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« on: January 13, 2010, 02:52:58 AM »
Rich
Didnt know if the PP used Revs per Sec as per manual or Revs Per Min as per the SS. Actually the SS is supposed to be set up differently according to Greg but it seems to work the normal way. The way Greg says to set the SS up is Steps per is the max frequency, so for 2000line encoder servo that would be 2000 x 4 =8000 Then multiply by full speed so say 2000 in my case that would be 16,000,000 then divide by 60 to get the frequ it equals 266,666. The Vel is then set to 60. Seems a weird way to do it but it works just the same with the SS In the end the values work out the same as 8,000 Steps per x 2,000 Vel = 16,000,000 pulses and 266,666.666666666666666666666 x 60 = 16,000,000 pulses just one way is easier to work out than the other LOL
One other thing I have found out regards the SS which may or may not affect the PP is if you dont have the max pulley set to the max spindle speed it will need some crazy numbers in the steps per unit, seems the SS is also looking at that value and working things out from it and I have never heard Greg mention this or seen it written any place. No mention in the manual whether this is the case for the PP as far as I can see.
Steve, if your spindle is direct drive try 400 for steps per 150 for Vel (if thats what the max speed will be) and then the Accel will be set to suit depending on the ramp you want. If that is not giving you the correct values make sure you have the Pulley setup to your max speed of 150 with no ratio set and make sure pulley 1 is selected on the diagnostics page, not sure if this effects the parallel port but it definitely does for the SmoothStepper.
Hood