Using a gear to index a chuck

[Paul LParticipant @paull58212]

Hi All,

Many months ago I saw a drawing or photo of a setup that used a change gear and a plunger on a shaft to index a 3 jaw chuck,on the other end of said shaft by an amount of teeth (I may have imagined this!)

I've tried the search function but to no avail. Can anyone point me in the right direction please?

Paul

[Paul LParticipant @paull58212]

[JasonBModerator @jasonb]

As you have a Myford try this for starters

[Paul LParticipant @paull58212]

Thanks Jason.

That is certainly the same principle but I'm thinking of a 'stand alone' version that I can use on a mill as a crude 4th axis.

Maybe I saw that thread and and though I could adapt the idea for use on a mill, i really cant remember!

Regards.

[Peter G. ShawParticipant @peterg-shaw75338]

Could you be remembering my article in MEW293, May 2020 titled Dividing on the Warco 220? I used a changewheel fastened to an expanding bolt on the outer end of the lathe mandrel. Selection of the appropriate tooth or gap was by a spring loaded plunger.

Although for the Warco 220, I can see no reason why it should not be adapted to any other lathe.

Peter G. Shaw

[Paul LParticipant @paull58212]

Posted by Peter G. Shaw on 04/09/2020 15:28:23:

Could you be remembering my article in MEW293, May 2020 titled Dividing on the Warco 220? I used a changewheel fastened to an expanding bolt on the outer end of the lathe mandrel. Selection of the appropriate tooth or gap was by a spring loaded plunger.

Although for the Warco 220, I can see no reason why it should not be adapted to any other lathe.

Peter G. Shaw

Hi Peter,

Unless article was shown somewhere else I didn't see it there as I didn't subscribe to MEW until about an hour ago!

As soon as my login details arrive I will look back to that issue.

Thank you for your assistance.

Regards Paul

[Martin ConnellyParticipant @martinconnelly55370]

Harold Hall has one on his website. Look at his metalworking index, dividing project.

Martin C

[Martin ConnellyParticipant @martinconnelly55370]

Joe Pie has an interesting video on the subject of dividing. Probably not suited to your current needs but worth a look.

Joe Pieczynski ​​​​indexing tips

Martin C

Edited By Martin Connelly on 04/09/2020 18:31:16

[MichaelRParticipant @michaelr]

This may be what you are looking for Link

[Clive Brown 1Participant @clivebrown1]

Couple of photos to show my dividing arrangements made years ago.

One shows a detent plunger / change-wheel for my Boxford. The gear is on an expanding mandrel fixed in the lathe spindle bore. The spring loaded plunger mounts on the banjo, thus a wide range of change-wheel diameters can be accomodated. A 60 T is shown but I've used a 180 T to make protractor dials for a telescope mount.

The other picture shows a spin indexer I made when I first acquired my Raglan mill. The spindle is 3MT and has a Boxford nose. A 60 T change-wheel is mounted at the other end. The spindle can be locked. I can't remember where the casting came from, but it could also be fabricated. it may have been inspired by something in ME.

These items were made when commercial dividing equipment, rotary tables etc. was well beyond the average model makers budget. Different now.

Edit; the lathe picture has somehow got flipped, but the idea's there.

Edited By Clive Brown 1 on 05/09/2020 11:32:30

[Thomas CooksleyParticipant @thomascooksley79020]

Hi Paul, There is one in David Fenner's book:- THE MINI LATHE. It is for a Seig mini lathe but you may be able to adapt it. Tom.

[Paul LParticipant @paull58212]

Clive, the one on the mill is exactly the application i had in mind. Thank you.

Thank you to everyone for the comments and suggestions.

When i bought me lathe it came with a 'box of bits', I think some of the components are from a dividing set but I'm not sure. Any one recognise these parts?

 

Edited By Paul Liddle on 05/09/2020 12:12:42

Edited By Paul Liddle on 05/09/2020 12:14:05

Edited By Paul Liddle on 05/09/2020 12:14:47

Edited By Paul Liddle on 05/09/2020 12:17:17

Edited By Paul Liddle on 05/09/2020 12:17:32

Edited By Paul Liddle on 05/09/2020 12:20:06

[BazyleParticipant @bazyle]

The only non-obvious dividing head part is top left which is a tailstock support for possibly a Myford dividing attachment. Measure the bar, report here and someone can check against theirs.
Bottom left is probably meant to be mounted in a chuck or the tailstock (note keyway which might match the key for the tailstock barrel). At the headstock end it would work as an 'eccentric chuck' as used by ornamental turners and for drilling off centre, and at the tailstock end again for drilling but rather limited use.
Centre might be a chuck holder for the tailstock and the thick disc also a chuck mount.
Far right looks like it might go throgh the main spindle to hold a slitting saw, or be an adjustable backstop behind the chuck, or hold the index disc behind the spindle.
Also look at everything for something with 3 holes that match your index plate or the offset single hole it has.

edit : just noticed the middle bar thing to the left of the index plate may have a matching hole.

Edited By Bazyle on 05/09/2020 17:40:01

[Author]

Posts