Talk:Screw thread

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Contents 1 Rolling vs Forming 2 Tinnerman nut? 3 Most common standard 4 Wireless LANs 5 Tripod threads 6 Precision threads

[edit] Rolling vs Forming

Thread rolling is properly a type of forming -- not sheet metal rolling. The "Rolling" link should point towards this article: http://en.wikipedia.org/wiki/Cold_forming

I'd do it myself but I'm not sure how (I'm primarily a consumer of Wikipedia at the moment; keep up the good work folks). [unsigned, 2007-10-31]

This has just been fixed by another user. — ¾-10 02:51, 2 November 2007 (UTC)

[edit] Tinnerman nut?

Is there a name for that splitted punched hole in sheet metal that allows things to thread into it? — Omegatron 02:47, 21 December 2006 (UTC)

Tinnerman nut? Begs 02:56, 2 March 2007 (UTC)

I know that a nut stamped out of sheet metal with its hole thus formed, e.g. one that clips over the edge of a body panel, is called a speed nut in the automotive industry. Re the same type of hole in the middle of a sheet (not a nut): someone in some industry (autos? appliances?) must have a name for that. Haven't heard one if so. — ¾-10 02:45, 2 November 2007 (UTC)

[edit] Most common standard

The article Screw has a cited source saying that, as of 2006, UTS is still the most common standard, not Metric or BPS, yet this article says otherwise with no source. Apwvt 13:53, 21 March 2007 (UTC)

This has since been fixed. — ¾-10 02:47, 2 November 2007 (UTC)

[edit] Wireless LANs

Wireless LAN connectors are often "reversed". But that doesn't mean left hand thread. It means "reversed sex", i.e., pin inside the jack and socket inside the plug. At least that's all I've ever seen. Is there a reference for the "lefthanded" statement? Paul Koning 11:03, 13 September 2007 (UTC)

The wireless LAN connector, reverse SMA, is a right-handed thread. I've removed this. Robert Hiller 09:12, 30 September 2007 (UTC)

[edit] Tripod threads

There is confusion about standard tripod threads. Apparently this was originally 1/4-20 whitworth (55°), but a later standard (DIN 4503/ISO 1222) defined it to match 1/4-20 UNC (60°). This should be noted in the article along the with relative prevalence of the two. Robert Hiller 09:12, 30 September 2007 (UTC)

[edit] Precision threads

The article now mentions thread grinding for precision threads. What about lapping? That was used at least in the past -- Moore Special Tools did it as the final step after grinding for precision lead screws. Paul Koning (talk) 20:19, 18 April 2008 (UTC)

I think that grinding would be mergable into the first item ("cutting") in that list (as it is anohter method of simple removal excess material). --Splarka (rant) 07:32, 19 April 2008 (UTC)

It is true that grinding is a true metalcutting process, as each grain of abrasive functions as a microscopic single-point cutting edge (although of high negative rake angle), and shears a tiny chip that is analogous to what would conventionally be called a "cut" chip (turning, milling, drilling, tapping, etc.). However, among people who work in the machining fields, the term cutting is understood to refer to the macroscopic cutting operations, and grinding is mentally categorized as a "separate" process. This is why the terms are usually used in contradistinction in shop-floor practice, even though technically grinding is a subset of metalcutting. Therefore we could make "Thread grinding" a subhead below "Cutting", but if we do, we need to explain the above brief explanation.

As for lapping à la Moore Special Tool, I'm going to add it, with an explanation that it is basically ultra-deluxe toolroom practice, rarely employed except for, well, special tools (high-end machine tools). — ¾-10 14:53, 19 April 2008 (UTC)

Update: Done. — ¾-10 16:39, 19 April 2008 (UTC)