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By: MrRoboSteve
New: 15-02-2015 15:45
Updated: 15-02-2015 15:45
Views: 1460 times
This is the servo operated dog gear mechanism we designed to prevent back driving our tower winch.
Discussion
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15-02-2015 16:25
MrRoboSteve
Re: pic: 3081 servo operated dog gear
Here's the first winch our team has built that includes a dog gear mechanism to prevent back driving. We're using a servo to actuate the dog. It took about 2 hours to build the servo attachment.
Parts:
Toughbox
.090 aluminum sheet to attach servo
servo
.500x.750 aluminum bar
.125x.750 aluminum bar
AndyMark AM-0096A hubs
15-02-2015 18:58
TylerS
Re: pic: 3081 servo operated dog gear
Do you have the servo move the bar out of the way whenever you are moving the to drum?
15-02-2015 19:31
Jonathan Cheng
Re: pic: 3081 servo operated dog gear
How well does it disengage under high loads?
15-02-2015 22:24
Alan Anderson
Re: pic: 3081 servo operated dog gear
What does the servo actuate, and what does the dog gear engage with? I see what looks like it might be a ratchet, but I can't tell how it would let the teeth move in either direction.
15-02-2015 23:23
Camren
Re: pic: 3081 servo operated dog gear
It is pretty simple, there is a spring that holds the locking mechanism in place, and as the spindle is spun the lock positions itself in the gear. Then when we want to unwind the spindle. The motor spins just slightly to release the tension on the lock, and then the servo moves the lock into a neutral position allowing the spindle to unwind.
15-02-2015 23:27
Oblarg
Re: pic: 3081 servo operated dog gear
Having used (and eaten through) hand-made ratchets before, the one suggestion I have is to keep an eye out for wear and have plenty of spares.
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