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Dividing head advice

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Robin30/12/2021 18:45:37
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571 forum posts
Posted by Steve355 on 30/12/2021 11:53:54:

That’s the first time I’ve had a thread hijacked by an actual highwayman laugh

Oops! Back on topic... The Vevor BS-0 spindle is bored through at 0.735" which is 12 bore but they haven't cut the chamber wink

DiogenesII30/12/2021 18:52:04
587 forum posts
230 photos

Just for the interest, there's a D/H on Ebay at the moment that is the right kind of thing - it's currently bolted to a sub-plate, but was originally supplied for a centre-slot machine...

Ebay - Indexing head...

Clock polisher30/12/2021 19:29:49
22 forum posts
32 photos

Good evening,

For work on longcase clock parts I took the very easy way out of buying a 3 inch diameter tilting rotary table and chuck backplate from WARCO. The backplate has an M14x1 stub thread. £80 or thereabouts brand new.

I tried to get a new 3 jaw chuck but failed miserably, imports just aren't accurate enough. Ended up with a three jaw from a Unimat 3 which screws straight onto the plate. £60 second hand from EBAY.

I can set any whole number angles using the scale on the table, for any uneven angle I go back to geometry and mark the required intervals out on a piece of paper which I then fit behind the chuck mounting plate. Using an external datum point I wind the table round to that point and Bob's a relative.

regards,

David

Tony Pratt 130/12/2021 19:35:14
2018 forum posts
12 photos
Posted by DiogenesII on 30/12/2021 18:52:04:

Just for the interest, there's a D/H on Ebay at the moment that is the right kind of thing - it's currently bolted to a sub-plate, but was originally supplied for a centre-slot machine...

Ebay - Indexing head...

I think the seller is dreaming at £275 but we will see.

Tony

JasonB30/12/2021 19:42:52
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If the steps on the hop up it is stood on are anything to go by then it's a 6" maybe even 8" chuck so no way it will fit on the small mill and no tilt for the bevel gears either.

Steve35530/12/2021 20:13:25
259 forum posts
177 photos
Posted by JasonB on 30/12/2021 19:42:52:

If the steps on the hop up it is stood on are anything to go by then it's a 6" maybe even 8" chuck so no way it will fit on the small mill and no tilt for the bevel gears either.

Yes, I had the same thought about that one.

Most vintage DHs on eBay seem to be professional tools for large mills, with a minimum centre height of 5.5”.

I keep coming back to the same choices… the Hemingway ones, which don’t tilt, may not be rigid enough and tend not to come with chucks. Or the Vevor 4”, which on paper is too big to use with the supplied tailstock on the Burke #4 …. But presuming the centre hole is MT2, a suitable arbor could be made.

looking at the rotary table, it seems the tilting ones don’t divide, and the dividing ones don’t tilt. So that’s out i think.

And watching Keith Rucker cut bevel gears, he didn’t use a tailstock (how would you) but I’m not sure if my bevel gear would work or not, it would be close. But if it failed I could fall back on the Dore Westbury, which has acres of headroom.

JasonB30/12/2021 20:24:00
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It's not impossible to mount Hor/vert rotary tables at an angle, I've certainly done it a few times and also have a small indexer that I can put in my mill vice at any angle.

tailstock is generally not used for bevels but most do have some height/angle adjustment which is useful when working with long tapered parts like fluted columns

Edited By JasonB on 30/12/2021 20:30:47

IanT30/12/2021 20:43:59
2002 forum posts
212 photos
Posted by David George 1 on 28/12/2021 17:42:29:

Hi Steve this is my dividing head.

20191201_125302.jpg

It has two positions taller for larger diameters on its side for more clearance under spindle. I bought it from the last Doncaster show for about £40.00 but I had to make two more plates for the gears I needed to cut.

David

Pretty sure this is a Timmins Dividing Head David - nice size for a Myford type machine, comes with a Myford chuck 'nose' and MT2 taper.

As David notes, it can be used on it's side (on a Myford or similar) or upright (on a Mill table). There's a matching tailstock casting too should you need one. Still available from Blackgates I believe (with the MT2 taper already machined). Doesn't "tilt" as such but you could probably work out a way to 'angle' it if required.

Big advantage is that they don't seem to go for the same kind of price as the other popular D/H alternatives but can still do just about everything the others can do too.

Regards,

IanT

Robert Trethewey27/03/2022 14:30:32
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17 forum posts
40 photos

I recently purchased a 6in dividing head and and have stripped and rebuilt it - However the original manufacturers nameplate had the name rubbed off - please can anyone identify for me the original manufactrurers name as the name plate says Made in Spain the part number is D1494A and it appears to be a Hoffmann type unit it weighs 50Kg it has a double sided plate with hole circles ranging from 49 down to 15 holes per circle it has a DIN 55022 or DIN 55027 faceplate see attached images 24 stop positions and power feed via 25mm shaft 6mm key

My album Robert Trethewey (6in Dividing Head Rebuild)

Name Plate

Howard Lewis27/03/2022 15:01:05
6295 forum posts
15 photos

If you are still looking for a Rotary Table, the vertex HV6 can, as the name says, be used in Vertical or Horizontal mode. With the face of the table vertical, the centre height is 4 inches.

The mounting slots may need to be extended to take Tee bolts / studs to enable it to be fitted some milling machine tables.

The Myford R T that i saw, bore an uncanny resemblance to my Vertex. There used to be a another lookalike made by Soba.

