Centroid Community CNC Support Forum

I received my Acorn and NUC yesterday and all is connected on the bench and
running the bench test nicely. In looking at the axis configuration in the wizard,
I note that it wants steps/rev and overall turns ratio. My router uses belt drive
for the X and Y axes and a ball screw for the Z. Coming from the mach 3 world,
all the calculations are in steps/inch. X is 2142.408 step/inch. Y is 3079.141 step/inch.
The Z axis has a 4mm ball screw . How do I get from steps/inch to what the wizard wants ?
Larry

Larry..
Easy way would be if you know your current steps per inch and Drive microstep settings.

For example: 2142.408 / 1600 = 1.339005 revs per inch (drive set at 1/8 microsteps)

Hows that?

Hi Gary
Thanks for the reply. I posted before thinking the thing all the way through. My bad.
The X and Y axes are timing belt driven and have two stages of pulley reduction from motor to the final drive pulley.
The encoder is on the intermediate pulley. The inch per rev of the final drive pulley is known and the pulley ratios
are known so it becomes inch/rev/drive pulley times reduction ratio divided by encoder lines. This should
get me close enough to tweak it in by measurement when I get it all together.
Larry

You may have to forego the encoder inputs with the acorn, unless they interface with your drives.

For the ballscrew the setting would be 1mm = 0.03937 * 4 = 0.15748 inches per rev

I am using GECKO 320 servo amps and the encoders go back to the drives.
On the 4 mm Z axis, I overdrive the screw by a 30/22 ratio to speed things up a bit.
The motor has a 2000 count encoder.
Any progress on your 4th axis ?
Larry

Larry...
The only progress is that I have received notice that the parts have shipped, hopefully next week they will be here