- #1
R4de0n
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Homework Statement
Hi, I am having a problem with calculating the proper sizes for a pulley.The pulleys are turning threaded bars and I want them to turn at different speeds. They are connected via a Belt. There are three pulleys arranged in a triangle. One is the driver pulley(Ø31mm) which I don't have a problem with... the one on the bottom right(Ø31mm) is the same size as the driver pulley, my problem is that I want to size the pulley on the left(Ø46mm) to turn about half as much as the the other driven pulley.
Originally I thought that a ratio of roughly 1:1.5 (31:46) would be ok, but I made the pulley and the difference in rotations did not appear to be 1:1.5.
I was hoping someone would be able to point out if I am missing something glaring. Any insight into how to calculate the proper size so that my threaded bars will turn at the above ratio would be much appreciated