I use a Tailstock and the Division Plates for gear cutting, rather than the vernier scale. Although for some tooth counts, not obtainable with the three Division Plates, this may be needed..

Having made stepped dowels to align the Tailstock along the Mill table, I devised a means of aligning the Tailstock vertically, whilst simultaneously aligning the R T across the Table, after it had been set approximately with a square.

(The blank is turned in the lathe, using a Myford threaded chuck on a Myford / 2MT arbor, so that it can be transferred directly to the HV6 to minimise eccentricity )

Using this set up, I have cut gears from 20T 20DP to 100T Module 1 gears (for a mini lathe ).

I found out the hard way, that the division chart for my HV6 contained an error. Some work with EXCEL showed other errors and omissions.

So DO check that your chart is accurate for the number of divisions that you wish to produce.

A useful tip was to use a peg to prevent one of the fingers from moving whilst indexing..

HTH

Howard

.

SillyOldDuffer27/03/2022 18:51:32
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Posted by Howard Lewis on 27/03/2022 15:01:05:

...

The Myford R T that i saw, bore an uncanny resemblance to my Vertex. There used to be a another lookalike made by Soba.

...

.

Does anyone know who invented the HV6-style rotary table?

Many are described today as being Vertex copies, but I suspect Vertex are a Johnny-Come-Lately themselves, and the original design is much older.

A scamper round the web shows many big names made similar rotary tables in the past: Jones and Shipman, Clausing, Yuasa, Elliot, SIP, Palmgren and several others, branded and unbranded.

My bet is on an American company, because they developed vertical mills, and at early date - 19th Century. I reckon there's a long expired patent somewhere, covering a good design, which is why they are much copied.

Dave

Pete Rimmer27/03/2022 19:01:47
1255 forum posts
69 photos

Hardinge made a HV4 but it's an indexer not a rotary table. I don't know if they made a rotary/dividing version but it should be easy enough to find out with a search because Hardinge stuff is very well documented.

Michael Gilligan27/03/2022 21:06:03
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20289 forum posts
1064 photos
Posted by Howard Lewis on 27/03/2022 15:01:05:

[…]

The Myford R T that i saw, bore an uncanny resemblance to my Vertex. […]

.

.

The Myford-branded ones were made by Vertex

MichaelG.

Calum Galleitch27/03/2022 22:33:47
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194 forum posts
65 photos

Since we're talking about dividing heads, there is an excellent series on a George H. Thomas dividing head build currently ongoing on Youtube:

https://www.youtube.com/watch?v=q57xnGpfhA8

Very well paced and explained, I thought.

Grindstone Cowboy27/03/2022 23:18:44
892 forum posts
64 photos

Just to drift slightly off-topic, the funnel shape of a blunderbuss was more to make it easier to load than to scatter the shot over a wider area. Similarly with sawn-off shotguns, it's to make them easier to conceal, not spread shot.

Back to the dividing heads...

Rob

DC31k28/03/2022 08:51:22
721 forum posts
2 photos
Posted by Robert Trethewey on 27/03/2022 14:30:32:

...it appears to be a Hoffmann type unit...

Hofmann-type is a good description because it is surely not a Hofman.

For interest, their brochure is here: http://www.hofmann-rt.com/HTH-ENG.pdf

In all the online pictures of Hofmann ones, the notched indexing plate is at the rear of the spindle and there is a spindle lock (Kipp-style lever) at the front.

John C28/03/2022 10:07:13
273 forum posts
95 photos

Robert T: Your dividing head bears a resemblance to my EME model. Not an exact match, but similar in many features.

John

eme.jpg

Robin28/03/2022 11:49:14
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571 forum posts

I see the attraction in antique dividing heads but the days of picking up a bargain on eBay are long gone. All too often they are missing useful things like foot stocks, division plates, chucks, worms etc.

I am well pleased with my cheapy BS-0 clone. Many YouTubers try to persuade me that they have perfected the beast by changing the odd bearing, clamp or thrust washer here and there, but I think they are merely stealing the applause from our Asian chums who managed to put together this wonderful machine at such an unbelievable price.

So what would you change? wink

JasonB28/03/2022 12:24:12
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Posted by SillyOldDuffer on 27/03/2022 18:51:32:

Does anyone know who invented the HV6-style rotary table?

My bet is on an American company, because they developed vertical mills, and at early date - 19th Century. I reckon there's a long expired patent somewhere, covering a good design, which is why they are much copied.

You might be a bit early there Dave, looking at my 1895 Chas Strellinger & Cp catalogue reprint there are 20 pages of lathes, 12 pages of shapers and just one image of a horizontal mill. No sign of anything like a rotary table but there is something we would recognise as a dividing head.

Nick Hughes28/03/2022 18:28:22
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264 forum posts
144 photos
Posted by Robert Trethewey on 27/03/2022 14:30:32:

I recently purchased a 6in dividing head and and have stripped and rebuilt it - However the original manufacturers nameplate had the name rubbed off - please can anyone identify for me the original manufactrurers name as the name plate says Made in Spain the part number is D1494A and it appears to be a Hoffmann type unit it weighs 50Kg it has a double sided plate with hole circles ranging from 49 down to 15 holes per circle it has a DIN 55022 or DIN 55027 faceplate see attached images 24 stop positions and power feed via 25mm shaft 6mm key

My album Robert Trethewey (6in Dividing Head Rebuild)

Name Plate

 

 

 

 

 

 

 

Here you go:-

meca logo.jpg

Edited By Nick Hughes on 28/03/2022 18:33:03

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