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Member postings for Dave Castle

Here is a list of all the postings Dave Castle has made in our forums. Click on a thread name to jump to the thread.

Thread: Problem identifying a thread
04/01/2014 18:18:00

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.



04/01/2014 16:55:52

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.




29/12/2013 21:12:39

Barry and Michael,

I am interested to use this as an opportunity to experiment and learn something about threads and how to make them. So I have ordered taps and dies for 3/8 BSW and UNC so will have a play. I am a bit new to this but I have got to start somewhere. My reference is Drills, Taps and Dies by Tubal Cain. From Barry's research I am expecting the UNC thread to do the job.

I am amazed at the time and effort you Guys have given me. Thank you.

Dave (I am in Worcestershire)

29/12/2013 18:17:57

Thanks for the link Jason. The 3/8 x16 UNC thread is very close to the metric. May be a case of so near and yet so far. I had not realised how many threads there were or how close some of the dimensions are. Have to start learning sometime.

Michael, the head is a Gitzo GS5120LVL about 10 years old.

Thanks for your prompt and useful replies.


29/12/2013 16:34:43

New to the Forum and to proper engineering. I need some advice please.

I do a bit of photography and have a tripod head I want to modify. The head has a clamping handle with a female thread which screws onto a fixed stud. I want to make another handle so need to make a new female part to fit the existing stud.

I think the thread is metric M10x1.5. I have a set of metric taps and dyes and the 1.5 thread checker fits the male stud perfectly. A piece of M10 all-thread fits the stud like a glove. Angle, pitch and thread depth all match. The major diameter of the stud and the all-thread are both 9.7mm. M10 nut that fits the all-thread won't fit the stud and the all-thread won't fit the female thread in the handle. It's not that they are a poor fit, they won't even start. I have wiggled and wangled to no avail. I am stuck. Any ideas on what is happening and what I should do next?

Many thanks.

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