Glossary entry (derived from question below)
English term or phrase:
translation movement
English answer:
linear movement
English term
translation movement
"…are equipped with punches the translation movement of which is ensured by a system of fixed cams"
As I understand it, what this means is translation of the rotary movement provided by the motor into the linear movement of the punches. However, the wording does not seem right to me and I should be grateful for either confirmation that it is correct, or suggestions on how to correct it.
Non-PRO (2): Germaine, Yvonne Gallagher
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Responses
linear movement [the "line" being of any shape, but here is a straight line]
Translation
Translation is a term used in geometry to describe a function that moves an object a certain distance. The object is not altered in any other way. It is not rotated, reflected or re-sized.
https://study.com/academy/lesson/what-is-translation-in-math...
…are equipped with punches the translation movement of which is ensured by a system of fixed cams
here the "geometrical translation" of the punches is the shifting of the punches along the axis that is guiding their movement - the rotating cams are driving this "geometrical translation" of the punches.
Just to confuse a bit, this "geometrical translation" [= shifting along an axis] of the punches could also be seen as "the translation" [= expressing the same thing in a different way] of the rotary movement of the cams into a linear movement of the punches!
linear displacement
John is correct when he says it means a displacement or movement in a linear direction, thus excluding rotation, reflection, or any other of the geometrical transformations possible; however, 'translation' doesn't say (or need to) anything about the plane in which this takes place.
One might say 'lateral diisplacement', but that is a bit risky, since it implies some specific displacement that is not (say) longitudinal, whereas translation simply means 'a sliding movement in a single dorection' — hence 'linear' is a good synonym; but probably best avoided in a technical context, where it can so easily be taken to mean 'as opposed to non-linear' (a control law, for example)
Of course, I would probably more naturally say something like 'the ... is displaced in translation by means of cams' or 'cams are used to displace the ... in translation' etc.
| Hi Tony. I think "displacement in translation" is the wrong register for an instruction manual (that's context that I know that I should have provided in the first place). The machine has an electric motor, which drives an axle fitted with cams, which move the punches up and down. |
Spain
Native English with STEM speciality
Native in: English (Variant: British)
Works in: Spanish to English, German to English, English
Movement in x-y plane
So I my understanding of this is saying that the cams serve to move the punch in the x and y directions. Close to your interpretation, but subtly different (let me know if you want me to explain more).
I would probably just have a comma between “punches, the movement of which...”
Otherwise if you still think it’s unclear, you could go with “punches which are moved in the x-y plane by a set of cams.”
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Note added at 4 hrs (2018-09-08 14:56:07 GMT)
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Take the explanations with a pinch of salt, especially the x-y plane bit, since the thing actually moves up and down. My main point was meant to be that “translation” is the word used technically for, as Tony says below, a sliding movement, rather than a rotation or tilt. Not just the transmission of the motion for the motor.
| The movement is actually a vertical one (up and down). I had noticed the absence of punctuation, but there's no point correcting it until I know what other correction(s) I want to make to this sentence. |
| disagree |
Tony M
: The plane it is in is slightly irrrelevant to the movement of 'translation' — and indeed, a rotary movement could equally well take place within one plane.
12 mins
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Sorry, I didn't make it clear that I was just trying to use the x-y plane as an example to emphasise that it is not a rotation.
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| disagree |
Daryo
: "x-y plane" is irrelevant - a distraction from the key elements
5 hrs
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Discussion
Quoi qu'il en soit, je crois qu'il faut se garder de modifier des textes/concepts dont les nuances nous échappent. Ce qui "does not seem right" dépend largement de l'expérience de chacun. On l'a vu bien souvent dans ces pages, et dans tous les domaines.
Your question was:
"However, the wording does not seem right to me and I should be grateful for either confirmation..."
In contrast to what others have suggested, I don't see why you needed to change this. It's "translational dynamics/motion": http://physics-help.info/physicsguide/mechanics/translationa...
This comes from a "Senior Lecturer in General Physics with more than 20 years experience in different colleges and universities."
Also, there are four types of motion. I can even quote the BBC on this:
http://www.bbc.co.uk/schools/gcsebitesize/design/systemscont...
http://wiki.dtonline.org/index.php/Types_of_Motion
You said: "The punches move vertically (up and down)."
That isn't just linear; it's a reciprocating motion:
https://www.thefreedictionary.com/Reciprocating motion
Take a look at "Plant Engineer's Handbook" by R. Keith Mobley. This is close enough to your instruction manual. It reads "reciprocating linear motion machines" because there are non-reciprocating ones as well.
Best wishes
It's not Canadian, but I don't think that makes any difference.
When working on a solid piece all movements are either "translations" or "rotations" or various combinations of both.
To add potential confusion the "translation of the punch" [= the shifting of the punch along the axis that represents their only "freedom of movement"] reflects / is determined by the profile of the rotating cam that is driving / pushing the punch, so you could also say that the linear movement of the punch "translates" the circular profile of the rotating cam, but that's not the meaning of "translation" in this ST.
"the handle of a top makes a translation movement"
http://www2.cslaval.qc.ca/cdp/UserFiles/File/telechargement/...
My French is rusty, but I assume the French word can also mean "motion," as it did in the document above.
And here you got "translational motion," a quite frequent term:
"Motion can either be translational, rotational, oscillatory or just random. It would be translational if there is a change in place, oscillatory when it's moving between the two points to and fro and rotational if the body is spinning."
https://physics.tutorvista.com/motion/translational-motion.h...
"Translational motion is the motion by which a body shifts from one point in space to another."
http://www.g9toengineering.com/resources/translational.htm
PS
"Translation means motion along a path. Rotation means motion around a fixed axis."
http://www.skwirk.com/p-c_s-11_u-399_t-990_c-3787/types-of-m...
Best