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There is a lot of repitition between this page and helical axis. Does anbody think we should merge some of this? Davwillev ( talk) 15:11, 13 May 2008 (UTC)
I have merged the two and redirected helical axis to screw axis. Please discuss if anybody has issues with this. Davwillev ( talk) 21:44, 17 June 2008 (UTC)
If it is ok, I would like to make some revisions to this article to organize the presentation. You can see some of my work on other articles at machine (mechanical), linkage (mechanical) and Burmester's theory. Thank you, Prof McCarthy ( talk) 15:47, 16 June 2011 (UTC)
I think this article deserves higher ratings. Prof McCarthy ( talk) 01:56, 27 November 2011 (UTC)
The mathematics in this article seems correct.
But the explanation of it displays a complete lack of understanding of how to communicate this mathematics, starting with the first sentence:
"The screw axis (helical axis or twist axis) of an object is a line that is simultaneously the axis of rotation and the line along which a translation occurs. "
What rotation? What translation? We are talking about a rigid motion of the object here, but no mention is made of the rigid motion or of any other kind of motion. An object does not have any special "line", so the phrase "the screw axis of a an object" makes no sense whatsoever.
Many more such examples are found throughout this article.
It badly needs to be rewritten. Daqu ( talk) 00:30, 11 September 2014 (UTC)
Given a Euclidean motion combining a rotation and a translation, one has the challenge of finding the appropriate axis to express the motion as a screw displacement. Meeting that challenge involves viewing the Euclidean group E(3) as displaced rotations. Quaternion analysis#Homographies provides an approach. Some text, now obscured, should be restored. Rgdboer ( talk) 22:45, 12 September 2014 (UTC)
and the enantiomorphous 32, 43, 64, and 65.
I'm pretty confident this is referring to reflected analogs of the previous items, but this term is only used once in the page.
/info/en/?search=Enantiomorph redirects to /info/en/?search=Chirality_(mathematics), so this is a simple fix. I thought I would double check before making the change myself.
Sobeita ( talk) 12:21, 26 November 2017 (UTC)
Hi all,
Because biomechanics requires motion, I believe this article would benefit by including a GIF of a screw moving.
Brom20110101 ( talk) 02:42, 18 October 2022 (UTC)
The primary topic should be the Screw displacement, a kind of geometric transformation, not about its axis. I similarly recently merged "glide plane" into glide reflection. Does anyone object? – jacobolus (t) 20:19, 17 January 2024 (UTC)
some parts of this article are not screw theory– can you be more explicit? – jacobolus (t) 02:40, 21 January 2024 (UTC)
![]() | This ![]() It is of interest to the following WikiProjects: | ||||||||||
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There is a lot of repitition between this page and helical axis. Does anbody think we should merge some of this? Davwillev ( talk) 15:11, 13 May 2008 (UTC)
I have merged the two and redirected helical axis to screw axis. Please discuss if anybody has issues with this. Davwillev ( talk) 21:44, 17 June 2008 (UTC)
If it is ok, I would like to make some revisions to this article to organize the presentation. You can see some of my work on other articles at machine (mechanical), linkage (mechanical) and Burmester's theory. Thank you, Prof McCarthy ( talk) 15:47, 16 June 2011 (UTC)
I think this article deserves higher ratings. Prof McCarthy ( talk) 01:56, 27 November 2011 (UTC)
The mathematics in this article seems correct.
But the explanation of it displays a complete lack of understanding of how to communicate this mathematics, starting with the first sentence:
"The screw axis (helical axis or twist axis) of an object is a line that is simultaneously the axis of rotation and the line along which a translation occurs. "
What rotation? What translation? We are talking about a rigid motion of the object here, but no mention is made of the rigid motion or of any other kind of motion. An object does not have any special "line", so the phrase "the screw axis of a an object" makes no sense whatsoever.
Many more such examples are found throughout this article.
It badly needs to be rewritten. Daqu ( talk) 00:30, 11 September 2014 (UTC)
Given a Euclidean motion combining a rotation and a translation, one has the challenge of finding the appropriate axis to express the motion as a screw displacement. Meeting that challenge involves viewing the Euclidean group E(3) as displaced rotations. Quaternion analysis#Homographies provides an approach. Some text, now obscured, should be restored. Rgdboer ( talk) 22:45, 12 September 2014 (UTC)
and the enantiomorphous 32, 43, 64, and 65.
I'm pretty confident this is referring to reflected analogs of the previous items, but this term is only used once in the page.
/info/en/?search=Enantiomorph redirects to /info/en/?search=Chirality_(mathematics), so this is a simple fix. I thought I would double check before making the change myself.
Sobeita ( talk) 12:21, 26 November 2017 (UTC)
Hi all,
Because biomechanics requires motion, I believe this article would benefit by including a GIF of a screw moving.
Brom20110101 ( talk) 02:42, 18 October 2022 (UTC)
The primary topic should be the Screw displacement, a kind of geometric transformation, not about its axis. I similarly recently merged "glide plane" into glide reflection. Does anyone object? – jacobolus (t) 20:19, 17 January 2024 (UTC)
some parts of this article are not screw theory– can you be more explicit? – jacobolus (t) 02:40, 21 January 2024 (UTC)