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Difference in spindle sizes

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old mart	07/06/2019 13:08:30
4655 forum posts 304 photos	Can anyone tell me if there is a difference between Boxford 1 1/2" X 8 and Atlas 1 1/2" X 8 spindle dimensions? I wonder if there is compatibility between registers and thread types?
Clive Foster	07/06/2019 14:32:15
3630 forum posts 128 photos	Atlas nose thread is always American 60° form. Original, flat belt driven Boxfords were the same but it was changed to Whitworth 55° form later. I think at the same time as Ver belt drive was introduced. Have heard suggestions that it went back to 60° form at some time but the three I've handled were all Whitworth. Parallel register sizes do vary a bit. Nominally the same but "it" might not screw on or it might be a bit loose. Thou or three variation. Depends o the actual machine(s). Clive

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