Howard Lewis | 09/07/2021 18:55:26 |
7227 forum posts 21 photos | If it is Whitworh form thread, you should be able to extend the profile and measure it as 55 degrees. The pitch can be measured directly off the scan or shadowgraph. Howard |
John P | 09/07/2021 19:58:43 |
451 forum posts 268 photos | Posted by Bill Davies 2 09/07/2021 15:12:46
Bill Not really a shadowgraph but a cheap alternative. |
Bill Davies 2 | 09/07/2021 23:55:36 |
357 forum posts 13 photos | Thanks, John, I'll take a look. Bill
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Mike Hurley | 10/07/2021 20:11:53 |
530 forum posts 89 photos | Interesting reading the article on the 'poor mans shadowgraph' in the MEW back issues. Just a bit time consuming for me to tackle at present as its just really an odd one-off job , but many thanks for the suggestion John. I'm trying a few more versions of some of the earlier suggestions (wax, plastics etc) to try and get a sharper profile, and possibly try a scanner as suggested if I can get a reasonable 'moulding'. They are quite old & not exactly pristine threads, so not too hopeful of the outcome but can only try ones best. I then need to determine the angle of taper (ready to cut new 'plugs' / stopcocks or whatever ends up going in them 'oles!) as I'm not assuming that's going to be any standard either, but will be easy enough to do. Thanks again for all the feedback guys.
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