|WikiProject Engineering||(Rated B-class, High-importance)|
- 1 Popular Culture
- 2 Drawing a Crank
- 3 Train window
- 4 Earliest evidence for crank and connecting rod
- 5 Great history section
- 6 Saw Mill Illustration
- 7 patented by James Pickard
- 8 Crank Cart
- 9 Crank/windlass
- 10 Compound Crank
- 11 Error in photograph description.
- 12 Scope of "crank"? Is linear motion an essential part?
File:Square Steam Logo.png Has anyone considered adding a mention to the Steam logo (which is a crank) to this page? — Preceding unsigned comment added by 18.104.22.168 (talk) 01:44, 3 February 2014 (UTC)
Drawing a Crank
Okay, so a crank is a... what? How on EARTH can I draw that on a SIMPLE diagram?
Earliest evidence for crank and connecting rod
I removed the inclusion of the alleged ancient Egyptian crank and connecting rod mechanism because it rests on erroneous interpretation of the cited reference and a lack of true understanding of the mechanism. In the context in which the crank and connecting rod mechanism appears, Robert Moores (p.146) does not speak of the ancient Egyptian saw, but of its "modern configuration as a slab-making machine". The entire absence of a crank and connecting rod mechanism in the ancient machine is corrobated by fig. 11 which shows the "operation of the 4th Dynasty drag saw". Gun Powder Ma (talk) 01:49, 4 October 2009 (UTC)
Great history section
Just wanted to congratulate Gun Powder Ma and Jagged 85 on an excellent expansion of the history section. It looks comprehensive, well written, and thoroughly sourced (how often do you find that in a WP article?). Another thing I like is that it's tightly and concisely written, without the bloat found in many articles. Kudos! --ChetvornoTALK 02:48, 22 March 2010 (UTC)
Saw Mill Illustration
The perspective seems to off quite a bit. The water wheel appears to be an oval and the peg gear seems to have pegs going in different direction than the other pegs. I found it to be a quite confusing illustration. Cipherseed (talk) 22:42, 10 March 2011 (UTC)
- Yes, the drawing isn't perfect, but it still illustrates the crank correctly. Wizard191 (talk) 17:50, 16 March 2011 (UTC)
patented by James Pickard
- As far as I know, James Pickard patented a particular application of the crank for use on steam engines, not the crank itself. A mention here would be appropriate as long as it doesn't imply that he invented the crank.--Roly (talk) 15:54, 21 February 2013 (UTC)
It is now: "Around 1480, the early medieval rotary grindstone was improved with a treadle and crank mechanism. Cranks mounted on push-carts first appear in a German engraving of 1589." But the reference says:
- "A. Schroeder, Die Entwicklung des Schleiftechniks (Haya-Weser, 1931), 31, fig. 8, holds that the first authentic rotary grindstone fitted with treadle and crank appears c. 1480 in a copper engraving by Israhel von Meckemen, while (60, fig. 58) the earliest mounted on a push-cart is found in a Cologne engraving of 1589." White (1962), p. 167
I read it the way that not the push-cart had a crank but it only transported the rotary grindstone. The first known hand driven crank cart was build c. 1655 by the 22 year old legless(?) clockmaker Stephan Farfler in Altdorf. Reported with image by J. G. Doppelmayr in Nuernberg 1730. -- Portolanero (talk) 19:10, 15 November 2012 (UTC)
Under Midle Ages, the text says "Medieval cranes were occasionally powered by cranks, although more often by windlasses". Surely the crank forms part of the windlass, doesn't it, or have I got my terminology wrong?--Roly (talk) 14:14, 11 April 2013 (UTC)
Error in photograph description.
Current article begins :- "A crank is an arm attached at right angles to a rotating shaft"
The text accompanying the 1939 Tibet photograph states :- "The perpendicular handle of such rotary handmills works as a crank" No it does not, the handle is parallel to the axis of rotation, not perpendicular.
Scope of "crank"? Is linear motion an essential part?
Does a "crank", as defines the scope of this article, require there to be both a crank and also a connecting rod or yoke to convert to or from purely linear motion?
The two mechanisms are distinct and the development of one from the other is an interesting historical innovation that warrants coverage. But for an article at Crank, I think we have to take the inclusive view and cover both. The mechanism of crank alone is widespread for hand-operating machinery, with countless examples and at least two illustrations here. The linguistic description (English at least) includes both mechanisms under the same term. Andy Dingley (talk) 09:07, 3 May 2017 (UTC)