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Discuss any sort of mechanical stuff here: positioning systems, gears, extruding methods, etc.
Re: what is the performance? Where's the limit - 16 years ago
If you're using a stepperdriver which supports quarterstepping (or other modes of microstepping), it is probably pretty easy to increase the resolution of the XYZ drive system. I suppose this is easily adjustable in sofware.by TomNagel - General
Re: Dither Stepping - avoiding midspeed resonance - 16 years ago
Under certain circumstances it is impossible to accelerate a steppermotor past a certain speed because of resonances. This speed is well in the region that can only be reached by acceleration (above the pull-in curve). Where I work, we noticed these resonances can be dampened by attaching the stepper *not* directly to the frame, but via a damper-ring, which gives the housing of the motor a slightby TomNagel - Mechanics
Re: what makes a good extruder? - 16 years ago
Why is a heavy stepper a problem? If the extruder doesn't move, it does not really matter how heavy it is, or does it? While I write this, I realize this touches the basic design (architecure?) of the Reprap. I have not been able to find the "design document" in which design choices are motivated. For example: in the Darwin Reprap, I believe the extruder moves in X and Y direction, and the tableby TomNagel - Mechanics
Re: what is the performance? Where's the limit - 16 years ago
Forrest Higgs Wrote: ------------------------------------------------------- > TomNagel Wrote: > -------------------------------------------------- > ----- > > * How well do the printed parts follow the 3D > > design? > > depends on how well you design them. > Can you explain this a little further? How does the design influence the precision with which it is madby TomNagel - General
what makes a good extruder? - 16 years ago
I've been reading about the extruder. I've seen designs with a DC motor, and I've seen designs with a stepper. I cannot find any discussion about drive strategy. I'm interested in that. What are the requirements to the drive part of the extruder? I guess that a good extruder gives an exact amount of molten material per time-unit. Since the width of the output is only determined by the size of thby TomNagel - Mechanics
Re: Extruder motor replacement - 16 years ago
@jonwise I am new here, so I am not too familiar with specifics of the Reprap and its motors, but I do know a lot about motors in general (steppers and DC motors). I don't understand that you say "It naturally runs much faster and, slowing it down to an appropriate speed, the torque is too low." Torque delivered by a dc motor is linear to the current that you drive it with. If you experience theby TomNagel - Mechanics
what is the performance? Where's the limit - 16 years ago
I've been reading on the Reprap for a few hours now, and I have not found anything yet on the limits of the Reprap. * What is the resolution with which the parts are printed? * How well do the printed parts follow the 3D design? * What limits the above? * how fast can the Reprap print? * and what limits this? I have the impression that the focus of improvement by the contributors of this projecby TomNagel - General