Innovative iBIT RACER, Activity Booklet

Page: 15 / 92

Programmable robot with micro:bit 
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15
1.6 Mechnical part features
1.6.1 Aluminum wheels and Silicone Tire set
This is good traction wheel and tires. The wheel’s inside aluminum rim is processed
at CNC lathes. Better for 2 wheeled robots. Also suitable for fast line follower robots.
These are features of the wheels :
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Weight is 22 grams.
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Wheel rim accepts 12mm, 15mm and 16mm diameter micro metal gearbox
motors. Center hole is drilled to 3mm (Which is very common shaft for miniature
gearmotors)
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It has an M4 set screw inside, so It holds motor's shaft mechanically and firmly.
The kit includes 2 pairs of the wheel and silicone tire (any color), socket screws
and an Allen wrench.
1.6.2 Plastic ball caster set
This ball caster kit includes a black ABS housing, a 3/8 inch diameter plastic ball,
two of 3mm. thick spacers and two 2x20mm. screw sets. The total height of the ball
caster, 0.4 inch, can be increased to about 0.6 inch using the included spacers. The two
included 2x20mm. screws can be used to mount the ball caster to the robot chassis.