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Scrumpy06/01/2017 19:02:25
138 forum posts

Have just started to strip the sadle could someone tell me what type of clutch I should find is it metal to metal via a taper cone thanks

Bazyle06/01/2017 20:19:30
3811 forum posts
166 photos

There is a sort of cup in two halves each of which is pushed outwards to engage the walls of the hole inside the wormwheel by two half moon shaped pieces . These are held at an angle against the shaft that carries the star wheel. Sounds a bit odd but you will understand when you find it. Somewhere on the web is a complete rebuild of a Hercus which is the same done by a guy in Australia.

There is a picture in post 11 of this thread.

If there is a more modern design as hinted by an earlier post I don't know the details though.



Edited By Bazyle on 06/01/2017 20:22:33

Scrumpy06/01/2017 21:25:47
138 forum posts

Hi Bazyle you are correct I have the old possible late 50 type first impression is there is no bolt ( left hand thread do you have any idea what thread or size it is or is there anyone who supplies spares ) I have looked at the website complete rebuild by hercus which I found of interest thanks

Mark C06/01/2017 21:34:00
707 forum posts
1 photos

As already mentioned by a few, join the boxford yahoo site. There are parts diagrams showing both types along with lots of other info. There are also lots of pictures to view that will help you work out what yours is.


Bob Brown 106/01/2017 22:03:39
964 forum posts
124 photos



Mark C06/01/2017 22:13:12
707 forum posts
1 photos

Bob, that is the early type. When you tighten the star wheel under power it rotates, the later type does not and has a different clutch assembly. The early type tends to slip if you don't tighten it up whereas the later one really gets a grip even if you only just nip the star wheel.


Scrumpy11/01/2017 18:38:01
138 forum posts

Hi all have stripped the saddle down and I have found the problem the 2 half moon chevrons that fit inside the clutch are missing does anyone have any idea what size they are and what they are made of or who can supply new ones I think the number is 52 in the catalogue

The left hand bolt in the end of the star wheel is also missing does anyone now what thread or who could supply me with one thanks

mgnbuk11/01/2017 18:53:31
416 forum posts
1 photos


These parts appear to be available from Boxford for not (too) outragous prices. Seems there are a few variations, though, so yo will need your serial number to get the correct parts for your machine.

Nigel B

Bob Brown 111/01/2017 18:53:49
964 forum posts
124 photos

Have you tried Boxford? serial number is on the bed  tailstock end.


Email Address :-

Boxford Limited

Dewsbury Road,

Telephone +44 (0)1422 324810
Fax +44 (0)1422 372503

Edited By Bob Brown 1 on 11/01/2017 18:55:37

mark smith 2011/01/2017 19:57:20
565 forum posts
295 photos

On my 1964 Southbend there is a spring clip on the inside end of the clutch. Most peoples seem to be missing whenever i see photos of southbends, also missing from the 1942 one i have nearly finished putting back together., Does the boxford have such a clip?

The clutch appears to work fine without it though.





Edited By mark smith 20 on 11/01/2017 19:58:45

Scrumpy13/01/2017 13:27:01
138 forum posts

Hi I have found my lathe was made in 1951/2 being a mark one .

the part I want for my lathe clutch plates part number 3656-64 ( half moon ) are not avalible from Boxford does anyone have any idea of sizes so I can get some made.

Or is there anybody else who sells Boxford parts I've made contact with the Boxford forum thanks

Old Elan14/01/2017 15:00:11
67 forum posts
19 photos

You could try John Ward at

I recently bought a cross slide screw and nut from him.

Excellent quality and well priced.

Bazyle14/01/2017 17:03:05
3811 forum posts
166 photos

I don't think you nee to be too precise with them actually. The curve I just so the fit the hole and don't rattle too much. In operation the bit that does the job is the centre part of the curve that jams into the bottom of the clutch cylinder. If the diameter is too great it catch at the sides not the centre and if it is too small it will twist off line.
The diameter edge is rounded off to fit the groove in the central operating rod.

I think a few experimental cardboard ones will soon find the fit if nobody has one in pieces to measure.

larneyin14/01/2017 21:30:53
10 forum posts
18 photos

Exploded view of clutch assembly

Exploded view

"Half moons" in position

Half moons in position

The half moons on my BUD are the same size as the "floor" of the clutch brake halves, i.e. when lying flat inside the brake shoes the flat edge is flush with the brake shoe edge

Here are the dimensions of the ones on my lathe

Half moon dimensions

The inside diameter of the brake shoes when in position in my machine is 1.180" which would be to OD of the half moons (near enough)

Both the straight and curved edges are well radiused as described by Bazyle

Hope this is of assistance

Mark C14/01/2017 22:52:06
707 forum posts
1 photos

I think if you make the OD to fit the clutch cups you will find it works OK. I think they are are about 1/8" thick (3mm) and as Bazyle mentions, just make them progressively smaller until they sit at the correct angle (by eye will be good enough)


Scrumpy15/01/2017 10:54:08
138 forum posts

Hi All what good hobby we have when so many people help a fellow modeller I would like to thank everyone for the help and kindness shown to me on this subject ,

With all the help I will be able to bring back to life a old girl of 67 to do the job she was ment to thank you. just a afterthought has anyone restored the half nut ( imperial ) for screw cutting

mark smith 2015/01/2017 11:26:47
565 forum posts
295 photos

I`ve been meaning to restore the half nuts on my spare southbend 9A. Havent got around to it yet but once ive figuring out how to clamp the half nuts for boring out the old (whats left of them)threads ,it should be pretty straight forward. I`ll be using the method popular in the USA of making a threaded bobbin out of bronze and gluing and pinning it into the half nuts before sawing them apart..

Like sort of described here:


Edited By mark smith 20 on 15/01/2017 11:27:14

Heres a photo of the half nuts that need repaired ,they are in fact boxford ones but fit perfectly in the southbend.The proper southbend ones are on the right which are on my good lathe.

half nuts.jpg

Edited By mark smith 20 on 15/01/2017 11:30:23


Edited By mark smith 20 on 15/01/2017 11:33:45

Scrumpy15/01/2017 12:30:08
138 forum posts

Lovely post I feel I would try to set my half nuts in my beaver mill and remove old threads but I would have a problem cutting the nut before splitting so over to a local machine shop I think

Scrumpy15/01/2017 12:35:22
138 forum posts

Sorry I should have replied to Mark no there is no spring

Scrumpy16/01/2017 13:17:20
138 forum posts

Hi All I have been told by Boxford they have the clutch plates after all , last week these were not avalible but after another search they have found a set .

Does anyone have any idea what size and pitch the left hand threaded bolt is thanks

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