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The material is cloth with a teflon type coating sprayed on to it. I have thought about running it through a set of pinch rollers to guage the speed, but am unsure what to use as a feedback. A tach would not put out any voltage at such low rpm unless we greatly geared it up.
I have a 90VDC motor and gearbox running a spool at 1 RPM. Empty the spool is 4" in diameter. It has an aproximate linear speed of 12 inches per minute (pi X diameter). Full, the spool will be 16" in diameter (approximaely 48 inches per minute). So as the spool takes up more material its...
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