Inventor General Discussion

Inventor General Discussion

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scottish_cad
Posts: 12
Registered: ‎06-17-2010
Message 1 of 2 (243 Views)

Basic question involving thread features

243 Views, 1 Replies
07-27-2011 12:38 PM

Hi all,

 

I'm slightly confused about threads, thread drawing conventions and the way inventor handles them.

 

Attached is a simple pdf example.

 

So here I have created a simple threaded hole and threaded screw (both with the same thread). I would expect the thinner lines (for each part), highlighted in breakout 'C' to be colinear. It is my understanding that they represent the major diameter for the inside (hole) thread and minor diameter for the outside (screw) thread?

 

The way the drawing looks to me is that the screw would just freely pass through the hole without engaging with the thread.

 

I'm not a mechanical engineer by the way :smileyhappy:

*Pro
sbixler
Posts: 1,879
Registered: ‎09-15-2003
Message 2 of 2 (213 Views)

Re: Basic question involving thread features

07-28-2011 05:51 AM in reply to: scottish_cad

First thing to try is to measure or dimension the diameters of the screw and hole to see where the error is.  My guess is that the hole is shown too big due to the .ipt file Document Options > Modeling > Tapped Hole Diameter being set to Major instead of Minor.

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