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Myford Bull Wheel Indexing

Modification to a Harold Hall design

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Roderick Jenkins17/09/2019 17:14:55
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1814 forum posts
461 photos

My toolpost mill is very convenient to mount and I have been considering a similarly quick and convenient way to do simple indexing rather than mount my GHT HDA. This solution is based on Harold Hall's design **LINK** except I have made the base a permanent feature, that still allows the headstock cover to shut on to the buffers. The indexer slides onto a T slot and is secured by half a turn of the locking lever.

di1.jpg

di3.jpg

di2.jpg

The detent spring is pretty strong, hence the big knob. The traditional coloured dots are for 4, 6 and 10 divisions.

Rod

Nick Hulme17/09/2019 18:06:34
723 forum posts
37 photos

That's cute, neat and well executed.
Nice job!

not done it yet17/09/2019 18:22:15
3941 forum posts
15 photos

Lucky, you myford users. The bull wheel on my lathe has (useful?) factors of only 5 and 13, I think!sad

Neil Wyatt17/09/2019 18:44:31
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Neat, you could have won the MEW reader's Tips with that

Neil

JasonB17/09/2019 18:56:20
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Posted by not done it yet on 17/09/2019 18:22:15:

Lucky, you myford users. The bull wheel on my lathe has (useful?) factors of only 5 and 13, I think!sad

Someone will now suggest you make an expanding arbour to stick in the back end to mount any of your change wheels or plates from div head and an indexing pin.

Edited By JasonB on 17/09/2019 18:58:45

martin perman17/09/2019 19:20:38
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1737 forum posts
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Posted by JasonB on 17/09/2019 18:56:20:
Posted by not done it yet on 17/09/2019 18:22:15:

Lucky, you myford users. The bull wheel on my lathe has (useful?) factors of only 5 and 13, I think!sad

Someone will now suggest you make an expanding arbour to stick in the back end to mount any of your change wheels or plates from div head and an indexing pin.

Edited By JasonB on 17/09/2019 18:58:45

Now theres an idea laugh

Martin P

Edited By martin perman on 17/09/2019 19:22:44

Roderick Jenkins17/09/2019 20:59:04
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1814 forum posts
461 photos

Something like this:

ri1.jpg

Came with the lathe when I got it. As did this indexing arm:

ri2.jpg

The pivot slips rather tidily onto the reversible thread/fine feed stud. Of course, if you have a gearbox it is unlikely that you will have many change wheels! (Mine did since it was a conversion, the gearbox was a later addition). I don't think the idea was ever completed, it needs a spring or something similar to keep the detent engaged. It's quite a neat idea though.

Rod

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