How to spin a gear at a slower rate without a bigger gear?

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Discussion Overview

The discussion revolves around the challenge of spinning a small gear at a slower rate using a linear wire movement of 1 inch, specifically aiming for the gear to rotate 90 degrees for each inch of wire movement. Participants explore various mechanical solutions without resorting to using a larger gear.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant suggests using a system of pulleys or a lever to achieve the desired gear rotation.
  • Another participant questions whether a larger wheel on the same shaft as the small gear is an option, indicating a potential misunderstanding of the constraints.
  • A participant proposes a planetary gear set as a possible solution, noting its complexity and the challenge of understanding it.
  • Another participant mentions the use of planetary gears in model aircraft for their concentric shaft design, which allows for a reduced overall diameter.
  • A suggestion is made to consider a worm and wheel mechanism for achieving a significant reduction in speed.

Areas of Agreement / Disagreement

Participants present multiple competing views on how to achieve the desired gear movement, with no consensus reached on a single solution.

Contextual Notes

Participants express varying degrees of familiarity with the proposed mechanisms, and there are indications of space constraints influencing the design choices.

Who May Find This Useful

Individuals interested in mechanical engineering, gear systems, or those facing similar design challenges in constrained spaces may find this discussion beneficial.

kolleamm
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I have a linear wire that moves let's say a distance of 1 inch.
I would like this wire to spin a small gear (0.25 in circumference) 90 degrees for every 1 inch it moves. How can I accomplish this without using a bigger gear?

Any ideas are appreciated.

Thanks in advance
 
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kolleamm said:
I have a linear wire that moves let's say a distance of 1 inch.
I would like this wire to spin a small gear (0.25 in circumference) 90 degrees for every 1 inch it moves. How can I accomplish this without using a bigger gear?

Any ideas are appreciated.

Thanks in advance
It seems like you could do that with a system of pulleys or a lever.
 
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tnich said:
It seems like you could do that with a system of pulleys or a lever.
Thanks that might work
 
kolleamm said:
Thanks that might work
When you say "a bigger gear" are you ruling out putting a larger wheel on the same shaft as the small gear?
 
Depending on what end result you are after, a Planetary Gear set is one possibility. The drawback is they are a little complex, and it's hard to get your brain to grasp them.




Cheers,
Tom
 
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tnich said:
When you say "a bigger gear" are you ruling out putting a larger wheel on the same shaft as the small gear?
Basically I have a space constraint and having a big gear wouldn't allow things to fit, more smaller parts wouldn't be a problem though.
 
Planetary gears have been used by model aircraft flyers for many years. They have another advantage in that the shafts are concentric (no offset) so the overall diameter can be reduced so they fit more easily into the streamlined nose. Maxon make a good range of small gearboxes.
 
Worm and wheel? (Good for a big reduction.)
 
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Good ideas everyone! Thanks a lot!
 

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