Calibrating A axis

Thank you to everyone who dealt with my problem homing, we are now up and running and calibrated on X, Y and Z axis. My question here is the A axis and Scale in the ini file, i really do not want to back into stepconf as it wipes out everything i have altered in the ini and i have to start from scratch, which is frustrating lol)
Our rotary axis is a small one for making my wood jewellery, it has a ratio of 4:1 and we run on 8 microstepping we worked the steps out to be 17.78 but i don't think this is what i put in the scale on the ini file, or is it????
Could anyone who runs a 4th axis give us any information on this as we are used to Mach4 and have only just started with LinuxCNC, any info is usefull such as calibration and how you do it, working out the steps per degree (just in case we have done that wrong) would greatly appreciste the help

For a rotary axis the Scale is in steps/degree.

So I assume a stepper motor with 200 steps/360°
with 8x microstepping that would be 1600 steps/360°
with ratio 4:1 that would be 6400 steps/360°
so your scale = 17.7778 seems correct to me.

great do i put this in the ini file under scale ??

If you have used the PnC-Configurator to create the config then its called 'STEP_SCALE' , in the relevant [JOINT_n] section. (Presumably [JOINT_3])

Mae22 wrote:

Thank you to everyone who dealt with my problem homing, we are now up and running and calibrated on X, Y and Z axis. My question here is the A axis and Scale in the ini file, i really do not want to back into stepconf as it wipes out everything i have altered in the ini and i have to start from scratch, which is frustrating lol)
Our rotary axis is a small one for making my wood jewellery, it has a ratio of 4:1 and we run on 8 microstepping we worked the steps out to be 17.78 but i don't think this is what i put in the scale on the ini file, or is it????
Could anyone who runs a 4th axis give us any information on this as we are used to Mach4 and have only just started with LinuxCNC, any info is usefull such as calibration and how you do it, working out the steps per degree (just in case we have done that wrong) would greatly appreciste the help snow rider

Great to hear you have your X, Y, and Z axes up and running! When setting up the A-axis (rotary axis) in LinuxCNC, particularly when switching from Mach4, the key is ensuring that your steps per degree (or per rotation) are properly calculated and input into the file under the setting for the A-axis. 

We could do with speeding up the axis as they are quite slow, I’m assuming it’s velocity or acceleration could you confirm where I’m looking in the ini or Hal files
Many thanks

Seems like this could be of interest:
linuxcnc.org/docs/html/config/ini-config...ub:ini:sec:joint-num

forum.linuxcnc.org/27-driver-boards/47739-step-unit-calculator

excel tab for calculate steps`` maybe it can help.