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![]() | On 2 January 2024, it was proposed that this article be moved from Cam to Cam (mechanism). The result of the discussion was Moved. |
The article about cams is much too short. -Unsigned/Undated
it's much too short. i agree with the last person who started this discussion. and i need to base a whole research paper on this too! No picture either :( Davidbod 00:51, 28 May 2006 (UTC)
"The reason the cam acts as a lever is because the hole is not directly in the centre, therefore moving the cam rather than just spinning." It's a vague statement - I have observed many cams rotating in machines with a hole in centre. Altaf —Preceding unsigned comment added by 203.81.231.159 ( talk) 06:31, 20 March 2009 (UTC)
This article was written so poorly I can't tell the difference between vandalism and poor writing/a poor attempt to explain what the purpose of cam lobes are...this article IS sad —Preceding unsigned comment added by 67.246.13.226 ( talk) 02:05, 1 June 2009 (UTC)
Brushed up definition; it was way too hard to understand properly eg by people without engineering skills. Now it states:
A cam is a rotating or sliding piece in a mechanical linkage used especially in transforming rotary motion into linear motion or vice versa. [1] [2] It is often a part of a rotating wheel (eg. an eccentric wheel) or shaft (eg a cylinder with an irregular shape) that strikes a lever at one or more points on its circular path. —Preceding unsigned comment added by 91.176.221.125 ( talk) 09:41, 13 September 2009 (UTC)
Added this [first] image. Needs CGI'ing dough.
KVDP ( talk) 11:26, 23 September 2009 (UTC)
When i get some time, I'd like to add a displacement diagram to the article. This handbook should be referenced in this article: C. H. Moon, Cam design, a manual for engineers designers and draftsmen, AMCAM, 1961 --- BAxelrod ( talk) 01:58, 9 July 2010 (UTC)
Can we talk about this concept? It's what the nautilus cam used I think. DB ( talk) 01:13, 28 April 2011 (UTC)
A crossbow trigger mechanism does not rotate around its own axis. Thus it is not a cam. You should not let your China first syndrome get the better of your judgment. Gun Powder Ma ( talk) 09:30, 14 April 2020 (UTC)
This monograph happens to reconstruct a Chinese crossbow mechanism from the said Chou dynasty, but does not call it once a cam: E. Morton Grosser: The Reconstruction of a Chou Dynasty Weapon, Artibus Asiae, Vol. 23, No. 2. (1960), pp. 83-94. Nor does he in his follow-up article: E. Morton Grosser: A Further Note on the Chou Dynasty Pistol-Crossbow, Artibus Asiae, Vol. 23, No. 3/4. (1960), pp. 209-212.
And this author, who has been compiling over a hundred specimen of Chinese crossbow mechanism, does not refer to the mechanism either as a cam (K.P. Mayer: On Variations in the Shapes of the Components of the Chinese 'Nu-Chi' (Crossbow Latch), T'oung pao, vol. 52 (1965/1966)), pp. 1-7 (7):
The Chinese nu-chi (crossbow latch) has three moving parts:
- (a) the ear-shaped piece
- (b) the claw-like sears or teeth, also called klou hsüan with a vertical upward projection which is called the regulator kuei, also called wang shan and
- (c) the hsüan-tao, also called pan chi trigger.
These three moving parts in most specimens work in a kuo (metal housing) and in all cases are held in position and also pivot on cotterpins.
That makes it four monographs from reputable journals that discuss the trigger mechanism but never use the term. Gun Powder Ma ( talk) 06:26, 19 April 2020 (UTC)
A cam (Ka) is an irregularly shaped link that serves as a driving member and it imparts a prescribed motion to a driven link called a follower (Kaf). The trigger of an ancient Chinese crossbow is a typical cam mechanism, and it can be dated back to the 6th century BC (Zhang et al. 2004).Thank you ArchimedesTheInventor. That is sufficient for my needs. The definition given is very broad, but within the scope of my experience as a mechanical engineer, and supported by other apparently reliable sources. It may even exclude some mechanisms which would also be considered cams. Until an authoritative source can be found that rebuts that definition, I consider the point to be made. The mechanism shown in the linked video above fits that description. It may not be a "typical" cam as claimed, but it has the functional characteristics of a cam according to the quoted definition, which is sufficient. The more detailed descriptions appear to be referring to an illustration, and without inspecting the illustration I cannot say much about it.
cam mechanisms appeared in water-driven pestles by the latter half of the Western Han DynastyPlease check on this mechanism as it seems likely that it uses a continuously rotating camshaft driven by a waterwheel. If it does not, I would be really interested to know how it was done. · · · Peter Southwood (talk): 06:50, 21 April 2020 (UTC)
For me it is simply that a cam has to be a curved actuator, inducing a cyclic motion in the NEXT item up the chain in the mechanism. The ones we are most familiar with are revolving cams, but they can just be a curved surface which cycles such as those found in printing machines for example.
