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Thread Pitch & Major Diameters | |||
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Posted by: knuyenly ® 03/27/2006, 17:13:52 Author Profile eMail author Edit |
Hello,
Can sonmeone please help me out how to get the Pitch & Major diameters of a M37 x 0.75 external thread? Thank you very much |
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Re: Thread Pitch & Major Diameters | |||
Re: Thread Pitch & Major Diameters -- knuyenly | Post Reply | Top of thread | Forum |
Posted by: randykimball ® 03/27/2006, 23:41:22 Author Profile eMail author Edit |
Sure, I'd be happy to.. and I'll explain how I do it. Let's take a known thread from the Machinery's Handbook and extrapolate it out. Doing internal first. An M4.5x.75mm internal thread has:
If we take 37mm and subtract the 4.5 we get 32.5mm. the major dia. + 32.5mm becomes 37mm
An M4.5x.75mm external thread has:
Same process.... the major dia. + 32.5mm becomes 37.000 to 36.91
metric Effective Diameter = our Pitch Diameter No matter the diameter, the thread pitch still effects it the same way. However, the thread form and roundness of the part become more critical with diameter increases. Also, I would tend to run some on the loose side with a larger diameter (smaller end of the external and larger end of the internal tolerances). I need to state, although I'm quoting from the book, I have a bit of a problem with the internal and external major diameters being allowed to both tolerance into the same 4.5mm. I recommend that you DO NOT allow the external thread major diameter ever actually reach 4.5mm (or 37mm). Be sure to check my work.... wink.. /←randy→/ The worst suggestion of your lifetime may be the catalyst to the grandest idea of the century, never let suggestions go unsaid nor fail to listen to them. Modified by randykimball at Tue, Mar 28, 2006, 00:08:51 |
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Re: Thread Pitch & Major Diameters | |||
Re: Re: Thread Pitch & Major Diameters -- randykimball | Post Reply | Top of thread | Forum |
Posted by: knuyenly ® 03/28/2006, 12:06:31 Author Profile eMail author Edit |
Thank you very much!
That was clearly help. |
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