Digital inexing

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Digital inexing

This topic has 8 replies, 5 voices, and was last updated 3 September 2010 at 09:14 by John Stevenson 1.

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12 November 2009 at 11:53 #44953
Niloch
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@niloch
J.Malcolm Wild on page 65 of his book Wheel and Pinion Cutting in Horology says: “Finally we come to the ultimate in dividing in the lathe.” He goes on to show how these(1) products may be attached to the rear of the lathe mandrel using, I presume, a component similar to the one to be found in his kit for attaching a traditional Myford dividing head in the same position and shown here(2a).

There is a British equivalent shown here(3) making use of a Vertex rotary table. Similarly I guess these(4) tables might also be suitable.

My questions are (a) whether all rotary tables have a hole all the way through their centre so that they may be attached to the mandrel and (b) whether any horologist has experience of using such a set up?

Thank you.

Edited By Niloch on 12/11/2009 11:55:09

Edited By Niloch on 12/11/2009 11:57:24

Edited By Niloch on 12/11/2009 11:59:34

Edited By Niloch on 12/11/2009 12:04:18
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12 November 2009 at 11:53 #3574
Niloch
Participant
@niloch
Electronically Controlled Rotary Indexer
12 November 2009 at 23:46 #44984
John Stevenson 1
Participant
@johnstevenson1
Most of the modern imports have a number 2 Morse taper in the centre, some of the earlier imports of the Taiwanese era had No2 Morse or #7 Brown and Sharp taper.

John S.
2 September 2010 at 16:23 #55024
Tony Jeffree
Participant
@tonyjeffree56510
Niloch –

As the original designer/manufacturer of the Divisionmaster device, I can say that several of the indexers I sold before I passed the manufacture/sales operation accross to MEDW were to horologists, both amateur and professional. Many of the features of the design were the result of feedback from horologists that had particular requirements to meet; for example, Divisionmaster’s otherwise infeasibly high max number of divisions (it can provide up to 9999 divisions, which is rather more than needed for the average clock wheel) is there because a clockmaker needed it in order to accurately position the drum of a musical clock for re-pinning. The reason why I built the original prototype was because I wanted to use the device for horology (amongst other things).

Regards,

Tony
2 September 2010 at 17:04 #55025
KWIL
Participant
@kwil
I made an attachment to fit Myford Div Head on the end of the S7 Mandrel. Attachment is very much like one of the links. See last photo in my Album. Shown dividing new topslide base for Topslide with Internal DRO scale.
3 September 2010 at 00:15 #55035
ady
Participant
@ady
I thought I recognised that name from somewhere.

The Taig Lathe Book

http://www.cartertools.com/tonybook.html
3 September 2010 at 07:59 #55041
Niloch
Participant
@niloch
Tony, thank you for resurrecting my post with some very useful information, KWIL and ady, thank you both for your contributions too. I live in southern Hampshire (UK) and horologists are thin on the ground here for verbal/practical face to face advice. I have, however, grown a little (but only a little!) more confident in the use of a standard Myford dividing head encouraged by posts on this forum but I can see that the Divisionmaster device would still be a most useful asset and may be fool-proof too! Thank you again.
3 September 2010 at 08:59 #55042
Tony Jeffree
Participant
@tonyjeffree56510
Niloch –

Using Divisionmaster is significantly easier than using a conventional dividing head; I don’t think I have used a dividing head to date without screwing up somehow. Remembering where you are with a dividing head is fine until something breaks your concentration (the phone rings, someone walks into the room, your mind wanders because it is a tedious process…) and then suddenly you find you have cut a thin or thick tooth on the wheel. With Divisionmaster, you set the number of divisions and then just press a button to move to the next division.

I can’t guarantee that it is fool-proof, but it is at least fool-resistant!

Regards,

Tony
3 September 2010 at 09:14 #55044
John Stevenson 1
Participant
@johnstevenson1
Must be fool proof, I use one virtually weekly.

I have a large Hoffman head set up on one end of the Bridgeport Mill / Drill and it lives there all the while unless I need more real estate for the odd job.

It’s powered from an external power supply because of the size of it and as I say it’s in constant use doing splines , off set keyways etc.

I have not used any dividing plates for the last 6 or 7 years, in fact not since I finished up putting forty one and a half splines on an Alfa Romero half shaft

John S.
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