I need to create a somewhat small spindle that will hold a chamfer tool on one end needed to chamfer hundreds of holes inside of a ring approximately 20" in dia. This spindle will be mounted to a plate and driven via belt. Once mounted I will have control of the z-axis movement (spindle up-down). The ring will rotate via a chuck that is also controlled, so I will have an automated chamfering process. My question is, I was hoping to use standard cup/cone trailer axle bearings opposing each other for the spindle. I would mount a collet for the tool to one end of the shaft and a drive pulley to the other, The shaft would have a threaded area to snug up the bearings just like an common trailer axle. Rpm will be approx. 250rpm, I do not know the axial force, but the holes being chamfered are 3/8" dia, with an Rc of 50. I will use solid carbide for the tool which requires rigidity to keep from chipping. Is the cup/cone arrangement a good idea since almost all the force will be axial? or is there another bearing that may be more suitable for a spindle?
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