Subject:
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Re: I wish Lego made an "Anti-Backlash Gear"
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Newsgroups:
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lugnet.robotics, lugnet.technic
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Date:
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Thu, 5 Apr 2001 00:24:17 GMT
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136 times
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> Tech question for us: Any body know what an Anti-Backlash gear
> is? If Lego made one, we would all have super precise Robots and
> mechanisisms! BERG carries them... Anybody know what I'm talking
> about?
I know of 1 type of zero-lash/anti backlash geartrain.
It's hard to put it in words but I'll try. My example assumes there
are only 2 shafts but it can be applied to as many shafts as you
need.
In my example S1 represents our first shaft. Drive or driven, you
choose. result is the same. S2 represents the other shaft in our
gear train. G1and G2 are 2 separate gears on S1, and they are both
in mesh with G3 which is located on S2. G2 is not splined to S1 like
G1 is, and is only there to act with the spring to remove the lash.
Now.... Our first gear is actually 2 thin gears (G1 and G2)
together on the same shaft (S1), working as 1 gear... mating to a
single thicker gear (G3) with a torsional spring force causing G1 and
G2 to rotate in opposing directions, except the teeth of G3 stop them
from rotating more than the lash between the G1/G2 pair and G3.
Really the G1/G2 pair is acting a variable pitch gear that perfectly
mates to G3 at all times.
If the force required to move the load is more than the spring
force between G1 and G2 there can be lash in this setup. In the
real-world application where I have seen this used (Toyota 3.4 V6
engine, to mate the two camshafts located in each cylinder head) there
is a way to lock G1 and G2 together before you separate them from G3.
I assume this is because the spring is so strong that it would be hard
to rewind in the field.
Thomas
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41 Messages in This Thread: ![I wish Lego made an "Anti-Backlash Gear" -Eric Sophie (3-Apr-01 to lugnet.robotics, lugnet.technic)](/news/x.gif) ![](/news/246.gif) ![Re: I wish Lego made an "Anti-Backlash Gear" -Ram Meenakshisundaram (3-Apr-01 to lugnet.robotics, lugnet.technic)](/news/x.gif) ![](/news/246.gif) ![Re: I wish Lego made an "Anti-Backlash Gear" -lego-robotics@crynwr.com (Chris 'Xenon' Hanson) (3-Apr-01 to lugnet.robotics)](/news/x.gif) ![](/news/46.gif) ![Re: I wish Lego made an "Anti-Backlash Gear" -Eric Sophie (4-Apr-01 to lugnet.robotics)](/news/x.gif) ![](/news/246.gif) ![Re: I wish Lego made an "Anti-Backlash Gear" -lego-robotics@crynwr.com (Steve Baker) (4-Apr-01 to lugnet.robotics)](/news/x.gif) ![](/news/246.gif) ![Re: I wish Lego made an "Anti-Backlash Gear" -Micah J. Mabelitini (4-Apr-01 to lugnet.robotics)](/news/x.gif) ![](/news/46.gif) ![Re: I wish Lego made an "Anti-Backlash Gear" -Eric Sophie (4-Apr-01 to lugnet.robotics)](/news/x.gif)
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![](/news/x.gif) ![](/news/28.gif) ![](/news/x.gif) ![](/news/28.gif) ![](/news/x.gif) ![](/news/x.gif) ![](/news/68.gif) ![Re: I wish Lego made an "Anti-Backlash Gear" -Iain Hendry (4-Apr-01 to lugnet.robotics)](/news/x.gif)
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![](/news/x.gif) ![](/news/28.gif) ![](/news/x.gif) ![](/news/x.gif) ![](/news/68.gif) ![Re: I wish Lego made an "Anti-Backlash Gear" -Eric Sophie (5-Apr-01 to lugnet.robotics, lugnet.technic)](/news/x.gif) ![](/news/46.gif) ![Re: I wish Lego made an "Anti-Backlash Gear" -Steve Lane (5-Apr-01 to lugnet.robotics, lugnet.technic)](/news/x.gif) ![](/news/46.gif) ![Re: I wish Lego made an "Anti-Backlash Gear" -Eric Sophie (5-Apr-01 to lugnet.robotics, lugnet.technic)](/news/x.gif) ![](/news/46.gif) ![Re: I wish Lego made an "Anti-Backlash Gear" -Jerry Kalpin (5-Apr-01 to lugnet.robotics, lugnet.technic)](/news/x.gif) ![](/news/246.gif) ![Re: I wish Lego made an "Anti-Backlash Gear" -Dean Hystad (5-Apr-01 to lugnet.robotics, lugnet.technic)](/news/x.gif) ![](/news/246.gif) ![Re: I wish Lego made an "Anti-Backlash Gear" -Jerry Kalpin (5-Apr-01 to lugnet.robotics, lugnet.technic)](/news/x.gif) ![](/news/46.gif) ![Re: I wish Lego made an "Anti-Backlash Gear" -Dean Hystad (5-Apr-01 to lugnet.robotics, lugnet.technic)](/news/x.gif) ![](/news/46.gif) ![RE: I wish Lego made an "Anti-Backlash Gear" -lego-robotics@crynwr.com (Tilman Sporkert) (6-Apr-01 to lugnet.robotics)](/news/x.gif) ![](/news/46.gif) ![Re: I wish Lego made an "Anti-Backlash Gear" -Eric Sophie (6-Apr-01 to lugnet.robotics)](/news/x.gif) ![](/news/46.gif) ![Re: I wish Lego made an "Anti-Backlash Gear" -Dean Hystad (6-Apr-01 to lugnet.robotics)](/news/x.gif) ![](/news/46.gif) ![Re: I wish Lego made an "Anti-Backlash Gear" -Eric Sophie (9-Apr-01 to lugnet.robotics)](/news/x.gif) ![](/news/246.gif) ![Re: I wish Lego made an "Anti-Backlash Gear" -Dean Hystad (9-Apr-01 to lugnet.robotics)](/news/x.gif) ![](/news/46.gif) ![Re: I wish Lego made an "Anti-Backlash Gear" -Eric Sophie (9-Apr-01 to lugnet.robotics)](/news/x.gif)
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![](/news/x.gif) ![](/news/28.gif) ![](/news/x.gif) ![](/news/28.gif) ![](/news/x.gif) ![](/news/68.gif) ![Re: I wish Lego made an "Anti-Backlash Gear" -James Powell (5-Apr-01 to lugnet.robotics, lugnet.technic)](/news/x.gif)
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![](/news/x.gif) ![](/news/28.gif) ![](/news/x.gif) ![](/news/68.gif) ![Re: I wish Lego made an "Anti-Backlash Gear" -Jonathan Wilson (4-Apr-01 to lugnet.robotics, lugnet.technic)](/news/x.gif) ![](/news/246.gif) ![Re: I wish Lego made an "Anti-Backlash Gear" -Ross Crawford (4-Apr-01 to lugnet.robotics, lugnet.technic)](/news/x.gif)
![](/news/x.gif) ![](/news/28.gif) ![](/news/x.gif) ![](/news/x.gif) ![](/news/68.gif) ![Re: I wish Lego made an "Anti-Backlash Gear" -lego-robotics@crynwr.com (Brian Dichter) (4-Apr-01 to lugnet.robotics)](/news/x.gif)
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