Tooth Angle for the Myford Bull Wheel Indexer device

Tooth Angle for the Myford Bull Wheel Indexer device

This topic has 2 replies, 3 voices, and was last updated 25 February 2025 at 02:51 by Chris Crew.

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24 February 2025 at 22:23 #785588
Greensands
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@greensands
I am interested in making up the Myford bull wheel indexer as described by Harold Hall but I am not sure of the optimum angle used for the single tooth detent. Has anyone had any practical experience wit this device and can suggest the required angle?
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25 February 2025 at 00:53 #785603
bernard towers
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@bernardtowers37738
60 tooth 20 dp profile shortened so it has a wedge action in the gear teeth oh thats 14 1/2 deg profile but not that important.
25 February 2025 at 02:51 #785607
Chris Crew
Participant
@chriscrew66644
Not sure if the one I made is of the Harold Hall design because I just copied one a late friend had made, but just make sure it engages radially with the bull wheel. Obviously, it is only suitable for S7 or ML7R lathes that have a 60 tooth bull wheel because the ML7 bull wheel has an odd number of teeth. I marked the bull wheel teeth with different coloured dots at 2, 3, 4, 5, 6, 10 & 12 although I probably have only used the first four divisions available in practice. 15, 20 & 30 would be more easily available just by counting the teeth. Again not sure if HH suggested doing this as I have not seen his design.
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