MASSO
MASSO Documentation
5 Axis
Rotary axis settings are angular and not linear. There is no advantage to using huge step rates with large
gear ratios. Breaking one rotation into a million steps will not help accuracy and give you a rotary axis that is
slow. A value of 8000 to 10000 Pulses per revolution should be more than enough for most applications.
Only when you are turning huge diameters 1 or 2 metres in diameter will you benefit from large Drive: Pulse
per Revolution rates.
INFORMATION: Make your Motor: Degrees per revolution = 360 and this way you will always get
a whole number for the Drive: Pulses per revolution. It is also easier to calculate and will make
more sense when you are reading it.
How to Calculate Rotary axis settings
Gather the following information:
The number of steps per revolution of your motor. For example most steppers are 1.8 deg motors with 200
steps.
The gearing reduction ratio between the stepper and the rotary axis output. If you do not have any gearing
the ration is 1.
Microstepping set on your motor drive.
Calculate pulses per revolution as follows:
Motor: Degrees per revolution = 360
Drive: Pulses per Revolution = Motor steps per revolution x Gearing x Microstepping
Maximum Feedrate = 2,052,000,000 / Drive: Pulses per Revolution
Please note that this is a maximum value but your drive motor may not be physically run at this
feedrate so please set this value according to your machine's capabilities.
Acceleration = This value will depend on your machine’s drives and cannot be calculated. These are
found by actual testing on your machine.
Maximum and Minimum Travel = If this is a Mill Rotary 4th axis by setting large maximum and
minimum travel will allow you to use it like a wood lathe and sand your masterpiece if your machined
part is suitably shaped and your maximum feedrate is fast enough..
Maximum and Minimum Travel = If this rotary axis is used as part of a 5 axis machine you may
need to limit the travel of the axis to prevent it running into hard stops. Set the travel values
accordingly.
Backlash = Measure and set according to your machine's measured backlash.
WARNING: Always calculate the rotary axis setting. Do not run axis calibration. Unlike a linear axis
which can vary due to component tolerances, a rotary axis will always calculate accurately.
v5.18 - 08 Apr,2021
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