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Sounds like your spoke tensions were too high for the rim. We're you using a tensiometer or just feel?
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What could be the issue? Was that last half turn of tensioning too much maybe?
Yup, it's a thing:
https://www.google.com/search?q=pringle+during+tensioning -
You took the tension too far. Read the PhD by matt Ford for a full explanation. You found the critical tension for that rim beyond which it will never be true. The physics is fascinating.
Brommers
gbj_tester
cycleclinic
@MCamb
Can someone help me diagnose an issue?
Building a wheel, everything going dandy.
Get it nice and true / round so decide to do a another round of tensioning (quite high already so just do a half turn all the way round)
Put the wheel back in the stand and it’s super wobbly, seemingly in an opposite manner to what the spoke tensions suggest, (so rim is leaning away from a tight spoke). Spoke tension becomes erratic too, fairly even before then all over the place
Think ok gunna try and l release some wind up, maybe that’ll sort it. Put it back in the stand, no difference.
Continue truing, getting it pretty good then a spoke snaps, roughly where it’s butted at the end closest to the shoulder.
What could be the issue? Was that last half turn of tensioning too much maybe?