Can someone look at my speed chart, and walk me through the speeds. I am believing the chart is way off. Supposed to be a 12 speed lathe and yet only 4 speeds are useable.

Here are the givens: motor 1725rpm

motor 2 step pulley 2 1/4 and 2 3/4 dia

countershaft pulley 6" and 6 3/8"

slow speed step is 2 1/4 & 6 3/8

fast step is 2 3/4 & 6"

Spindle countershaft steps are 3"-4"-5", this yeilds ratios of 1.66:1, 1:1, .6:1 ,correct?

I have no interest in accuracy out to decimals places to right of the decimal point nor perfected pitch diameter of V groove. All of these are V-groove

I am suspect that the chart is off by 3 places left of decimal point. (hundreds of rpm)