PM-940M Spindle Wrench
thingiverse
Wrench to hold spindle still when inserting and removing R8 accessories. This is for a Precision Mathews PM-940M Mill. It might work for other mills with a splined shaft. Their manual lists the shaft as "6 splines, 28 mm OD" Flip this over before printing for best results. The rabbeted circle should point upwards. I printed this in PLA at 100% fill and it is working so far. I used this originally as a model in order to make it out of Aluminum. I connected the AL head to a steel bar with a 1/4"-20 thread That 1/4" piece broke after a couple of years of hard use. I expect that this PLA version will last quite a long time.
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