Do it exist any way change the sync between axis?

[Axel-H]

I have run into a interesting problem where the Y axis change direction a fraction of a second later than the X axis creating ovals that have its long axis instead of being at 0° and 180°(or 90° and 270°) the long axis are on 110° and 290°, Y also have a flat area from 90 and 270 toward 110° and 290° but not before 90 and 270.

I hope that description makes sense. In reality the issue is because of friction in Y byt if any way to change the timing between Y and X exist I would be interested to know about it as I suspect knowing about something like that will be useful sooner or later and might solve this problem until I have the ability to rebuild the Y transfer.
The machine is a Cartesian and the X band is direct drive but the 2 Y bands are connected to a shared axis that is driven by motor connected to it by a band.

I have locked into the m596 and M670 but can't make heads or tails of if any of those commands could do that.

I run a duet wifi on this machine but I also have a duet 3 in an other machine.

[dc42]

@axel-h the usual cause of that type of problem is backlash in one of the axes. Common causes are a loose belt or a loose pulley.

[Axel-H]

@dc42
yeah.
That was the first I checked, all the pulleys are well attached and all belts are tight.

I suspect the problem is in the end that the Gates power grip gt belts stretches just a little bit when changing directions.
As the weight in the Y carriage is substantial and I likely have too much friction in it that I need to remove by rebuilding the gantry.
The problem is that I won't have time to do that rebuild for a while so I was looking if any solution exist that I can use in the meantime

[dc42]

@axel-h said in Do it exist any way change the sync between axis?:

I suspect the problem is in the end that the Gates power grip gt belts stretches just a little bit when changing directions.

I would be surprised f they stretch enough to cause a visible effect. If they did, I would expect many more users to report this.

Does increasing the motor current help, if you are not already close to the motor or driver current limits?

[Axel-H]

@dc42
The drivers are set to 1500mA (12v) and while the drivers could take more I am not comfortable running the motor at much more.

I suspect the real cause of the problem is the 8mm Y transfer axel instead of the 5mm that is usually used and the Iglidur G bearings don't like the kind of transverse load that the bands put it under.
I hope to be able to replace the Iglidur with roller bearings soon as that will likely solve the problem for real.