Over the last couple of days I had to replace both of my Y axis belts - one snapped and the other had a crook in it. So I was thinking about setting the belt tension and how it would be good to match them to each other. I got the idea from the instructions “Tighten the nut until the belt is taut and you can pluck it like a loose guitar string” that maybe a great way to set the tension would be by plucking them and adjusting until the notes match. I someone with a known correct belt tension were to make a video plucking them, then others could use that as a reference for setting theirs.
Here is a video of plucking my belts I don’t know how correct my belt tension is, but I think it may be pretty good. If the idea works then it could be added to the assembly instructions and save a lot of uncertainty for builders.
I tune mine by ear but just for the heck of it I clipped one of my $10 guitar tuners to the Y gantry. The tuner says my belt is between a C# and a low D note. Though that will depend greatly on how long the belt is between the clip and the first roller wheel. Edit: took a tuner app on my Android phone. I’m running about 70hz with the gantry all the way back on a 1000mm XCarve. I have no idea whether that’s too loose or tight but have yet to miss a step or break a belt.