Mill Power Feed Main Gear- Replacement
thingiverse
Replacement main drive gear in Chinese Clone Bridgeport type Axis Drives. (GPOAS from Amazon among others). Several photos attached for reference.. Size is 91+ mm od x 67.5 mm id and 15-16 mm width (this design is 16 mm). This drive is called "TON-E" on Ebay- available from China for about $10 with 2+ week shipping. This is a common type but there are several others. These gears are sacrificial in the power train - a good stall will dig a hole and them and will give you a pronounced click- two crashes and they'll start slipping, skipping.
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