On 23/10/2012 13:39, michael adams wrote: ...
The OP is fairly expert at posting apparently reasonable requests that end up spiralling into long and involved threads, if you are tempted into answering them. I have a book that devotes 18 pages exclusively to measuring threads. It is not as simple a subject as it might appear.
Colin Bignell
Quite - but you have to read between the lines. When the source of such screws is the local shed you can make some reasonable assumptions.
Camera threads of nominal (historic) 1/4" Whitworth are commonly bodged with UNC bolts. Since they usually only need three or four turns, it's got away with.
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