By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Allendale Jan 24th

Problem identifying a thread

All Topics | Latest Posts

Search for:  in Thread Title in  
Dave Castle04/01/2014 16:55:52
5 forum posts
2 photos

Mmm........... This doesn't seem to be working.

I have now got the taps and dies. I have made 3/8x16 UNC and BSW females and neither of them fit. So am scratching my head again. I rechecked the dimensions and it still looks like the M10x1.5 is closest. So I made a nut with my M10x1.5 tap in an oversize 9mm pilot hole and even that wouldn't fit.

I have emailed Gitzo and asked them what thread they put on the tripod head.

Have also made some photos to show the thread and the handle I want to replace and how the Metric and UNC taps mesh with the male thread. The mesh with the BSW is no better than the UNC. I must be missing something.

My thanks for the additional information from Harry and others. I will let you know how things progress.

Dave

thread01.jpg

thread02.jpg

Ian Parkin04/01/2014 17:32:48
avatar
995 forum posts
235 photos

It,s not something like a 2 start thread?

making adjustment quicker?

pitches will line up but a standard single start nut wont go on

Michael Gilligan04/01/2014 17:34:52
avatar
19599 forum posts
997 photos

Dave,

That's certainly nearer to M10 x 1.5 ... although it still doesn't look quite right.

It may be an illusion, but it appears that the contact area changes from one flank to the other; which suggests that the thread pitches are slightly different.

We'll have to keep guessing, until Gitzo replies.

MichaelG.

.

P.S. The 3/8" UNC should match the camera attachment thread.

Michael Gilligan04/01/2014 17:37:45
avatar
19599 forum posts
997 photos
Posted by Ian Parkin on 04/01/2014 17:32:48:

It,s not something like a 2 start thread?

making adjustment quicker?

pitches will line up but a standard single start nut wont go on

.

Ian,

I think you are probably right !!

The helix angles do look very different.

MichaelG.

Nicholas Farr04/01/2014 17:55:53
avatar
3148 forum posts
1434 photos

Hi Dave, looking at your photo, to me it looks strange and as others have said, it may be a double start. While they were posting, I've taken a photo of a M10 threaded rod and have stitched part of your photo just above it and to me the angles of the threads look different. I know it may be due to camara angles and all that, but the two rings around your thread at the very start may suggest a double thread.

m10m3.jpg

Regards Nick.

Dave Castle04/01/2014 18:18:00
5 forum posts
2 photos

Well done Ian. Brilliant. Just checked and it is a 2-start thread. Something I never considered.

Can't even begin to think of what that means if I want to make one! Will have to think about it.

Thank you all for your help.

Cheers

Dave

Stub Mandrel04/01/2014 18:24:55
avatar
4311 forum posts
291 photos
1 articles

Lightbulb moment!

This isn't the thread that goes into the camera - it's the other end that fits into the clamp that holds the ball mount to the top of the tripod, hence the use of a quick 2-start thread and no need for compatibility.

Neil

Saxalby04/01/2014 20:17:04
174 forum posts
23 photos

I thought we were talking about the camera mounting thread.

Check my head again and the clamp thread is indeed a 2 start thread 10mm X 1.5mm pitch 3mm Lead

Barry

Ian S C05/01/2014 10:30:36
avatar
7468 forum posts
230 photos

The two start thread, that size is not too hard, or too technical to make on the lathe, made one for a part for the hood on a vintage pram, for our museum, made with the nut 10k away it fitted first try, there are two of these bolts, and now I can't work out which is which. Ian S C

Michael Gilligan05/01/2014 11:03:18
avatar
19599 forum posts
997 photos

Perhaps the most revealing aspect of this discussion is Dave's original comment:

[quote] A piece of M10 all-thread fits the stud like a glove. Angle, pitch and thread depth all match. [/quote]

Now that we know that the long stud has a two-start thread: That tells us an awful lot about the loose tolerances on commercial all-thread. ... Worth remembering!!

MichaelG.

 

Edited By Michael Gilligan on 05/01/2014 11:04:00

Nicholas Farr05/01/2014 13:41:18
avatar
3148 forum posts
1434 photos

Hi MichaelG, but his M10 x 1.5 looks as if it fits like a glove also.

Regards Nick.

Michael Gilligan05/01/2014 13:51:51
avatar
19599 forum posts
997 photos

Nick,

That's not what I thought. [see quote below]

... I suppose it depends how well your gloves fit

MichaelG.

Posted by Michael Gilligan on 04/01/2014 17:34:52:

Dave,

That's certainly nearer to M10 x 1.5 ... although it still doesn't look quite right.

It may be an illusion, but it appears that the contact area changes from one flank to the other;

.

Nicholas Farr05/01/2014 15:46:39
avatar
3148 forum posts
1434 photos

Hi MichaelG, I take your piont, however when comparing a tap against a full thread you get a clearer view than when comparing two full threads together.

I must have used a mile or two of "all-thread" in my time and have never noticed any significant difference between that and good quality bolts, but then it has always been industrial grade and not the toy town stuff you can buy at rip off prices from DIY stores.

Below is a piece of all-thread compared to a bolt, a bolt compared to a Goliath M10 x 1.5 tap and a piece of all thread copared to the Goliath tap with my USB microsope. I cannot see any significant difference between them.

m10-01.jpg

m10-02.jpg

m10-03.jpg

Regards Nick.

Michael Gilligan05/01/2014 17:11:34
avatar
19599 forum posts
997 photos

Thanks, Nick

Very helpful photos.

At least that confirms that some decent all-thread is available.

MichaelG.

All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Latest Forum Posts
Support Our Partners
JD Metals
emcomachinetools
Eccentric July 5 2018
MIDLNDS GARDEN RAIL Jan 2022
cowells
rapid Direct
Warco
Eccentric Engineering
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest