Because my Z axis is a bit wobbly Id like to change the rods from 8 to 12mm which is fine and will works, no worries there.
The thing is ive got two Z-Motors and two trapezoidal screws with 2mm pitch and brass nuts for them. If I move faster than 2mm a second the screws jam and only one motor moves further.
Its not the Z-Axis that causes problems here its more like the friction of the screw/nut. Do you have recommendations on what screw to use? IGUS has some nice high-pitch-screws like 5mm and more. Has anyone tried them?
What screws do you use? Id like to have less play in them too!
Sounds like an overconstrained Z stage. Why are there 2 motors? That problem has already been identified with the age old Reprap Darwin and nobody repeated it since.
I had a similar issue with the 1mm pitch screw I put on the latest FB2020. I’m so used to the speed of the TR8 leadscrews, and could move them at 20mm/s the 1mm pitch I’ve had to reduce that down to 7mm/s and it was skipping and not moving at that until I turned the voltage on the stepper driver up from ~0.8v to 1v. Going by what I’ve found, finer pitch lead screws need more torque, so it may be worth looking at that.
Weird, the finer pitch screws should give you more axial force for the same motor torque. Are they lubricated well? I’ve been using light weight oil on my 2mm lead screws, but I don’t go very fast.
There’s a guy on here with a Delta driven with lead screws, they move pretty fast. It looks like a pretty steep thread pitch.
Hi. I have IGUS SLW Drylin 1040 for Z axis with 2mm pitch screw. I had similar problem with losing steps. Try to run 4-5mm/s and rise the jerk. Maybe acceleration but I’m not sure now. Like +Geoffrey Forest said use lubricant.
Is your Z and motors on either side of the print bed. Maybe a pic. I have 2 a motors and swiched from 8 - 12mm rods but had to make other chamges to stop the wobble. In the end I moved the rods and screws as close together as I could. Single rod on either side. It’s 100x better.
I got rid of that problem by either running 2 separate stepper drivers (RAMPS board has a spot for a spare driver) or running the motors in series rather than the default parallel using a single driver (got 2 printers, one uses one way, other uses the other way).
Yeah I use light oil. First ive tried ptfegrease which was bad. Ive got X on Z axis not bed on Z.
And my motors are in series. Extra made a pcb for it to keep it clean
Maybe its just to sloppy. The screws seem to resonate and shake and then one stops. Could use some tuning there. Ive found igus nuts for leadscrews and will get those. Maybe someone got a pic of the screw and nut?
