The result of your conversion between foot/second and milimeter/second appears here
To convert between Foot/second and Milimeter/second you have to do the following:
First divide .03048 / 0.001 = 30.48
Then multiply the amount of Foot/second you want to convert to Milimeter/second, use the chart below to guide you.
Symbol: ft/s
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Symbol: mm/s
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