| Science Forum Index » Mechanics Forum » Designing rectangular gears |
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| Jeff |
 Posted: Sun Sep 21, 2003 4:50 am |
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In the book Five Hundred and Seven Mechanical Movements, Henry Brown shows a
diagram of two rectangular gears (drawing #30) that when meshed together
provide varying speed for the driven gear.
Anyone have any thoughts or references to a process for producing these
gears?
http://www.stirlingsouth.com/richard/develop/engines_under_development.htm
covers the design and fabrication of elliptical gears. Similar issues
I suspect.
From the drawing a least, it appears that each tooth is of consistent depth,
so treating it as circular wouldn't really get it.
Just curious.
-jeff |
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| Dan Bollinger |
| Posted: Sun Sep 21, 2003 6:45 pm |
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[quote:e07a925455]Epicyclic gearing is used only in the manufacture of
watch and clock gears.
[/quote:e07a925455]
Only? Not quite true. I'm using epicylic gearing (actually cogged belt and
sprockets) in my oval-turning lathe.
http://www.claycritters.com/lathe/index.htm |
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| Dan Bollinger |
| Posted: Mon Sep 22, 2003 7:57 am |
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[quote:4de4a8eaa5]How do you figure that this is epicyclic gearing? First of all, it's
not even gearing, it's a belt and sprocket (gears drive other gears).
And second, a timing belt pulley would technically require involute
teeth anyway.
[/quote:4de4a8eaa5]
Its my understanding that anything with a 'sun' and 'planet' configuration
is an epicyclic mechanism. Perhaps we are talking about two different
things? |
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| Charly Coughran |
| Posted: Mon Sep 22, 2003 9:25 am |
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"Jeff" <jeff@NOSPAMmanicwave.com> wrote in
news:nofbb.1101$og4.923@twister.southeast.rr.com:
[quote:bba94eda97]
In the book Five Hundred and Seven Mechanical Movements, Henry
Brown shows a diagram of two rectangular gears (drawing #30) that
when meshed together provide varying speed for the driven gear.
Anyone have any thoughts or references to a process for producing
these gears?
http://www.stirlingsouth.com/richard/develop/engines_under_developm
ent.htm
covers the design and fabrication of elliptical gears. Similar
issues I suspect.
From the drawing a least, it appears that each tooth is of
consistent depth, so treating it as circular wouldn't really get
it.
[/quote:bba94eda97]
Try some net searching on the phrase "non-circular gears".
One company that manufactures nothing but is
http://www.cunningham-ind.com/
--
-------------
Charly Coughran
ccoughran@DELETE_TO_REPLY_UCSD.EDU |
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| Michael |
| Posted: Mon Sep 22, 2003 12:01 pm |
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I can't give you a reference, but I've seen actual physical gears of this
description someplace--(perhaps the museum of science in Boston, or the
Exploratorium in SF?) Making them's not a lost art... |
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| Dan Bollinger |
| Posted: Mon Sep 22, 2003 5:02 pm |
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[quote:5f342a48f0]Its my understanding that anything with a 'sun' and 'planet'
configuration
is an epicyclic mechanism. Perhaps we are talking about two different
things?
Oh, I see what you're thinking of. I was referring to epicyclic gear
teeth, not an epicyclic mechanism. This is an alternate tooth
*profile*. Don
[/quote:5f342a48f0]
So I was. Thanks for educating me.  |
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| Jim Y |
| Posted: Wed Sep 24, 2003 8:58 pm |
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I have seen square gears in action (motorized) at a local science center. There is a web site that uses square gears as
a logo:
http://www.squaregear.net/about.shtml
I have seen the gears with several teeth on each side. The logo shows just 4 teeth per gear.
Jim Y
Jeff <jeff@NOSPAMmanicwave.com> wrote in message news:nofbb.1101$og4.923@twister.southeast.rr.com...
[quote:a275ffb3ff]
In the book Five Hundred and Seven Mechanical Movements, Henry Brown shows a
diagram of two rectangular gears (drawing #30) that when meshed together
provide varying speed for the driven gear.
Anyone have any thoughts or references to a process for producing these
gears?
http://www.stirlingsouth.com/richard/develop/engines_under_development.htm
covers the design and fabrication of elliptical gears. Similar issues
I suspect.
From the drawing a least, it appears that each tooth is of consistent depth,
so treating it as circular wouldn't really get it.
Just curious.
-jeff
[/quote:a275ffb3ff] |
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| eromlignod |
| Posted: Tue Oct 14, 2003 11:34 am |
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"John Ziavras" <john.ziavras4@verizon.net> wrote in message news:<SdNib.13366$Ks5.9139@nwrddc02.gnilink.net>...
[quote:889ec4cf35]I think the profile you described is called Cycloidal.
Epicyclic refers to a gear train.
[/quote:889ec4cf35]
No. A cycloid is a path generated by a circle on a straight line. An
epicycloid is a path generated by a circle on a circle, which is how
this tooth profile is produced. They have always been called
epicyclic gears. Open up a book on gears some time.
Don |
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| zumba |
| Posted: Fri Jul 23, 2004 3:38 pm |
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| duko |
| Posted: Sun Aug 15, 2004 6:27 pm |
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| zumba |
| Posted: Mon Nov 15, 2004 8:11 am |
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