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Some of you may have seen my post over on the antique machine section about the old Lodge and Shipley lathe I recently picked up. The small spindle gear is missing about 8 teeth. I have decided to make a new gear for it, and wanted opinions on cast iron selection. The gear itself is 4.116 OD, 12 DP, and 48 teeth. It is the drive gear for the feed gear train. I am debating between Type 40 Gray cast iron or Ductile iron. The Type 40 is easier to get and is a bit less expensive. Any thoughts or comments on choice here?