@ nicholas.seward tks for your comments.
It was explained to me that when the nozzle is centered between two arms (i.e. coplanar) there will be a singularity, is that what you mean?
I can see that being a very plausible causation of the up/dn movement.
I think your example is based in the Z axis?Quote
nicholas.seward
Simpson/GDR have a real bad singularity when the hub attachment point and the shoulder joints are coplanar.
It was explained to me that when the nozzle is centered between two arms (i.e. coplanar) there will be a singularity, is that what you mean?
Do you mean if the motor mount brackets are loose or flexing?Quote
nicholas.seward
Any stepper rotation could result in the effector going up or down depending on gravity.
I can see that being a very plausible causation of the up/dn movement.