Thread Relief Equation

[CADGemini]

Hello All,

I am having alot of trouble creating this equation to control a thread relief based on what type of thread pitch you have. I am creating this equation in the part without a design table. I cannot use a design table right now because that module is broken. SWX is trying to figure it out as we speak.

Anyways...here is what I have so far: "Thread Relief"= ( ( 1/56*1.5 ) ) Which gives the right dimension for the thread relief. Now what I need to do is tie that to the major diameter of the thread. So that when the thread size increases so does the thread relief. (see the picture link below for more information)

I think I can do this with an IIF statement but cannot seem to get the syntax correct. Any help would be greatly appreciated.

http://img233.imageshack.us/img233/9334/equationhelp75custom2ep.png

Best Regards,
Jon

Challenges are what makes life interesting; overcoming them is what makes life meaningful.

Solidworks 2006 SP0.0

 

[CADGemini]

Here is the file also:

http://multiterra.mooload.com/file....Threaded,+Male-Female,+RAF+4500+Series.SLDPRT

Best Regards,
Jon

Challenges are what makes life interesting; overcoming them is what makes life meaningful.

Solidworks 2006 SP0.0

 

[CorBlimeyLimey]

Are you asking how to incorporate a dimension into an equation or how to apply your formula to the dimension to get the correct Thread Relief?


Helpful SW websites FAQ559-520
How to get answers to your SW questions FAQ559-1091

 

[CADGemini]

CBL,

I have already incorporated a dimension into an equation(see first post). I am just trying to figure out how to link the major diameter of the thread size to change the thread relief accordingly. I thought I could do this in just one equation where the thread relief formula would equal whatever the major diameter is of the thread.

For the thread relief dimension needs to equate 1.5 threads. That answer will vary depending on what size thread I use.

Hope all this makes sense. If I need to clairify please let me know.

Best Regards,
Jon

Challenges are what makes life interesting; overcoming them is what makes life meaningful.

Solidworks 2006 SP0.0

 

[CorBlimeyLimey]

If the Thread Relief is only 1.5 x Pitch, then you don't need to tie the equation to the Major Dia. Multiple pitches can be had for one thread diameter.

Is the "1/56" in your example, the pitch?


Helpful SW websites FAQ559-520
How to get answers to your SW questions FAQ559-1091

 

[CADGemini]

yes 1/56 is the calculation for the pitch.

Best Regards,
Jon

Challenges are what makes life interesting; overcoming them is what makes life meaningful.

Solidworks 2006 SP0.0