Threading handbook? 5

[momoneymo]

Does anyone know of a good reference source for designing threads. I would like detailed information on why different thread forms are used, what the benefits of different types are, and calculations involoved in choosing a proper thread form.

I am currently looking at different variations such as tapered threads, buttress threads, and multi-start thread and I cannot find any information on why people use these and other thread forms. The only thing I can find information about is calculations for standard unified and ACME threads. Any help would be great thanks.

 

[unclesyd]

Here is website that will get you started.

You might want to look at any of the good machinery's handbooks available

http://www.hexagon.de/dose/dose1e.htm

 

[funnelguy]

My 23rd edition of The Machinery's Handbook certainly covers all of the questions you ask. Unclesyd is right, again!

I have only encountered buttress threads twice in my life. I still think the OEM used them to "buttress" his spare parts sales.

 

[momoneymo]

Thanks, for the suggestion. I have the 26th edition of the Machinery's Handbook and yes, it does show some of the thread forms and give some calculations, but I am looking for something more in-depth concerning why the different forms are used. I need to know what the benefits of different thread forms (such as tapered threads) are and which type is best suited for a particular application.

Anyone know of any in-depth source dealing specifically with threading and thread forms?

 

[ShaunE]

Page 1706 of the 26TH edition gives an overview of applications.

 

[momoneymo]

Again, thank-you for you post, but I am looking for much more detail. The handbook gives a general description of the different forms, but I want to know things like:

-What are the advantages of using a tapered thread as opposed to a parrellel thread?
-What are the pros/cons of multi-start threads?
-How do the thread shear areas compare for tapered vs. parrallel, buttress vs. ACME vs. unified.?
-What thread form provides the maximum thread contact area?
-What form is least suceptible to cross-threading?

In general, I am looking for a source of detailed information regarding why different thread forms are used, and how they compare. I have studied the Machinery's Handbook extensively and I would like further detail. Thank-you

 

[Romefu12]

MoMoneymo
As I recall the Machinery's handbook is an excellent source for this information however I do believe that their detailed and in depth descriptions have begun to fade over the years. I have the 26th, 23rd and 19th editions and I find that the older the edition the more in depth the information is especially in the machinists and mechanics information. I find the older versions more helpful. There are many websites to be searched if you search for keyword "screw thread applications" you might also try the "Millwrights Handbook"

 

[ShaunE]

momoneymo

check out this link for some useful info.

The site belongs to a power screw manufacturer who may be able to give you more details:

http://www.roton.com/application.1.jsp#5

Regards

Shaun.

 

[limct]

Hi Momoneymo,
I hope you'll find what you're looking for in this Bossard website.

http://www.bossard.com/techinfo/en/index.html

Best regards,
ct

 

[griffengm]

Try Industrial Fasteners Institute, 1505 East Ohio Building, 1717 East Ninth St,Cleveland, OH 44114. The handbook I have is copyrighted 1988 and seems to cover some of the points you raise.

Griffy

 

[Cockroach]

Send me an e-mail regarding your request, "Sturni_Hueston@Yahoo.ca", there is an underscore between the "Sturni" and "Hueston". I provide an Excel program on Acme, Stub Acme and Unified National threading to the industry for geometry of pin-by-box dimensions complete with tolerance, three wire measurement calibration of the pin threading and normal/shear loading values.

The program is company protected, been in circulation to the public at no charge for over twelve (12) years.

Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada

 

[Screwman]

Try getting a copy of "An Introduction to the Design and Behavior of Bolted Joints" by John H Bickford. The third edition should still be available. This is the bible for fastener engineers; 950 pages of good stuff.
You will find limited info on tapered threads. Most of them have evolved over the years to provide sealing (sort of) but they are not the most robust mechanical designs going. The petroleum buttress tapered threads used in well pipe are a different matter; they are very well engineered.

Hope this is useful.

 

[CoryPad]

I disagree with Screwman. While Bickford's book is good, it does not address your question since it only deals with 60 degree threads used for fasteners. You still need information regarding other thread forms. Your best bet is a standard Mechanical Engineering textbook (such as the one by Shigley and Mischke) or Machinery's Handbook.

Regards,

Cory

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