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JDMather
Posts: 26,161
Registered: ‎04-20-2006
Message 11 of 19 (459 Views)

Re: Modeling Screw Threads

04-04-2012 11:36 AM in reply to: burkar0615

burkar0615 wrote:

  I know it can be done in Solidworks 


I don't think there is any functional difference between SWx and Inventor with regards to this geometry.

Do you have a close up picture of an actual part you could post so that I don't have to make a trip to the hardware store?

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RayFeiler
Posts: 401
Registered: ‎10-07-2008
Message 12 of 19 (457 Views)

Re: Modeling Screw Threads

04-04-2012 11:43 AM in reply to: burkar0615

I just downloaded this from http://www.mcmaster.com/ is it correct?

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JDMather
Posts: 26,161
Registered: ‎04-20-2006
Message 13 of 19 (454 Views)

Re: Modeling Screw Threads

04-04-2012 11:47 AM in reply to: RayFeiler

No.

Take a look at the original file.

 

or do you mean is it correct as a SHCS.
I originally read this as is this what the OP wants.

 

In any case, I don't think a thread can be run right up to the clamping face.

For a manufacturer I think they want to model exactly as produced.

Please mark this response as "Accept as Solution" if it answers your question.
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RayFeiler
Posts: 401
Registered: ‎10-07-2008
Message 14 of 19 (441 Views)

Re: Modeling Screw Threads

04-04-2012 11:57 AM in reply to: JDMather

Okay, I see. I think McMaster-Carr uses SolidWorks. Attached is the closest I could find on their site with a two minute search. I know the head is incorrect.

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burkar0615
Posts: 12
Registered: ‎04-04-2012
Message 15 of 19 (435 Views)

Re: Modeling Screw Threads

04-04-2012 12:00 PM in reply to: RayFeiler

Seeing as our camera takes terrible closeups, this is the closest I could find of a T17 point showing what I mean regarding how the thread diminishes near the point.

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Doug_DuPont
Posts: 208
Registered: ‎09-23-2008
Message 16 of 19 (405 Views)

Re: Modeling Screw Threads

04-04-2012 02:01 PM in reply to: burkar0615

Here is a very crude quick screw ex. Sometimes you need to think outside the box.

open the file and drag the EOP marker to the bottom. I know, I know the point is not correct. But you will see how to do it.

Douglas DuPont
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burkar0615
Posts: 12
Registered: ‎04-04-2012
Message 17 of 19 (364 Views)

Re: Modeling Screw Threads

04-05-2012 05:25 AM in reply to: Doug_DuPont

Yeah, that's really, really close, and, functionally, it's the closest I've seen.  Unfortunately, our company stresses the importance of a very, very sharp point (otherwise, "you may as well be trying to screw in a nail"), and that's where I'm encountering the majority of my problems.  I'd thought of doing 1 revolution, changing the pitch, another revolution, but then I'd just end up with a stair step.

 

And I haven't even begun on the Aster threads yet.  Maybe 2D will be the way to go, as much as I hate to admit it.   I think a well modeled graphical representation, when handed to a newer machinist, can be an eyeopener for them and give them a basis of comparison.

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Doug_DuPont
Posts: 208
Registered: ‎09-23-2008
Message 18 of 19 (353 Views)

Re: Modeling Screw Threads

04-05-2012 05:55 AM in reply to: burkar0615

I made that in about 2 minutes. I don't have your specs what you needed and I don't have the time to do the work for you. Just wanted to let you know if you put some time on this you can make this screw. With some planning you could make an I-part and cover every screw size you would need.

Douglas DuPont
Inventor 2013
GeForce GTX 580
Windows 7 64 Bit
Contributor
burkar0615
Posts: 12
Registered: ‎04-04-2012
Message 19 of 19 (347 Views)

Re: Modeling Screw Threads

04-05-2012 06:09 AM in reply to: Doug_DuPont

Nor would I expect you to do the work for me, and, as I said previously, the problem exists in the tip and how the coil wraps without the pitch changing.  Once I figure it out, I do intend to make it into an iPart, but until I can figure it out with a true point on it, it just becomes a backburner.

 

But believe me, I do appreciate your example and I intend to, hopefully, work with it a little bit today to see if I can get it to adapt to what I need.

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