Diameter of a Thread

[Anonymous]

What is the different between the Core Diameter and Major Diameter of a Thread?

   

[JDMather]

What is the source for the two images you posted - be specific.

What edition of the Machinery's Handbook are you using for reference?

Did you attempt to simply sketch a thread to figure out what those numbers could possibly refer to?

(Wouldn't that be the logical thing to do - don't trust any book without the proof, model the geometry?)

[mdavis22569]

also do you know the dfference between Male and Female thread ..and Coarse and Fine thread?

[Anonymous]

What is the source for the two images you posted - be specific.

What edition of the Machinery's Handbook are you using for reference?

Did you attempt to simply sketch a thread to figure out what those numbers could possibly refer to?

(Wouldn't that be the logical thing to do - don't trust any book without the proof, model the geometry?)

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From internet

https://www.google.ca/search?q=core+diameter+and+major+diameter&biw=1920&bih=951&tbm=isch&tbo=u&sour...

http:/http://www.motalia.com/Html/Charts/unc_chart.html/www.motalia.com/Html/Charts/unc_chart.html

I am not using any Machinery's Handbook. No one is recommended me any.

I am in the process of gathering information to do a simple thread sketch. 

[JDMather]

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@Anonymous wrote:

1. I am not using any Machinery's Handbook. No one is recommended me any.

2. I am in the process of gathering information to do a simple thread sketch. 

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I am going to recommend that you visit the building called "The Library" and checkout a book called "The Machinery's Handbook" 

or

2. at least find a comprehensive reference on the internet rather than two random images with different nomenclature.

Didn't you already do this exercise in AutoCAD Mechanical?  If so, you should know all about threaded fasteners.

There is little point in continuing a discussion on threadforms until a suitable reference is located.

[mdavis22569]

@Anonymous

Might I ask ... Where are you located?   Wondering if you need the Machinery handbook or another type of standards handbook for where you're located.

I'm kind of surprised your instructor hasn't gone over threads etc, at this stage of designing and modeling ... 

[Anonymous]

also do you know the dfference between Male and Female thread ..and Course and Fine thread?

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I assume thread on the block is a Feamale thread and thread on the shaft is male thread. No idea about  Course and Fine thread thread.  

[JDMather]

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@Anonymous wrote:

... No idea about  Course and Fine thread thread.  

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Your original question is a question about thread nomenclature.

Without a common reference we already get into trouble.

The correct term (in the Machinery's Handbook) is Coarse thread, not Course thread.

Languages do not always translate clearly - so we need a common reference.

I recommend the Machinery's Handbook.

[mdavis22569]

Ok ...I would probably read more about that stuff...quite a bit more.    

 As JDMathers said ... you should know more about it, before you start designing it ...

[Anonymous]

I strongly believe only basic things can be taught in the class. It is person exposer to a kind of job will only enable him to specialise in a particular field.

My intension is not designing a thread. Finishing the course only.   

[mdavis22569]

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@Anonymous wrote:

I strongly believe only basic things can be taught in the class. It is person exposer to a kind of job will only enable him to specialise in a particular field.

My intension is not designing a thread. Finishing the course only.   

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Fair enough .... however you're asking us to teach you the remaining basics, some that not related to Inventor, nor an inventor issue.  

  This is something that almost anyone designing should know from the start. If you don't know how to put something together via the right nuts, bolts, threaded holes etc ... than you might want to step back and learn that.

[JDMather]

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@Anonymous wrote:

....My intension is .... Finishing the course only.    

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Students with such low expectations do not tend to do well in my classes.

[Anonymous]

Students with such low expectations do not tend to do well in my classes.

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Concentrating on present day only. Because future is mystery.

[Anonymous]

some that not related to Inventor, nor an inventor issue.  

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If those are not  related to Inventor I am very much happy. Because .500 - 13 UNC - 3B is given in the assignment .500 is a major diameter. I searched for minor diameter then only all issues came.

 

[mdavis22569]

So what is your exact question then?


Reading what you have circled you should be able to answer it ..and it's not Inventor related ...

[Anonymous]

My exact question is whether data given in the red circle is enough to feed in the hole dialog box or we have to find additional data from this data. 

[mdavis22569]

if you know how to read it ..then yes ...

 do you know what it says/means?   

[SBix26]

Are you trying to complete the model so that you can produce this drawing as the final product?  If so, you do not need to actually create the threads.  Instead, create the holes as threaded holes, using the Hole tool in Inventor, and select the 1/2-13 UNC 3B thread.  In the model, this will simply add a cosmetic thread texture to the hole and keep the thread data with the hole.  The drawing will show the thread properly, and when you use the Hole/Thread Note tool, it will give the proper callout.  In fact, the Hole/Thread Note tool will not give the proper callout if you create the actual threads.

Note, however, that by default Inventor uses fractions instead of decimals in ANSI Unified thread callouts (1/2-13 instead of .500-13).  This can be changed by editing the spreadsheet that contains the thread data.

Sam B

Inventor Professional 2016 R3 SP2
Vault Basic 2016 SP1
Windows 7 Enterprise 64-bit, SP1

[Anonymous]

Do you know what it says/means?  

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.500 - 13 UNC - 3B

.5 – Major Diameter

13 - Number of threads per inch

UNC - Unified National Coarse (I do not why it is called like that)

3 – I don’t know this meaning

B – Internal thread.

Pitch value = 1/13

[mdavis22569]

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@Anonymous wrote:

Do you know what it says/means?  

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.500 - 13 UNC - 3B

.5 – Major Diameter 

13 - Number of threads per inch

UNC - Unified National Coarse (I do not why it is called like that)

3 – I don’t know this meaning

B – Internal thread.

Pitch value = 1/13

.5 or 1/2" Thread

13 Threads per inch

UNC is correct ... and then you have UNF - for Fine Thread .. that's why

3b is the class of bolt related to the thread -  this one is the tightest and strongest, look up  3b Bolt Class.

and the minor for a .5-13 UNC-3b would be .500. But unless you're machining it yourself I think you'd be fine knowing everything you did from the .500-13 unc-3b