Tech_Marco wrote: If it worked out that way, that means something wrong with the machine itself, but not the DSP card (software and hardware). The making a 90 degree turn, the momentun from the motor is the greatest as it need to stop and lock itself quick then turn. The motor seems losing step and the only thing that it come to my mind is either the motor is bad or the current is low. Just my though
Yes, I agree completely with you - the belts just need to be taut, not tight (if you get my drift
I did some more testing late last night and changed the rectangular 'snake' for a snake made from arcs - problem showed up right away - at the start of a run - any direction, the arc was flat at the start - a sure sign of backlash.
I'm certain it's not mechanical backlash 'though, as my setup is extremely smooth and tight (I even tightened it up to 'naPS tight' LOL) - there is no problem in X - it uses a nema17 size motor for weight. I have a hi-torque nema23 in Y - however, the stepper drivers are keling 4020's - max 2A - I have the Y cranked up to max current, but perhaps I am asking too much of the wee 4020 and need something with a touch more 'beef'. The steppers are both brand new and seem to operate correctly, hold position well etc. They both run fairly warm as expected.
It has no problem moving the stage around. I wound all the speed an acceleration values right down to see if it would help, but it hasn't.
I'm going to order a new stepper driver with double the current and see where that leads ...
As an aside, artofmystate(Reuben) pm'd me his data - all cut perfectly (apart from my slight backlash issue) - nothing like his own results - hopefully he will get that sorted too.
I think I've convinced myself that it's not the LO controller, but I'm still going to swap it out for the lasersaur to try while waiting on the driver (painful
Watch this space as they say.