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Author Topic: Rack and Spur Gear - Help with Maths!  (Read 347 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
Please note that I am a self-employed professional cockpit builder that provides consulting to defense contractors and civilian schools and airlines.

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.



Trev
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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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