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Rack and Spur Gear - Help with Maths!

Started by RPPerry3, January 25, 2019, 08:05:55 AM

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RPPerry3

January 25, 2019, 08:05:55 AM Last Edit: January 25, 2019, 08:20:54 AM by RPPerry3
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.




navymustang

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.
My 737-800 full-scale cockpit has been sold. Now onto my full-size military helicopter project. 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.

Trevor Hale

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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blueskydriver

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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Aerosim Solutions

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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Trevor Hale

Quote from: Aerosim Solutions on January 29, 2019, 04:17:43 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
Gwyn, This is amazing.. you described it perfectly.  Thank you.
Trev 
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RPPerry3

I know this is very late, but thank you to all who replied.  I had to drop the project.  It was a quiet Sunday afternoon and my wife ran down the stairs waiving the magic wand of disappearing.. . it had two "++" symbols.  Meaning my space for a cockpit and funds would now belong to my (now 2 year old) baby girl.  I couldn't be happier being her daddy and I'm now able to get back into building a cockpit of sorts, but the 738 is far outside the budget and room so I'm considering my second favorite aircraft KA350. 

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