Talk:Buttress thread

Thread profile drawing

The thread profile drawing from wikimedia shows a non circular parabolic curve, which is not as shown in ANSI 45-7.

Is this copied?

This sure looks like the same text as [1] -- which one is the original and which is the copy? Paul Koning 21:51, 4 September 2007 (UTC)

Rewritten to avoid the problem. Paul Koning 15:29, 5 September 2007 (UTC)

Multiple meanings

In machine tool usage, buttress thread is triangular, with one face perpendicular to the centerline and the other face slanted at 45 degrees. Its purpose is not to create a seal, but rather to transmit force in one direction only. It is stronger than square thread of the same size (but square thread works in both directions). Paul Koning 21:51, 4 September 2007 (UTC)

Rewritten to add this aspect. It needs work but this is a start. Paul Koning 15:29, 5 September 2007 (UTC)

I'm a little confused. Is the oil field type of buttress thread trapezoidal or square in shape, while the machine type is triangular (like a saw tooth)? If this is correct, meaning they are two entirely different threads that are not really related in shape, I would suggest splitting the two into different articles. Sauer202 (talk) 22:49, 23 January 2021 (UTC)

Citation required removal

A citation is not required here, and would probably not explain the reasoning behind the original editors upload. All that is required is to look closely at the thread form (I suggest starting with the Simple Buttress form) and do the maths.

In the thread form shown 2 x f = 33% of the pitch, leaving the thread base at 66% of pitch. In a square thread form the thread base is never greater than 50% pitch. So, ... in any given size and material strength, the Simple Buttress thread form is 33% stronger than a simple square thread and possibly up to 50% stronger depending upon the f criteria used.

Citations are not an adequate alternative to going back to first principles and doing one's own thinking. George.Hutchinson (talk) 11:11, 5 April 2011 (UTC)

Quick release vice

I have added a paragraph about the possibility of such things. having seen one a long time ago. It was a woodworking device, probably just a clamp, and the buttress screw could be physically lifted out of a half nut to disengage it. But a Googling session failed to turn up an example so I can't finish the job properly. If anyone can find an example, please feel free to add a link or whatever. Thanks. Tiger99 (talk) 15:04, 11 October 2018 (UTC)

I have improved it a bit, with an expired patent and an article which describes automatically disengaging vices, which must be using a buttress thread, but still no sign of an actual product. Tiger99 (talk) 15:36, 11 October 2018 (UTC)

I just bought a new Irwin Record 52 1/2 vise off of Amazon with buttress threads, so I know they still exist. Unfortunately I can't find a link to the vise on the Irwin's web site. (16:22, 24 January 2024 (UTC)) — Preceding unsigned comment added by 108.51.138.10 (talk)

Suggested split

This article appears to discuss two different types of threads that are not really related in shape nor use. I suggest splitting the two into different articles. One is basically a sawtooth profile, while the other is a tapered ACME thread. Sauer202 (talk) 10:33, 25 January 2021 (UTC)

Disagree - This would create two extremely short articles. I would prefer to refocus the article on to a typical buttress thread and have a section at the bottom containing 'other types of buttress thread' and redirect "buttress pipe thread" to it.