12-21-2014, 06:45 PM
Personally I disagree with your statement about the metric system being confusing.
Both have what is considered 'standard' fine and coarse pitch threads. Yes, you can have two options for fine metric threads (e.g. M10x1.0 and M10x1.25) but you also have UNEF and UNS in the "Yankee pitch" system. For example, I have at least four different varieties of 5/16" bolts, with 18, 20, 22 and 24 tpi. I also think I have some 5/16-28 but I would have to check.
You may recall that I posted about the different drawbar threads on my NTMB30 tooling for my mill. I have tooling with M12x1.75, 1/2-12 and 1/2-13 pitch threads.
I've grown up using both systems and have no major issues with either system
Both have what is considered 'standard' fine and coarse pitch threads. Yes, you can have two options for fine metric threads (e.g. M10x1.0 and M10x1.25) but you also have UNEF and UNS in the "Yankee pitch" system. For example, I have at least four different varieties of 5/16" bolts, with 18, 20, 22 and 24 tpi. I also think I have some 5/16-28 but I would have to check.
You may recall that I posted about the different drawbar threads on my NTMB30 tooling for my mill. I have tooling with M12x1.75, 1/2-12 and 1/2-13 pitch threads.
I've grown up using both systems and have no major issues with either system
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