I would not say that anything I have seen in these examples is a cam, they are simply actuating by sliding notch and peg/spigot. Chaosdruid ( talk) 19:05, 20 February 2021 (UTC)
Ty 72.175.182.129 ( talk) 06:15, 24 November 2021 (UTC)
The result of the move request was: Moved ( closed by non-admin page mover) BegbertBiggs ( talk) 22:02, 9 January 2024 (UTC)
– (open to other dab modifiers) Too many other meanings for this one to be primary. Doesn't clear the pageviews field, and while common in Google Books and Scholar results, so are clippings of camera and various proper nouns. Hameltion ( talk | contribs) 17:53, 2 January 2024 (UTC)
![]() | This article is rated C-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | ||||||||||||||||||||
|
![]() | On 2 January 2024, it was proposed that this article be moved from Cam to Cam (mechanism). The result of the discussion was Moved. |
The article about cams is much too short. -Unsigned/Undated
it's much too short. i agree with the last person who started this discussion. and i need to base a whole research paper on this too! No picture either :( Davidbod 00:51, 28 May 2006 (UTC)
"The reason the cam acts as a lever is because the hole is not directly in the centre, therefore moving the cam rather than just spinning." It's a vague statement - I have observed many cams rotating in machines with a hole in centre. Altaf —Preceding unsigned comment added by 203.81.231.159 ( talk) 06:31, 20 March 2009 (UTC)
This article was written so poorly I can't tell the difference between vandalism and poor writing/a poor attempt to explain what the purpose of cam lobes are...this article IS sad —Preceding unsigned comment added by 67.246.13.226 ( talk) 02:05, 1 June 2009 (UTC)
Brushed up definition; it was way too hard to understand properly eg by people without engineering skills. Now it states:
A cam is a rotating or sliding piece in a mechanical linkage used especially in transforming rotary motion into linear motion or vice versa. [1] [2] It is often a part of a rotating wheel (eg. an eccentric wheel) or shaft (eg a cylinder with an irregular shape) that strikes a lever at one or more points on its circular path. —Preceding unsigned comment added by 91.176.221.125 ( talk) 09:41, 13 September 2009 (UTC)
Added this [first] image. Needs CGI'ing dough.
KVDP ( talk) 11:26, 23 September 2009 (UTC)
When i get some time, I'd like to add a displacement diagram to the article. This handbook should be referenced in this article: C. H. Moon, Cam design, a manual for engineers designers and draftsmen, AMCAM, 1961 --- BAxelrod ( talk) 01:58, 9 July 2010 (UTC)
Can we talk about this concept? It's what the nautilus cam used I think. DB ( talk) 01:13, 28 April 2011 (UTC)
A crossbow trigger mechanism does not rotate around its own axis. Thus it is not a cam. You should not let your China first syndrome get the better of your judgment. Gun Powder Ma ( talk) 09:30, 14 April 2020 (UTC)
This monograph happens to reconstruct a Chinese crossbow mechanism from the said Chou dynasty, but does not call it once a cam: E. Morton Grosser: The Reconstruction of a Chou Dynasty Weapon, Artibus Asiae, Vol. 23, No. 2. (1960), pp. 83-94. Nor does he in his follow-up article: E. Morton Grosser: A Further Note on the Chou Dynasty Pistol-Crossbow, Artibus Asiae, Vol. 23, No. 3/4. (1960), pp. 209-212.
And this author, who has been compiling over a hundred specimen of Chinese crossbow mechanism, does not refer to the mechanism either as a cam (K.P. Mayer: On Variations in the Shapes of the Components of the Chinese 'Nu-Chi' (Crossbow Latch), T'oung pao, vol. 52 (1965/1966)), pp. 1-7 (7):
The Chinese nu-chi (crossbow latch) has three moving parts:
- (a) the ear-shaped piece
- (b) the claw-like sears or teeth, also called klou hsüan with a vertical upward projection which is called the regulator kuei, also called wang shan and
- (c) the hsüan-tao, also called pan chi trigger.
These three moving parts in most specimens work in a kuo (metal housing) and in all cases are held in position and also pivot on cotterpins.
That makes it four monographs from reputable journals that discuss the trigger mechanism but never use the term. Gun Powder Ma ( talk) 06:26, 19 April 2020 (UTC)
A cam (Ka) is an irregularly shaped link that serves as a driving member and it imparts a prescribed motion to a driven link called a follower (Kaf). The trigger of an ancient Chinese crossbow is a typical cam mechanism, and it can be dated back to the 6th century BC (Zhang et al. 2004).Thank you ArchimedesTheInventor. That is sufficient for my needs. The definition given is very broad, but within the scope of my experience as a mechanical engineer, and supported by other apparently reliable sources. It may even exclude some mechanisms which would also be considered cams. Until an authoritative source can be found that rebuts that definition, I consider the point to be made. The mechanism shown in the linked video above fits that description. It may not be a "typical" cam as claimed, but it has the functional characteristics of a cam according to the quoted definition, which is sufficient. The more detailed descriptions appear to be referring to an illustration, and without inspecting the illustration I cannot say much about it.
cam mechanisms appeared in water-driven pestles by the latter half of the Western Han DynastyPlease check on this mechanism as it seems likely that it uses a continuously rotating camshaft driven by a waterwheel. If it does not, I would be really interested to know how it was done. · · · Peter Southwood (talk): 06:50, 21 April 2020 (UTC)
For me it is simply that a cam has to be a curved actuator, inducing a cyclic motion in the NEXT item up the chain in the mechanism. The ones we are most familiar with are revolving cams, but they can just be a curved surface which cycles such as those found in printing machines for example.
I would not say that anything I have seen in these examples is a cam, they are simply actuating by sliding notch and peg/spigot. Chaosdruid ( talk) 19:05, 20 February 2021 (UTC)
Ty 72.175.182.129 ( talk) 06:15, 24 November 2021 (UTC)
The result of the move request was: Moved ( closed by non-admin page mover) BegbertBiggs ( talk) 22:02, 9 January 2024 (UTC)
– (open to other dab modifiers) Too many other meanings for this one to be primary. Doesn't clear the pageviews field, and while common in Google Books and Scholar results, so are clippings of camera and various proper nouns. Hameltion ( talk | contribs) 17:53, 2 January 2024 (UTC)