Hi all
Been thinking and there is a simpler way to tension a 4x6's blade that everyone can do at no cost, all it needs is a cellphone.
I've made 30sec audio files of a properly tensioned10-14TPI?blade being plucked every 2-3sec.? The 1st file is the blade tensioned?to 22500psi stress for bimetal, the other to 17500psi? stress for carbon steel blades.
Load the files?on your cell phone.
Tension up the blade until the sounds match when you pluck the?back run of the blade. I used the flesh of my thumb or finger, not the nail, as the nail makes a sound that is harder to match.
It's?better than using an App or formula to?work out a frequency and matching to a pure MIDI tone - this is the actual sound of a?blade, at known tension, set with a calibrated loadcell.
Its a bit hard on your fingers so a couple of painless alternatives, that can be used to re-tension the blade, are given.??
This method also provides a way for anyone to calibrate the cheap Chinese ZTTO TC-1 spoke tension meter,?without needing to compare it to a Park Tool.?
I've written out the methods and posted them to the Files section too, along with the audio files. The 3 files are in a single folder called 'Blade tensioning methods' so that they'll be together- jv
John Vreede