Chasing an X vs Y movement issue on a DELTA....checking Steps/mm
I have been chasing a problem in the X-Y axis relationship on a delta printer...
By this I mean the actual Cartesian X and Y don't seem to be the same when commanded to move the same..
I am not 100% certain but I suspect after numerous test that maybe the towers' steps/mm are not identical. I see that there are settings for each in the firmware config tool, though they are labeled XYZ I think., while I refer to them as ABC. Can I alter one to correct if one moves differently from the other? I know in reading up on the subject that there was some discussion that they had to all have the same steps/mm setting even though the configurator uses multiple numbers. Does the system always use just one of the numbers when doing the math?
I am hoping to make a mechanical fix like a belt adjustment or something to correct my issue as it seems likely caused by mechanicals anyway but is there a software way of doing it or not?
Next question assuming all the columns are using one step/mm or they are all set the same can I assume that if I move the extruder down vertically from the home position a fixed amount I should see a identical motion at each tower...I don't expect it to be the same as the extruder move but I am assuming that the motion should be the same at each tower so I can measure and compare motion of the 3 cartridges on the rails. Is this a good way to measure the steps/mm or is there some other method that can be used? My guess is this might be a belt tension or pulley alignment thing...I have never found a definitive way to set belt tension the same or even how tight that tension should be.
Any help would be appreciated.