Modification to a Harold Hall design
|Roderick Jenkins||17/09/2019 17:14:55|
1814 forum posts
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.
The detent spring is pretty strong, hence the big knob. The traditional coloured dots are for 4, 6 and 10 divisions.
|Nick Hulme||17/09/2019 18:06:34|
|723 forum posts|
That's cute, neat and well executed.
|not done it yet||17/09/2019 18:22:15|
|3941 forum posts|
Lucky, you myford users. The bull wheel on my lathe has (useful?) factors of only 5 and 13, I think!
|Neil Wyatt||17/09/2019 18:44:31|
17083 forum posts
Neat, you could have won the MEW reader's Tips with that
17073 forum posts
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 perman||17/09/2019 19:20:38|
1737 forum posts
Now theres an idea
Edited By martin perman on 17/09/2019 19:22:44
|Roderick Jenkins||17/09/2019 20:59:04|
1814 forum posts
Something like this:
Came with the lathe when I got it. As did this indexing arm:
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.
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