So the angle of contact on the inner race is the same as that on the outer race. An axial load passes in a straight line through the bearing, whereas a radial load takes an oblique path that tends to want to separate the races axially. “An angular contact ball bearing uses axially asymmetric races. This is from the angular contact bearings on wikipedia: The intended load is definitely in the radial direction. Posted in cnc hacks Tagged Brushless DC electric motor, cnc, CNC milling, spindle motor Post navigationĪn alternative name for skate bearings is “radial ball bearings”. Check out the bench test video and an exploded photo after the break.
A general RC Vehicle electronic speed control and a servo tester work in conjunction to manually regulate the spindle speed.
The 12 volt output of a standard ATX power supply was used to power the system for testing purposes. There’s another bearing in this assembly, a thrust washer this time, that keeps the arbor from moving axially in the housing. This housing holds two radial load ball bearings that support the new rotating collet arbor. The main housing was machined out of aluminum specifically for this project. ER16 is a designation of one of many collet standards. Collets allows for quick tool changes while providing a strong clamping force.
A collet is a device used to hold cutting tools by collapsing a segmented ring around the tool. This shaft size was important because the motor shaft was to be replaced with an ER16 collet arbor of the same size. started with an off the shelf motor that had an 8mm shaft. They are small, light, fast and can be inexpensive. wanted a new spindle for his CNC machine and thought that a brushless DC motor would be a great platform to build from. Brushless DC motors are common place in RC Vehicles.
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