thread nomenclature
thread nomenclature
(OP)
for UNC external threads are the root diameter and minor diameter the same thing?
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
|
RE: thread nomenclature
The root radii is, if memory serves, the radii at the root of the thread form.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: thread nomenclature
ht
RE: thread nomenclature
RE: thread nomenclature
Root radii the the radius at the bottom of the 'saw tooth' shape you see if you like at a thread from the side/section it through the middle.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: thread nomenclature
Dmin is (essentially) the MMC of the male thread profile.
RE: thread nomenclature
The wording you've used is a little ambiguous. For the intent of the question you've asked (ie. the diameter measurement across opposite root radii), the answer is yes, they are the same. Root and Crest dia's equate to Minor and Major dia's.
But as KENAT is trying to point out, the use of the term root dia can be somewhat misleading. The root is the curved portion at the bottom of the thread form. That curvature 'could' be expressed as a diameter.
RE: thread nomenclature
ASME B1.1 distinguishes between the basic profile and the design profile since the basic profile is difficult to manufacture (essentially impossible for rolled threads).
The design profile allows for rounding of the root of an external (male) thread such that the root diameter will be smaller than the basic diameter.
RE: thread nomenclature
You have a crest diameter in a box, a root diameter on a pin.
That sort of thing....
Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada
RE: thread nomenclature
RE: thread nomenclature
http://www.roton.com/glossary.aspx#
RE: thread nomenclature
Simplistically it might be taken as similar to the minor diameter but I'm not sure it would hold up in court.
I'd also avoid using it because of the potential confusion with root radii.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: thread nomenclature
RE: thread nomenclature
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: thread nomenclature
RE: thread nomenclature
There must be an acho somewhere (see my post 28 Jul 10 8:47)
RE: thread nomenclature
RE: thread nomenclature
RE: thread nomenclature
root diameter (D, d1, d3, D4): diameter of an imaginary cylindrical or conical surface tangent to the roots of a screw thread
Note 1 - For external thread, the root diameter is the minor diameter. For internal thread, it is the major diameter.
minor diameter (D1, d1, d3): diameter of an imaginary cylindrical or conical surface tangent to the roots of an external thread and/or to the crests of an internal thread