pololu Item #: 1090 -

These custom-designed plastic wheels have rubber tires measuring 1.65" (42 mm) in diameter and are designed to fit the output shafts on our micro and mini metal gearmotors. Our extended micro metal gearmotor bracket is specifically designed to work with these wheels. Please note that the non-extended version of our mountingbracket will not work well with these wheels.SpecsDiameter: 1.65in (42mm)Width of Tire: 0.75in (19mm)Weight: 0.55oz (16g)Motor not included.0-PL1090 ...

Replacement 3pi Ball Caster with 1/2in. Plastic Ball
Retail: $2.99
Price: $1.69
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Availability: In Stock
Pololu Item #: 957 -

This ball caster can be used as a replacement 3pi robot part or as a general-purpose ball caster. When mounted through a hole in a chassis that uses micro metal gearmotors and 32x7mm wheels, as on the 3pi, this ball caster is just the right height to keep the chassis level. The hole for this ball caster in the 3pi chassis has a diameter of 600 mils (0.6") and has a side that is flattened by 30 mils.Replacing the 3pi Ball CasterTo replace the ball caster on your 3pi, you will need to unscrew...