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Question on Thread Creator
wolfgang_hochhäusler
Member Posts: 3 EDU
I created Nut and bolt both with diamter 8 mm. Then I added ISO-Thread, tried both 1 and 1.25 mm pitch. After exporting to stl and printing, there is no way that both fit. Should the diamter for inner and outer thread be different?
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Comments
Nut threads or internal threads are added to the cylinder surface. It's not logical because the should also be cut out of the borehole.
Currently I use 5 mm for screws and a borehole of 5.4 mm for nuts. Printed with these dimensions, they are fully compatible with ISO M5 threads on metal screws and nuts. Probably varying dependant on your 3D printer and nozzle size. Simply test it.
If you are 3D printing both bolt and nut, is better not to use threadcreator for nut. better subtract the bolt form a full nut with boolean using offset all parameter with a 0.2 offset or similar.
External and internal thread forms have slightly different specifications, which is necessary to avoid the two threads interfering with each other. See the data in this link:
https://www.engineersedge.com/screw_threads_chart.htm
or run your own searches. If you have access to a library (or a machinist) take a look at Machinery's Handbook which has dozens of pages on various thread forms and their specifications. The data has largely remained unchanged for decades and you can find used copies fairly cheaply in used bookstores or on Ebay.