Looks really cool - it saves me from having to go to SDP-SI to track down step files of sprocket geometry, which can be a pain sometimes. I also like the preview ability to see roughly the size of the sprocket.
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Originally Posted by ERothfus
For chain, we just used the "industry" designation of #25 and #35, which aren't really in inches.
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#25 chain is 1/4 inch pitch and #35 chain is 3/8 inch pitch exactly, which is what is used in industry.
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There is an "best" amount of slack for a chain that promotes the best wear on the teeth on the sprocket...
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Which is the exact center to center distance! If you ask sprocket/chain manufacturers, they'll tell you this. If you are just rounding to the nearest chain size, it will not work very well - the chain will jump, possibly coming off the sprocket or breaking teeth.
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Having said all of that, you can absolutely specify zero slack if you want, though you're likely to get just a bit of slack anyway since the chain length will likely be longer than the "ideal length" given that it must round up to the nearest whole link length. We have found that 1% is an appropriate target chain length, which is the program's default.
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How did you find that 1% was the right length? Also, when I choose 0% slack, it still gives me 3.598 slack (chain links) and tells me "Distance from Desired Slack (chain links)" is zero.