Collet threads

Collet threads

This topic has 7 replies, 5 voices, and was last updated 12 July 2013 at 21:29 by michael howarth 1.

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12 July 2013 at 18:49 #124434
michael howarth 1
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@michaelhowarth1
I bought recently a set of imperial collets with a drawbar. The thread on the collets appears to be M16 x1. The collets have some age to them and one is marked "Prost. Chicago". Is M16 x 1 a standard thread for collets?

Mick
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12 July 2013 at 18:49 #17115
michael howarth 1
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@michaelhowarth1
Collet threads
12 July 2013 at 19:11 #124438
Lambton
Participant
@lambton
Mick,

I would not think that old American collets would have a metric thread. If you have access to a reasonably modern Machinery's Handbook (mine is 26th edition) there are comprehensive lists & drawings of standard collets all with imperial threads. One very common collet is the 3C with a thread size of 0.640" x 26 tpi that is very close to what you have measured.

Eric
12 July 2013 at 19:12 #124439
Keith Long
Participant
@keithlong89920
Don't know about M16x1 excecpt it appears to be a standard metric "attachment" thread for model engineers (Model Engineers handbook, Tubal Cain).

0.642 in. 26 tpi seems to be the standard thread for 3C collets, so you might need to do some vary careful measuring especially if there is a possibility of wear.

Keith

pipped at the post!!

Edited By Keith Long on 12/07/2013 19:13:25
12 July 2013 at 19:38 #124441
Phil P
Participant
@philp
Could be Deckel tool & cutter grinder collets.

Phil
12 July 2013 at 20:12 #124442
michael howarth 1
Participant
@michaelhowarth1
Well done gents and thank you……..funnily enough, I measured these collets at 0.640" ish and my thread gauge also made it 26tpi……but as I could not find this thread in my limited references I thought it must be wrong and the nearest alternative I could find was M16 x 1. My next question, which I am sure will get an equally positive response, is :- where can I buy this size of collet as the 3/32" in my set is knackered?
12 July 2013 at 20:16 #124443
JasonB
Moderator
@jasonb
Rotagrip
12 July 2013 at 21:29 #124444
michael howarth 1
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@michaelhowarth1
Thanks Jason….just the job.

Mick
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