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# Question About Limiting the Angle Degree Change of a Gear?

04/01/2017 2:23 PM

I posted before and it was super helpful so thought I would try again. Undergrad

I have to make a completely mechanical design to complete motions. I've attached the photo. I need part A to turn to the right and with linkages B the gear will also turn. The thing I'm confused about is where I wrote "Bump" in read the linkages will bump into the surface I pointed out. So what Im wondering is what kind of mechanical mechanism can I add to part C to limit the amount of rotation my gear "A" can complete it it is turning. Im allowed to use a electric motor to power but only mechanical mechanisms. What can I add I cant just add a shaft that will continuously turn

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#1

### Re: Question about limiting the angle degree change of a gear?

04/01/2017 2:50 PM

You can have a nipple on the gear that catches a protuberance on the bracket...

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#3
In reply to #1

### Re: Question about limiting the angle degree change of a gear?

04/01/2017 4:36 PM

Right! Why would both of those be needed though Like wouldn't just the nipple or just the protuberance (stops) be enough?

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#5
In reply to #3

### Re: Question about limiting the angle degree change of a gear?

04/01/2017 7:04 PM

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#6
In reply to #5

### Re: Question about limiting the angle degree change of a gear?

04/02/2017 12:20 AM

Oh I see lol. Thanks for actually drawing that btw. Could the nipple be the linkage pins?

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#7
In reply to #6

### Re: Question about limiting the angle degree change of a gear?

04/02/2017 4:33 AM

Anything that works, I don't even know what you're building here....looks kinda like a scanner bed...In any case there is probably all sorts of ways to accomplish the desired outcome...you could probably use a linear actuator....or servo motors and micro-switches...or a solenoid braking system....

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#2

### Re: Question about limiting the angle degree change of a gear?

04/01/2017 3:57 PM

Why does the mechanism need to be on "C"?

It appears that links "B" will already limit how far the gears can turn. If that's true, maybe you could make the link connection point on the gear some type of variable position.

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#4
In reply to #2

### Re: Question about limiting the angle degree change of a gear?

04/01/2017 4:37 PM

I didn't think they would be strong enough to prevent excessive force and could break off

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#8

### Re: Question About Limiting the Angle Degree Change of a Gear?

04/02/2017 4:43 AM

What is driving what in this scenario? It seems too complex.

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