A Axis testing
#K40rotaryaxis
Front end 4.0.734
Back end 4.0.96
using Smoothieware
I have managed to do quite a bit of testing of the rotary axis today.
There seems to be a couple of issues I’m not sure they are all setup issues but may be some of them.
1 When running a job the Y axis beam does not move in to position set up on workspace. To get around this I have manually jogged to the center workspace position and then its in the right position to progress the job
Just to confirm… When testing without manually moving to workspace center the A axis rotates and the X axis moves to the X axis workspace position. The Y axis stays put and doesn’t move.
If you guys want a video then I will get one done, something I should have done when I was playing. 
2 When changing the cut speed, rerun the gcode generator the cut speed does not change. I have looked in my config file and it doesn’t appear to be restricted in there so could this be LW?
Thought I would put some feed back.
@Todd_Fleming I will check that out later and let you know.
@Todd_Fleming Checked it out and tester the rotary axis further today as had some play time.
F values were changing but the rotary didn’t seem to be keeping up with the settings as when the axis was doing more work the burning was much heavier and seemed to be only on the rotary points where it was stronger.
Where the x axis was doing most of the work it was looking much better.
Changed the settings in config file slowly to see what happened.
Increased Delta acceleration to 800 mm/sec2
Also increased delta Max rate to 10,000 mm/min
All now runs much smoother and responds better.
The stepper doesn’t seem to be getting much warmer in fact seems reasonable and stable.
The driver also seems to be holding the temps well.
So I will progress further and see how it goes.
Does anyone else see a problem with what I have changed?
Managed to engrave a wine glass tonight that is 85mm Diameter.
Its all preliminary “positioning” stuff at the moment, getting used to LW. Once I have an idea of how it looks I will set up a second sett of rollers to hold the workpiece in position better.
Once I get a decent video I will post it to show how its working.
Since it’s rotary, delta’s configuration units are deg/sec2 and deg/min. To convert that to what’s happening at the surface, multiply by PI * diameter / 360.
e.g., assuming your diameter is 30mm: 10,000 deg/min * 3.1415 * 30mm / 360deg = 2618 mm/min. This number must be at least your F value to prevent slowdowns.
@Todd_Fleming thanks, I believe the stepper stepping ratio is set up right.
See this thread
https://plus.google.com/106553391794996794059/posts/g2kLamgYEnc
When I have set a calibration file in to LW, set the diameter for A axis and run the file it’s within 0.3 mm of the diameter accuracy. That’s close enough for me.