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Posted by D Sherman [72.47.9.228] on Friday, December 17, 2010 at 10:11:12 :
In Reply to: Re: OT: need Model "A" tranny in Dallas, TX area posted by dave Austin [65.64.217.138] on Thursday, December 16, 2010 at 10:14:21 :
I think I have one that came as the speed selector for an old lathe. It was a lathe that was originally driven by a flat belt on a stepped pulley, but they had electrified it rather cleverly. They welded the rims of two v-belt pulleys around one of the flat pulleys, and made an elaborate bracket to hold this transmission and motor up above the lathe. They put a big V pulley on the OUTPUT shaft of the tranny and belted that to the motor, with a smaller pulley on the INPUT shaft of the tranny, that ran to the lathe. They then bent the gear shift shaft 180 degrees so it hung down below the tranny, but at a convenient distance above the lathe. I took the whole contraption off when I moved the lathe and never have tried to use it. Must take some getting used to to shift a backwards tranny with an upside down shift lever.
The last guy who used it used it, among other things, to make vibration-proof nuts for old sawmill machinery. He liked the old lathe because you select the pitch-selecting change gears for thread cutting by putting the pair you want on the shafts manually, which allowed him to cut really oddball thread pitches. This let him cut a nut that was just very slightly different pitch from the bolt that it went onto, which caused it to jam just enough to hold. I'm not sure if he had some home-made change gears for this or he could get what he wanted with odd combinations of the standard ones.