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Boxford lathe thread dial indicator

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Alan Charleston	22/11/2022 06:29:59
157 forum posts 26 photos	Hi, I made a TDI for my Boxford about 10 years ago. Here is a picture of it. It was only supposed to be a prototype so I made it from PVC. It worked so well however that I have used it ever since. I didn't know what the correct gear form should be, so I actually made the 16 tooth gear using a module 1 gear cutter. The OD of it is 17.8 mm which was chosen to mesh correctly with the lead screw and is in fact pretty close to the 18.0 mm required for a module 1 gear. As the gear was also made from PVC, I wasn't worried about damaging the lead screw with an incorrect gear profile. The indicator works well. When I made it I started to do a set of drawings for it but never finished them. This is a far as I got. As you can see, rather than angling the teeth on the gear to follow the lead screw thread, I angled the supporting shaft. Here it is on the lathe. If there is any interest, I can finish the drawings and post them here. Thanks to Dave I now know how to cut a gear with the correct profile so, although the current set up works OK I'll probably cut a new gear for it. Regards, Alan C.
Grizzly bear	22/11/2022 18:37:25
337 forum posts 8 photos	I like that, Alan. Ingenuity unlimited! Bear....

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