Screw threads

[Random1]

Well im starting to use inventor.... its SO much easier to draw anything in 3d than autocad :D

Well my question is how would i model the threads of a screw? Im still a forigner to the whole UI.. its all buttons :S

I am using inventor 10 and i can easily in 1 min create the actual screw part, just dont no how to do the threads, and is there a revolve command like in autocad?


Thanks,
Random1

[Mr T]

IF you use the COIL feature. Add a line then a circle or other closed profile eg a triangle for thread. Then coil it and adjust the pitch etc.

There is revolve but use the coil for threads.

Coil Thread
http://www.cadimage.net/mrt/ivbolt2.gif
http://www.cadimage.net/mrt/ivbolt.gif


Nick

[Random1]

Thanks, i just noticed that inventor even has that toolbar with all the buttons :) i closed it before because it only had 2d sketch...

[FGS]

I see how you can use coil to create a thread. In Inventor 11 I have a 'thread' part feature and have used it and all looks fine while in Inventor. I save an STL copy of the part and view it in an independant viewer (Like 'ModelPressReader') and the threads have disappeared. Whats going on ???

[Aardvark]

The thread tool only creates a visual representation of a thread. It does not actually cut a feature. The reason why is that the operation to cut a coil thread into a part is very memory and processor intensive, and it creates a horribly large part. If you cut actual threads into every fastener and then placed 300 of them into an assembly your computer would take hours to refresh after every action. When you use the thread tool inventor automaticly creates a thread note for use in an .idw. This wont happen with a coil, and you will have to create a non-parametric note for the thread. Unless you have a part for which you will be detailing and dimensioning the actual threads I would not recommend using the coil tool.

FGS,

Because the thread is just a picture and not actual geometry the thread representation is not exported with the rest of the information.

[FGS]

Thanks, now I get it :thumbsup:

I will be using the STL files for a 3D-Printer that FAB's ABS parts. So if I don't want to be using Tap's & Dies on plastic I need to do all my threads with 'coil' right !? Especially for something like a bottle cap thread, which most likely you can not get as a Tap.

Thanks Again !!!
:)

[Aardvark]

Yep! Any non-standard thread or a thread you are cutting from the model and not using a drawing note, must be drawn using the coil tool. Although I still say avoid using coil when ever possible.