What are these collets?

This topic has 22 replies, 5 voices, and was last updated 9 March 2017 at 18:31 by petro1head.

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8 March 2017 at 11:07 #25126
petro1head
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@petro1head
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8 March 2017 at 11:07 #287718
petro1head
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@petro1head
Since selling the Emco copy I am having a clear out. I got these with the machine but have no idea what they fit and if they are worth selling on eBay
8 March 2017 at 14:37 #287760
petro1head
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@petro1head
Could they be 3AM?
8 March 2017 at 16:24 #287774
Michael Gilligan
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@michaelgilligan61133
Posted by petro1head on 08/03/2017 14:37:28:

Could they be 3AM?

.

I don't think so … 3AM are proportioned more like the small watchmaker's collets.

It would be helpful if you could check the diameters and the thread pitch.

MichaelG.
8 March 2017 at 17:25 #287797
petro1head
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@petro1head
This may help?
8 March 2017 at 18:50 #287814
Michael Gilligan
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@michaelgilligan61133
Nicely done, Sir

… I may be back, later tonight

MichaelG.
8 March 2017 at 20:16 #287839
vintagengineer
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@vintagengineer
Are they buttress threads and is it a 1mm pitch?
8 March 2017 at 20:35 #287843
petro1head
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@petro1head
Don't know what a buttress thread is or looks like. The only thing I have to measure the pitch is a vernier which I would recon is not the best way, but it could be 1mm pitch.

Does this help:

Edited By petro1head on 08/03/2017 20:46:08
8 March 2017 at 20:39 #287845
JasonB
Moderator
@jasonb
Lay an M6 bolt or screw against the collet thread as a quick and dirty pitch gauge.

Butress thread is flat one side and angled the other /I/I/I/I
8 March 2017 at 20:49 #287848
petro1head
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@petro1head
Added a photo above. Checked against a 6mm tap and the pitch looks the same
8 March 2017 at 20:53 #287850
Michael Gilligan
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@michaelgilligan61133
My best guess so far is the Rivett/Hendey #2

MichaelG.

.

Go Compare: https://goo.gl/images/3cXi1B

Edited By Michael Gilligan on 08/03/2017 20:55:38
8 March 2017 at 22:13 #287871
petro1head
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@petro1head
Found a YouTube video and I think my collects are a fair bit smaller

**LINK**
8 March 2017 at 22:56 #287882
Michael Gilligan
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@michaelgilligan61133
Posted by petro1head on 08/03/2017 22:13:20:

Found a YouTube video and I think my collects are a fair bit smaller

**LINK**

.

Those are #6 not #2

MichaelG.
8 March 2017 at 23:57 #287890
Michael Gilligan
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@michaelgilligan61133
This chart should help: **LINK**

https://xtronics.com/wiki/Collet_Dimensions.html

MichaelG.
9 March 2017 at 08:15 #287905
petro1head
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@petro1head
I dont think these are the same. The tapered part is longer on mine and the end is not domed

Edited By petro1head on 09/03/2017 08:24:50
9 March 2017 at 08:41 #287909
Michael Gilligan
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@michaelgilligan61133
Posted by petro1head on 09/03/2017 08:15:35:

I dont think these are the same. The tapered part is longer on mine and the end is not domed

Edited By petro1head on 09/03/2017 08:24:50

.

Clearly "they" are not the same … but I don't understand why are .you are posting that sketch.

Sorry, but I don't think I am capable of explaining any further.

… I have already given you a link to a picture, and another to a table of dimensions.

MichaelG.
9 March 2017 at 08:51 #287911
petro1head
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@petro1head
Hi Michael

I appreciate your help. I posted the sketch along side the photo for comparison. None of the dimensions on the chart you linked to match.

Sorry if I am not getting what your saying, being a bit thick I know

Again thanks for your input
9 March 2017 at 09:08 #287914
Michael Gilligan
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@michaelgilligan61133
I will have another look whilst travelling this afternoon

… I thought it was the Hendey No. 2 on that chart.

MichaelG.
9 March 2017 at 09:18 #287917
Neil Wyatt
Moderator
@neilwyatt
Posted by petro1head on 09/03/2017 08:15:35:

I dont think these are the same. The tapered part is longer on mine and the end is not domed

Edited By petro1head on 09/03/2017 08:24:50

The diagram is just an indication, it applies to all the collets to show where to measure.
9 March 2017 at 09:43 #287921
petro1head
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@petro1head
Thanks Michael

According to the chart the Hendey No2 is 4.25" long and the body is 0.826" dia whereas mine is 2.5" long and 0.6" dia

Good point Neil
9 March 2017 at 12:00 #287948
Michael Gilligan
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@michaelgilligan61133
Posted by petro1head on 09/03/2017 09:43:17:

According to the chart the Hendey No2 is 4.25" long and the body is 0.826" dia whereas mine is 2.5" long and 0.6" dia

.

Sincere apologies … I mis-read the chart

The shape of the Hendey collets [which is unusual] looks right though … so I wonder if there was #0 version.

MichaelG.
9 March 2017 at 18:13 #287992
Michael Gilligan
Participant
@michaelgilligan61133
PH

After my earlier faux pas, I am perhaps unworthy to mention this, but … I think you have somehow doubled the angles on your dimensioned photo.

My quick on-screen measurement of your photo suggests that the included angle of the collet is about 30°

MichaelG.
9 March 2017 at 18:31 #287996
petro1head
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@petro1head
Indeed Michael, you are correct. School boy error, sorry.

Now, if I was able to edit my previous posts I would chnage the photo, but I cant and I think there have been enough photos
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