Size of threads on milling arbor

Size of threads on milling arbor

This topic has 9 replies, 5 voices, and was last updated 30 July 2018 at 09:21 by Jens Eirik Skogstad 1.

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30 July 2018 at 06:47 #364625
Jens Eirik Skogstad 1
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@jenseirikskogstad1
Hi folks, i has bought milling arbor with 3/8 treads for drawbar. I has tried with 3/8 tap, do not fit in the 3/8 treads. Which size is treads on 3/8 drawbar? I must create a new drawbar for milling arbor with 3/8 size.
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30 July 2018 at 06:47 #26112
Jens Eirik Skogstad 1
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@jenseirikskogstad1
30 July 2018 at 07:02 #364626
JasonB
Moderator
@jasonb
Try 3/8" whitworth
30 July 2018 at 07:17 #364627
Jens Eirik Skogstad 1
Participant
@jenseirikskogstad1
Also it’s 16 treads on 3/8?
30 July 2018 at 07:24 #364628
JasonB
Moderator
@jasonb
Yes 16tpi on 3/8" Whit
30 July 2018 at 07:29 #364629
Michael Gilligan
Participant
@michaelgilligan61133
This nicely summarises UNC / Whitworth compatibilty: **LINK**

https://rycote.zendesk.com/hc/en-us/articles/204439391-3-8-Thread-Standards

MichaelG.
30 July 2018 at 08:03 #364632
Jens Eirik Skogstad 1
Participant
@jenseirikskogstad1
Thanks a lot! Now i can create a new drawbar with 3/8-16 and i has already 2 drawbar with 12mm and 1/2″.
30 July 2018 at 08:23 #364634
Martin Connelly
Participant
@martinconnelly55370
m10 x 1.5 is very close to3/8" x 16tpi. I would check if it is M10 as well as 3/8" x 16.

Martin C
30 July 2018 at 09:11 #364637
SillyOldDuffer
Moderator
@sillyoldduffer
Posted by Martin Connelly on 30/07/2018 08:23:40:

m10 x 1.5 is very close to3/8" x 16tpi. I would check if it is M10 as well as 3/8" x 16.

Martin C

+1 for that possibility.

They're so close you can convert one into the other by gently running a tap into the female thread. I wouldn't recommend it for everything, but it's an OK bodge on a drawbar.

Dave

Edited By SillyOldDuffer on 30/07/2018 09:11:39
30 July 2018 at 09:21 #364638
Jens Eirik Skogstad 1
Participant
@jenseirikskogstad1
I has tried with M10, will not distort the treads.. best to use correct size.
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