What's the benefit of the modified thread
What's the benefit of the modified thread
(OP)
When we read a drawing of a US mechanical Company, a modified thread was used in the equipment. Does anyone can tell us why and how the modified threads are usually used?
Thanks a lot.
Thanks a lot.





RE: What's the benefit of the modified thread
Mike Halloran
Pembroke Pines, FL, USA
RE: What's the benefit of the modified thread
desertfox
RE: What's the benefit of the modified thread
A modified thread offers several advantages, namely recuts are performed only by qualified machining vendors, threads are kept under the control of my company as a professional corporation, there may be some strength or stress consideration associated with the change in geometric profile, reduce piracy in addition to others.
Primarily it is used out of commercial consideration.
Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada
RE: What's the benefit of the modified thread
RE: What's the benefit of the modified thread
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: What's the benefit of the modified thread
My opinion only do it when absolutely necessary.
special or modified threads require special gaging &
depending on the quantity special tooling.
MfgEngGear
RE: What's the benefit of the modified thread
"Good to know you got shoes to wear when you find the floor." - Robert Hunter
RE: What's the benefit of the modified thread
a special is a thread that is not a standard size or threads per inch/MM , a modified thread is basicly a thread that is just that modified standard, major dia or pitch diameter changed. ect. ect.
some of the prints I have manufactured to, had special threads for assembly constraints. clearance, or to throw off the after market guys.
MfgEngGear
RE: What's the benefit of the modified thread
However, the OP does say modified, lets hope he realizes the difference.
If it's important to the OP I'm sure he'll come back and clarify. Though of course if he has a print in isolation as the OP implies he may know little about application.
In which case make it to print, don't worry about the why, and charge the customer appropriately.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: What's the benefit of the modified thread
This is a well done explanation, also ANSI b1.1-1989 page 14 para 6.4. It would be nice if engineers followed this guide.
mostly the manufacturer has to decipher the major, minor & P.D.
MfgEngGear