Tweet
I can see I need to revisit this too. I messed with McMaster Carr today. They have no spring that is 2.5†relaxed, 1 inch in diameter that will stretch to 6â€.
A smaller diameter spring is the only option.
McMaster springs data shows that a springs wire diameter is a key design component. A smaller wire with more windings will give the spring more reach. Smaller wire will also decrease the springs Max load. So a spring wound with .075†wire will stretch farther than my spring with .105 “ wire but it’s Max load is less.
I will show some Spring data from MacMaster for a free length of 2.5†And 3†springs that will reach over 6 inches.
Spring Data is relaxed length followed with spring outside diameter, wire diameter, Max length, Max load, type of steel.
2.5†long, .500†OD, .045†wire, 7.44†max, 9.50 lb load, zinc plated music wire. https://www.mcmaster.com/9432k69
3.0†long, .625†OD, .062†wire, 7.27†Max, 20.0 lb load, zinc plated music wire. https://www.mcmaster.com/9432K119/
3.0†long, .750†OD, .075†wire, 6.00†max, 22.9 lb load, black oxide music wire. https://www.mcmaster.com/3114T114/
3.0†long, .750†OD, .075†wire, 6.78†max, 27.3 lb load, zinc plated music wire. https://www.mcmaster.com/9432k124
The most expensive option above was about $12 for 3 springs. Watch out for shipping charges at McMaster.
If a 3 inch spring is a bit long, then a bolt and fender washer works pretty good so it won’t sneak off the rudder pedal.
Cheers!
Comment