Thanks to the recent group buy via Sprit (
), I now have additional strength springs to play with in MX Clear switches. As part of that testing, I played with the nickel test to check the force required to activate the clear with each of the the various springs in them. Since each nickel weighs 5 grams, I paid close attention to how easily the switch would activate or nearly activate as each nickel was added. That allowed me to estimate how closely the switch activated to the actual weight of the coins and get a finer result than simply a 5 gram range. (Yes, still not excellent, but bear with me.)
So here are my results:
Stock spring: 14 nickels, estimated 67g
65g spring: 13 nickels, estimated 61g
62g spring: 12 nickels, estimated 56g
Blue spring: 12 nickels, estimated 56g
60g spring: 12 nickels, estimated 58g
55g spring: 11 nickels, estimated 54g
This is pretty much as I expected given that the spring the slider rides against to give tactility adds force of its own, with the exception of the 60g spring. Look at the list again and compare the 60g spring to the 62g spring. The activation force is actually
higher for the 60g spring than the 62g. That, I did
not expect!
I thought maybe I had mixed up the springs, but I was really careful in keeping track and labelling which springs I used. By testing how much force it takes to settle the slider just prior to activation, I was able to confirm that I did not mix up the springs (and neither did Sprit). I also tested multiple switches in both weights in case it was variances within the assemblies. The result was consistent.
Along the way, I also learned that a penny weighs 2.5g and a dime weighs 2.268g, which adds a little more precision to the testing. Using this information, I was able to confirm that the MX Clear with a 60g spring requires a higher force to activate than the same switch with a 62g spring. Both can hold 11 nickels without activating. Both activate with 11 nickels plus a penny. But the 60g will hold 11 nickels plus a dime, where the 62 g version will always activate.
That's a rather counter-intuitive result. Any ideas why?