Hi Penelopepitstop:
I'm looking for the large back gear for a South Bend 11 inch lathe (serial no. 75285, model no. 11B, mfg. in 1937). It has 78 teeth, an outer diameter of 5.7110, an inner diameter of 5.407, a 1.187 hole thru at the center with a .100 X .187 key cutaway. The thickness of the gear is .688.
I can send you a detailed drawing of the gear or, if need be, the actual gear itself if you feel that you need more information.
Thank you for your time and efforts.
Sincerely,
Robert Young