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Author Topic: Rack and Spur Gear - Help with Maths!  (Read 437 times)

Offline RPPerry3

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Rack and Spur Gear - Help with Maths!
« on: January 25, 2019, 12:05:55 PM »
I need help calculating the correct diameter of spur gear so that my potentiometer gets near 300 degrees rotation as it travels the length of a 300mm rack.

I'm building a custom flight yoke and this is for Yaw control.  As I push the yoke shaft in or pull back the carriage will have the Potentiometer with spur gear that rolls down the rack gear as input.



« Last Edit: January 25, 2019, 12:20:54 PM by RPPerry3 »

Offline navymustang

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Re: Rack and Spur Gear - Help with Maths!
« Reply #1 on: January 25, 2019, 01:44:11 PM »
I assume you meant pitch control  :)

Have you thought about using a string pot instead of the gear assembly you described. So much easier to build with.
Building a full scale 737-800 AATD for home use. Majority of hardware is from Sismo Solutions, software is Prosim under P3D. An AOPA member and LifeTime member of National Association of Flight Instructors
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Offline Trevor Hale

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Re: Rack and Spur Gear - Help with Maths!
« Reply #2 on: January 27, 2019, 08:36:45 AM »
You could also use a slide pot. That just slides in and out with the elevator pitch control


A lot less complicated.



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Offline blueskydriver

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Re: Rack and Spur Gear - Help with Maths!
« Reply #3 on: January 27, 2019, 01:34:02 PM »
Jim's suggestion is spot on. I've been using the same string pots for many years in my TQ. So, those would be great for a Yoke setup, or like Trevor suggests, the slide pots will work just as good... :idiot:

John
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Offline Aerosim Solutions

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Re: Rack and Spur Gear - Help with Maths!
« Reply #4 on: January 29, 2019, 08:17:43 PM »
Diameter would have to be 115mm

360/300(degree ratio) = 1.2

1.2 x 300mm = 360

360mm/Pi (3.142) = diameter 114.57mm

Cheers Gwyn
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Offline Trevor Hale

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Re: Rack and Spur Gear - Help with Maths!
« Reply #5 on: January 30, 2019, 06:15:05 AM »
Diameter would have to be 115mm

360/300(degree ratio) = 1.2

1.2 x 300mm = 360

360mm/Pi (3.142) = diameter 114.57mm

Cheers Gwyn
Gwyn, This is amazing.. you described it perfectly.  Thank you.
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