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WORLDFLIGHT 2019 - TEAM USA SUPPORTERS (HERO'S)

 
Worldflight 2019
Donations Starting Early
With 50 Days Left, it's time to start Counting Down to Worldflight 2019.  Beginning in August, we had 2 kind gentleman lead the way on our quest for donations to this amazing Charity Event.  Over the Past 6 Years, we (This community) Has helped to raise over $25,000.00USD to help the kids and their families of the All Children's Hospital in St. Petersburgh, Florida.  Kicking off the donations this year these Two Hero's are leading the way to another Successful Year.  I personally want to thank these two Gentleman and use this opportunity to have all of you donate to our wonderful cause. 
Thank you in advance for your help and please wish us much success for our 2019 event.
       
  ---Worldflight 2019 HEROS---

 James Williams, Warren Soeldner,  Sam Llorca, Doug Snow, Ryan O'Keefe, Edwin Burton, Vincent Thomas, Fred Kurasiewicz       





Thanks to all of you, You are all helping to make Worldflight 2019 a success..
Because of all you wonderful people so far we have raised a total of:

$2745.00 USD


Author Topic: Rack and Spur Gear - Help with Maths!  (Read 688 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
| FSX | FDS-MIP OVRHD SYS CARDS FC1| PM | PMDG 737-700 | UTX | GEX | UT7 | ASE | REX2 | AES | TSR | IS | TOPCAT | AvilaSoft EFB | OC CARDS & OVRHD GAUGES| SIMKITS | SW 3D Lights | FS2CREW2010 | FSXPassengers | Flight1 AE | MATROX TH2GO-D | NTHUSIM | 3-Mits EW230Ust Proj |

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
Boeing 737NG using Prepar3D v3.35, Prosim737, FDS SYS cards, FDS CDUs, CP Flight EL MCP & EFIS & Aerosim Solutions hardware of course!
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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.
Trev 
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