Collet Identification and info wanted please.

[Martin King 2Participant @martinking2]

Hi all,

Just got back from a large tool auction and in the lots I purchased there is a full set of Imperial collets which I am going to dispose of on EBay.

Naturally I wish to describe these accurately but have never had any of this size and design.

I wonder if anyone can shed some light for me on the correct ID of these.

They all have the number 2804 on them with a logo that looks like the CC of Coco Chanel!

Imperial sizes from 1/32" up to 3/4"; the parallel shank diameter is 25mm and the external diameter of the threaded end is 23mm; 33mm maximum diameter at the bell end.

Any help most welcome.

Regards,

Martin

[Martin King 2Participant @martinking2]

[JasonBModerator @jasonb]

Crawford Collets is the CC, have a look here to find the size/type

[Boiler BriParticipant @boilerbri]

Nice haul. Should do plenty of tool holding with them. I am in the canaries at the moment and have brought Harold halls milling book to read. Even though I have s bit of experience in milling it's a good read with plenty of advice on milling tool holders.

Bri

[Martin King 2Participant @martinking2]

Thanks Jason,

checked the link but I guess they must be old stuff because the number and sizes do not show up.

martin

[VersabossParticipant @versaboss]

Too bad you did not give more informations: total length, angle of head,keyway or not, thread metric or imp., normal or sawtooth…

In my eyes they look suspiciously like W25 collets. .

Some numbers for these: length 97.6 mm, head dia. 33.7 mm, thread (very special! sawtooth) dia, 24.7mm / 15 tpi with angles 45/5 deg., head angle 15°, keyway 5 mm

Hope this can help?

Regards, HansR.

[RobboParticipant @robbo]

Martin,

Crawford collets no 2804 were/are used on Smart & Brown lathes, and may be specific to those machines.

So they won't be in a current Crawford list .

I should try the Yahoo S & B Group for confirmation

Edited By Robbo on 22/11/2015 22:09:04

[Nick HughesParticipant @nickhughes97026]

Anything match on this chart ?:-

**LINK**

[Martin King 2Participant @martinking2]

Versaboss,

More info:

There is a 4mm keyway; total length is approx 92.5mm;

external diameter of the threaded end is 23mm; 33.7mm maximum diameter at the bell end.

Martin

[John Stevenson 1Participant @johnstevenson1]

If they are a Crawfords collet they will have a left hand thread on them.

Also is it a 'normal' thread or one with one side more angled than the other ?

[Michael GilliganParticipant @michaelgilligan61133]

Posted by John Stevenson on 23/11/2015 10:34:05:

If they are a Crawfords collet they will have a left hand thread on them.

.

John,

Could you please elaborate upon that rather sweeping statement ?

I have Crawford Collets in several styles, none of which has a left hand thread.

Thanks

MichaelG.

[briefly out of 'retirement' to ask this]

[Martin ConnellyParticipant @martinconnelly55370]

I would be interested in them for my Smart and Brown Model M.

Martin

[Trev67Participant @trev67]

Hi Martin

2804 are the collets for a Smart & Brown model A, I think they also fit the model L plain turning and capstan lathes, I don't know about the others. The ones for my Model A are all marked 2804. I think they are a specific collet for these lathes, slightly bigger than a 3C and smaller than a 5C.

The sizes will be imperial, the 25mm diameter is 63/64 which is the spindle bore, the thread is approx 0.9" diameter probably 29/32, and 24tpi RH.

Hope this helps

Trevor

[Martin King 2Participant @martinking2]

OK, just measured them properly on a good mitutoyo mic.

The parallel diameter is 0.9834" and tghe diameter across the treads od is 0.9033".

Thread form looks totally symetrical to my eye under a x10 lens. Thread is RH

Looks like Trevor is on the money!

Martin C: send me a PM with a sensible offer that you are happy with to include the 2 index blocks as they are no good without the collets.

Thanks to all for the help.

Martin

[Martin ConnellyParticipant @martinconnelly55370]

I have dug out an old print out of the Crawford Collets products and scanned it to a PDF. There are 29 pages with dimensions and capacities listed by manufacturer so I was wondering if there was a good place to put this file or is it just a case of email it to people if they ask for it?

Martin

[EmgeeParticipant @emgee]

Hi Martin

Not sure if the Photo Album will allow PDF but if you save the scans as jpg they should upload to your Album.

Emgee

[Michael GilliganParticipant @michaelgilligan61133]

Martin,

As Emgee sugests … the album will only accept jpg

If that conversion is inconvenient for you, I would be happy to do it.

PM sent.

MichaelG.

[Martin ConnellyParticipant @martinconnelly55370]

I could convert to jpg format but there are 29 pages and it is probably best kept as one file. If someone has a web site that could make it available to anyone searching for collet dimensions for lots of manufacturers' machines that would be the best place for it. I have copied the Smart & Brown section to a single page made a new table with the data in it and put it in the files section of the Yahoo group for those lathes. It would be a lot of work to do that for all the other makes. As I write this it occurs to me that it may be something that could be put on the lathes.co.uk web site. I will ask Tony about it.

Martin

[Michael GilliganParticipant @michaelgilligan61133]

With thanks to Martin for spplying the PDF …

I have put the supplied pages into individual jpg files, here

The files are numbered to reflect the pagination.

MichaelG.

.

Edited By Michael Gilligan on 16/12/2015 16:48:07

Edited By Michael Gilligan on 16/12/2015 16:54:38

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