Note: We have released an improved ball caster with 1″ plastic ball that we recommend over this older version for applications that are not somehow specifically tied to this item #956 design. The new version is available with better plastic rollers or with ball bearings and it holds the ball more securely.
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Overview
This ball caster kit includes a black ABS housing, a 1″ diameter plastic ball, three dowel pin rollers, two spacers (1/16″ and 1/8″ thick), and three #2 screw sets. The total height of the ball caster, 1.1″, can be increased to about 1.3″ using the included spacers. The three included #2 screws can be used to mount the ball caster to your chassis (the distance between the screw holes is 0.69″).
Note that our ball casters are designed for small robots; they are not intended to bear more than a few pounds. With more weight than this, friction between the ball and the housing will probably keep it from rolling well.
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Comparison of Pololu ball casters
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Pololu ball casters with plastic and metal balls. Ball diameter from left to right: 1″, 3/4″, 1/2″, and 3/8″. |
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Pololu ball caster ball diameter |
height with no spacers |
distance between screw holes |
weight with no spacers or screws |
| 0.40″ | 0.53″ | 0.03 oz | |
| 0.40″ | 0.53″ | 0.14 oz | |
| 0.53″ | 0.58″ | 0.07 oz | |
| 0.53″ | 0.58″ | 0.32 oz | |
| 0.91″ | 0.24″ | 0.25 oz | |
| 0.83″ | 0.61″ | 1.05 oz | |
| 1.10″ | 0.48″ | 0.65 oz | |
| 1.10″ | 0.48″ | 0.58 oz | |
1″ plastic ball (old version) |
1.10″ | 0.70″ | 0.36 oz |
