Metric thread forms wrong!!
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I'm pretty sure the metric thread forms are wrong. I'm making a mould tool to make M10 nuts. I've made a lot of unscrewing mould tools over the years and the thread on the OD of the core needs to be the same form as the ID of a nut (same form as a tap). When I section a female thread in Fusion the form looks all wrong, the ID and OD are correct for mid limits but the pitch diameter is wrong.
Here I've sketched the correct form using data from HERE, the section is a male thread made by Fusion.
Metric thread form. You can see here the thread should be more truncated at the core than at the OD.
Example file attached.
Mark
Mark Hughes
Owner, Hughes Tooling
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