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52 Tooth change gear for an Atlas or Craftsman 12" metal lathe. 16 diametral pitch, 14-1/2 pressure angle, involute curve. Gear is 1/2" thick at the hub and 3/8" thick at the outer face. It has a 3/4" bore with double keyways. May also fit the 10" Atlas/Craftsman lathes but please do your own research before purchasing.
I have not printed these gears myself to test so please buy at your own risk. If you end up purchasing gears, I would love to hear your feedback on them.