Thread behavior

[Anonymous]

Hi!

I need to create the thread with the following parametrs.

But when I measure the outer diameter of the thread, the diameter is 10.752

What do I miss?

Thank you in advance

The file is attached

[Anonymous]

Yes, I thought about that, but all of you say that his tutorial is bad,

so I am not sure if it's worth to learn inventor using his tutorials.

@JDMather

Can you recomend me something? of somebody?

Thanks!

[Anonymous]

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@sbixler wrote:

@Anonymous I can't completely endorse your insistence on modeling exactly as the part will be fabricated.  That is sometimes a useful way to approach a taks, bu the process of design doesn't always work that way, and sometimes you may not even know for sure how your end part will be fabricated until it's nearly complete.

Of course, without taking fabrication into account you can end up modeling things that can't be fabricated cost-effectively.  But efficient and robust modeling doesn't necessarily mirror physical fabrication techniques exactly-- just as design parameters may be quite different from fabrication parameters.  I design a symmetric part around the center of the part, but I still draw it with dimensions from one corner wherever practical, because the needs of the designer are different from the needs of the fabricator.  That's the great thing about 3D modeling: you can have both: the design intent captured in the model, the manufacturing dimensions captured in the drawing.  Same with modeling techniques vs. fabrication techniques.

Sam B

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

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@SBix26 I design parts that we manufacture in house.  We have our own casting facility and state of the art mahine shop with 5 axis CNC, and fully automatic lathe with 4m auto bar feeder etc.  I need to think of how we will make it before i design it.  Sometimes this doesnt work to well as I figure it will be made on the 5 axis but when it comes to fabrication those machined are busy and it takes serveral other different machines to make the part.  The joy of being in the custom fabrication business

[brendan.henderson]

Where I work we do our best to design for manufacture based on the machines and the capabilities they have. We get little work done outside. 100% of the sheetmetal work we design for our CNC plasma with 24 station tool head for drill/tap/countersink/etc... And all bening gpoes through 1 brake press. This nails down the manufacturability part of most of our jobs with sheet metal parts (almost 60% of our jobs).

When it comes to the machining we take a slightly different approach. The DO tells the workers what to make and out of what material and size, while the actual method of manufacture is left to the fitter/machiners as there is a multitude of machines that could get the part made depending on machine availability. If 1 of the CNC lathes is available they might make the part there, and the process to do that is completely different from the process of making the part on a regular manual lathe.

I agree with most of what the other posters have said. Model the part as if you were making it with 1 of your machines. So for the internal threads the measurable hole will be the minor diameter of the thread size. This may be a difficult thing to get your head around if a) you are a drafting house with no machines or b) you have no practical manufacturing knowledge.

[Anonymous]

mdavis22569

==Make a 2d ..like mine and Dim the hole ... ===

Please explain me what I am supposed to do, I didn't understand that

:))

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 @mcgyvr,

 ===How do you think that to be made in the real world? Undercutting tool? ====

I have no experience in manufacturing,

so I don't how to made it in real world

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@swalton 

==I would model the hole with the tap-drill diameter==

== I don't know if a bottoming tap would be used on the real part, ==

What does it mean? Sorry, I didn't understand that

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@JDMather

1. I get the point

the drilled hole must be smaller than the fastener.

How do I do that in practice ?

I want to use fastener of Ø24mm, how do I choose the diameter of the hole?

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@Anonymous

Yes, thank you!

I will need your help

==As you can see my ID of the treads is not the 24mm as shown on your original but is in fact the true M24x? threads required.  Because my ID of the M24 is only 20.752 my chamfer is not as large.  To have a 24mm ID you would need to use an M26x1.5 thread pitch but even then you have 24.376mm ID

== 

 ok.

Again I undertsnad the point 

the drilled hole must be smaller than the fastener.

 But I didn't understand the rest

:)))

Thank you to all of you!!!!!

I do appreciate your help!

[mdavis22569]

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@Anonymous wrote:

@mdavis22569

==Make a 2d ..like mine and Dim the hole ... ===

Please explain me what I am supposed to do, I didn't understand that

:))

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Do you make any 2d idw's of the models you're working on?  

Maybe do that ....then dimension the hole. You'll see that the hole is a M24x3 and how the threads will look in the 2d. 

I don't use the thread command often, 90% of the time if I do, it'll be to put a thread on a shaft or some kind of round bar..  Otherwise I'll us the hole command with the thread option. 

[swalton]

Taps are the tools that cut the threads in the part.  They are commonally available in three different styles, depending on the required thread depth in the hole. Bottoming taps can cut threads close to the bottom of a blind hole. 

See: http://www.mcmaster.com/#standard-taps/=12rzwzd

[Anonymous]

thank you!

[Anonymous]

Yes, I understand it now!

Thank you!