ursus-habilis t1_itq09ap wrote
Taking a practical engineer's approach - what accuracy do you actually need? You may find the difference between the actual length and the measured length after stretching and increased spool circumference is largely irrelevant. Or you can apply a conversion factor after the event to get 'close enough'.
Alternativel, an idea out of left field... could you find a way to precisely weigh the spool and calculate the mass of added thread, assuming you know the weight of a reference length of the thread to then convert it to a length?
Idontknowhowtobeanon t1_itqusao wrote
This is also a good solution, threads are often sold in weights which literally is the weight for a given length. Issue could be precision scales but depending on how froggy op is feeling, you can make a very precise and accurate scale with a strain gauge and a cantilevered beam. Full disclosure: didn’t watch this video, I’m at work.
Lazysailor12 t1_itt8foe wrote
This is most logical to me if you don’t need absolute accuracy. If you wanted more precision you should also be reasonably able to estimate the spool circumference increase in relation to the length (after x revolutions, increase diameter by y). Yes this is not perfect as diameter will require increasingly quantities to “grow” but.. close enough?
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