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Unimat 3 dividing head

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3404621/10/2019 14:15:29
766 forum posts
4 photos

All new to me - but it comes with 4 plates with the numbers 24, 30, 36 and 40 ?

They all look the same to me so any help advice on how to use would be welcome

Looked on you tube but no wiser.

Thanks

Bill

Bizibilder21/10/2019 14:49:44
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61 forum posts
7 photos

They should have those specified numbers of holes in them - possibly in the back?

Emgee21/10/2019 15:35:33
1238 forum posts
210 photos

unimat 3 indexer.jpg0019.jpg

The plate is fitted between the  screw on chuck and the indexing head, the holes go to the back which allows the indexing pin to be located in any of the holes when revolving the chuck/shaft assembly, the degree scale provides a guide to the position.

The bottom pictured Unimat SL indexing head the discs with indentations on the circumference are fitted into the back of the head and locked onto the shaft so when revolved the indexing pin locates the indents to allow indexing of the circle, depending of course on the number of indents on the ring, I regularly use 1 with 24 indents.

Emgee

Edited By Emgee on 21/10/2019 15:40:03

Edited By Emgee on 21/10/2019 15:56:14 added pic

 

Edited By Emgee on 21/10/2019 16:08:13

Michael Gilligan21/10/2019 16:46:43
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14125 forum posts
614 photos

Further to Emgee’s post ...


This has some useful pictures of the internals [of the SL version] **LINK**

https://www.nielsmachines.com/en/emco-unimat-sl-dividing-head.html

MichaelG.

.

Edit: It is disappointing to see how different the Unimat 3 version is:

https://www.ebay.co.uk/itm/EMCO-3-INDEXING-DIVIDING-HEAD-4-PLATES-TOP-COND-NOW-30-00-OFF/143405046109

Edited By Michael Gilligan on 21/10/2019 16:52:11

Ian P21/10/2019 17:16:30
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2208 forum posts
90 photos
Posted by Michael Gilligan on 21/10/2019 16:46:43:

Further to Emgee’s post ...


This has some useful pictures of the internals [of the SL version] **LINK**

https://www.nielsmachines.com/en/emco-unimat-sl-dividing-head.html

MichaelG.

.

Edit: It is disappointing to see how different the Unimat 3 version is:

**LINK**

Edited By Michael Gilligan on 21/10/2019 16:52:11

I suppose that if there are no holes or other detents in the plates shown then one would have to describe this amazing Emco product as an 'Optical dividing head'.

The seller seems averse to showing what the body looks like but it looks to have a very short spindle

Ian P

Michael Gilligan21/10/2019 17:27:28
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14125 forum posts
614 photos

Posted by Ian P on 21/10/2019 17:16:30:

[…]

I suppose that if there are no holes or other detents in the plates shown then one would have to describe this amazing Emco product as an 'Optical dividing head'.

.

laugh

Not quite in the same league as my Leitz one

MichaelG.

JasonB21/10/2019 17:29:41
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Moderator
16431 forum posts
1739 photos
1 articles

As Emgee says the back have different mumbers of holes for indexing.

20191021_172014[1].jpg

Though the fronts only have angular graduations not hole numbers.

Not sure what is disappointing about the U3 but having one edge that fits directly to the lathe bed was often usefull to me in the past as were the other mounting options eg the two cap heads that can be seen allow it to fit the cross slide. As well as the ability to set it to any angle as shown on the face of the wheels not just what was covered by the index holes. having the standard M14 x 1 spindle nose is also a big improvement as you can easily fit any chucks or face plate with work left in them, with the SL you would have to take work off of it to get at the 3 mounting screws if you wanted to index an part that had been turned on the faceplate. With the U3 just unscrew from lathe spindle and screw onto indexer.

 

Edited By JasonB on 21/10/2019 17:47:39

Michael Gilligan21/10/2019 18:27:07
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14125 forum posts
614 photos
Posted by JasonB on 21/10/2019 17:29:41:

As Emgee says the back have different mumbers of holes for indexing.

20191021_172014[1].jpg

Though the fronts only have angular graduations not hole numbers.

Not sure what is disappointing about the U3 […]

.

Only the change from ‘gear style’ to ‘pin in a blind hole, on comparatively flimsy plates’ indexing.

The wear on your plate [left of picture] illustrates the problem.

MichaelG.

JasonB21/10/2019 18:42:30
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16431 forum posts
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It's only the black coating that has come off, no sign of wear in the metal, more a sign of me not pulling back against the pin's spring enough than a problem.

Also compared to the vast number of 5C spin indexers in use the plates are far less "flimsy" being of similar thickness but much smaller diameter. Again like the 5C indexers the holes are through holes but just covered by the scale disc in both cases the pin does not go full depth into the hole, think more like the pin on a dividing head's arm.

3404621/10/2019 18:50:24
766 forum posts
4 photos

Thanks one and all and grateful to Jason for pictures

Now had more pics from seller and all ties in ref holes in back - all there thanks Ian P

Thanks again

Bill

Ian P21/10/2019 19:22:39
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2208 forum posts
90 photos

None of the sellers pictures showed that the disks had holes (other than at the zero position?) and I'm always wary of sellers not fully describing items so I thought this Emco product relied on the users eysight. In reality having anodised labels is a good feature.

Ian P

Michael Gilligan21/10/2019 20:27:44
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14125 forum posts
614 photos
Posted by JasonB on 21/10/2019 18:42:30:

It's only the black coating that has come off, no sign of wear in the metal [...]

.

If you say so, Jason ... that's fine, and I retract my comment

Unfortunately, in the photo, it appears that several of the holes are worn oversize.

... appearances can be deceptive.

MichaelG.

JasonB21/10/2019 20:33:40
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16431 forum posts
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I'll take you a close up photo tomorrow. The pin on the Emco is tapered so may have worn the black off around the holes too

Bazyle21/10/2019 21:59:28
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4758 forum posts
187 photos

Unless the wear is uneven then the hole enlargement is not going to affect the indexed position. If you need better accuracy perhaps you need a 90 lb K&T with the astronomical dividing attachment. frown

Michael Gilligan22/10/2019 09:40:58
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14125 forum posts
614 photos
Posted by Bazyle on 21/10/2019 21:59:28:

Unless the wear is uneven then the hole enlargement is not going to affect the indexed position. If you need better accuracy perhaps you need a 90 lb K&T with the astronomical dividing attachment. frown

.

... or the original Unimat SL version ?

MichaelG.

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