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Cadmanto
Posts: 3,064
Registered: ‎12-07-2011
Message 1 of 9 (477 Views)
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Inserted Hole Dimensions Not matching Feature Dimensions

477 Views, 8 Replies
03-16-2012 07:07 AM

I typically as much as possible like to insert my dimensions into my drawing from my model.

I created holes in the model as a 1/4" tapped hole

THD.JPG

Yet when I show the dimensions in the drawing they show the minor dimension.

THD2.JPG

How do I get the 1/4" to show?  I have selected the feature and still get these results.

Best Regards,
Scott McFadden
Inventor Professional 2014
(Colossians 3:23-25)

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Posts: 25,269
Registered: ‎04-20-2006
Message 2 of 9 (468 Views)

Re: Inserted Hole Dimensions Not matching Feature Dimensions

03-16-2012 07:38 AM in reply to: Cadmanto

A 1/4 tapped hole is not 1/4".

Why aren't you dimensioning tapped holes with the Thread Note tool?

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Message 3 of 9 (465 Views)

Re: Inserted Hole Dimensions Not matching Feature Dimensions

03-16-2012 07:42 AM in reply to: JDMather

From my machinist days I would drill a 1/4-20 tapped hole at .201 (#7 drill) will remember forever.

 

Beginner machinist mistake is to drill the hole 1/4" - oops, no material for the thread.

The thread OD is 1/4 - not the hole.  (and even the thread OD is not drawn to actual size of 1/4 as then the dashed line would be too close the solid line in the print drawing).  The thread (or the hole) is drawn a nominal size - not actual size.  Inventor does allow you to control this and does this part of simplified thread representation correclty.

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Message 4 of 9 (463 Views)

Re: Inserted Hole Dimensions Not matching Feature Dimensions

03-16-2012 07:51 AM in reply to: JDMather

Notice that even the Tool Tip for Hole and Thread Notes dimensioning tool is absolutely wrong wrong wrong!

 

Drill a Ø45 hole for a M45 thread and there will be no material for the thread.

 

Tool Tip.png

 

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Cadmanto
Posts: 3,064
Registered: ‎12-07-2011
Message 5 of 9 (459 Views)

Re: Inserted Hole Dimensions Not matching Feature Dimensions

03-16-2012 07:57 AM in reply to: JDMather

Yes, I definately get that.  I agree.  I have worked at places that like calling out the dirrl size on the drawing, but sometimes that irritates the machinists because they feel like they should decide which drill and not the engineers.

I have also worked at places that just callout the tap size.

Currenyl I am at a place that wants to callout the tap size and not the hole size.  Which is why I wanted the 1/4"

and not the hole size of Ø.188  As  a side note I know that Ø.188 is not the minor for a 1/4" tap, but that is the dimension that shows up.  I can just create a dimension and call it a day, but in trying to continue to learn Inventor I would like to know how to accomplish this.

Best Regards,
Scott McFadden
Inventor Professional 2014
(Colossians 3:23-25)

*Expert Elite*
Posts: 25,269
Registered: ‎04-20-2006
Message 6 of 9 (457 Views)

Re: Inserted Hole Dimensions Not matching Feature Dimensions

03-16-2012 08:06 AM in reply to: Cadmanto

Cadmanto wrote:

...the machinists because they feel like they should decide which drill and not the engineers.


In my past life we might have some special tolerance considerations and specify the drill size rather than specify class of fit so that the machinist did not have to look up the correct drill size (or our standard to get the class of fit we wanted might not even be the "standard").

But I would dimension with the Thread dimensioning tool so that it states 1/4-20 under any conditions and then add the special drill size if required.

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Cadmanto
Posts: 3,064
Registered: ‎12-07-2011
Message 7 of 9 (456 Views)

Re: Inserted Hole Dimensions Not matching Feature Dimensions

03-16-2012 08:09 AM in reply to: JDMather

I know, but I just need to callout a 1/4" tap callout and want it shown based on the model feature.

Is that possible?

Best Regards,
Scott McFadden
Inventor Professional 2014
(Colossians 3:23-25)

*Expert Elite*
Posts: 25,269
Registered: ‎04-20-2006
Message 8 of 9 (454 Views)

Re: Inserted Hole Dimensions Not matching Feature Dimensions

03-16-2012 08:12 AM in reply to: Cadmanto

Does the Hole/Thread Note dimension tool not give you the expected results?

Please mark this response as "Accept as Solution" if it answers your question.
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*Expert Elite*
Cadmanto
Posts: 3,064
Registered: ‎12-07-2011
Message 9 of 9 (446 Views)

Re: Inserted Hole Dimensions Not matching Feature Dimensions

03-16-2012 08:42 AM in reply to: JDMather

Yes, that worked.  Thank you.

Best Regards,
Scott McFadden
Inventor Professional 2014
(Colossians 3:23-25)

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