First Plot Results and How to resolve issues
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Hey Guys,
My first plot ==>
[img]https://i.imgur.com/2h4GoSA.jpg[/img]
Did a Generate Art / Hilbert Curve Fractal (order 6)
1.) It did not lift the pen after it finished the plot. (I have checked my pen up/down and calibrated its ok)
2.) there is a bow in the design more pronounced at the top compared to the bottomMy Specs
Nema 17 1.8/200
GT2 Belts / 16T PulleyRumba with Firmware v7.15.5
Running Software v7.16.1MW 537.0 (this is from the right end of pulley left to the left end of pulley right)
MH 470.0
Accel 2000, Draw Speed 2000.
PEN UP 180
PEN DOWN 120
LIFT DELAY 50A3 Paper Landscape
Firmware Details
// motor details
#define MICROSTEPS (16.0) // change this. microstepping on this microcontroller
#define DEGREES_PER_STEP ( 1.8) // change this. as advertised by the stepper motor maker#define NORMAL_MOTOR_STEPS (360.0/DEGREES_PER_STEP) // 360/0.9=400. 360/1.8=200.
#define STEPS_PER_TURN (NORMAL_MOTOR_STEPS * MICROSTEPS) // default number of steps per turn * microsteps
#define PULLEY_PITCH (2*16.0) // 2mm per tooth, 20 teeth.
#define THREAD_PER_STEP (PULLEY_PITCH/STEPS_PER_TURN)
#define MICROSTEP_PER_DEGREE (STEPS_PER_TURN/360.0)Thanks for any suggestions
Rob.
That is odd. I normally get better quality higher up. If you draw a 10cm line in any one direction is it actually 10cm?
fwiw, I have been doing experiments with adjusting acceleration based on machine size and plotter position.
Acceleration sideways can be higher when the plotter is near the top of the drawing because the V shape of the belts is much wider (more stable).
I would have used 547.
As the plotter moves around the belt changes position on the pulley. this is *really annoying* if you want precision. On the M5 the belt is usually touching on the bottom inside screw of the motor, which keeps it mostly under control. I say usually because in the very bottom corners of the drawing area the belt can lean away from the screw. If it were always at exactly that spot the image quality would be even better.
I have a feeling you are going to invent new and interesting ways of making even more accurate pictures, and I welcome your efforts.
That is pretty good! Without a way to further stabilize the pen (reduce wobble) that’s about as good as it gets.
One suggested way to reduce wobble would be more contact points on the wall (2 points + pen tip).
Another is to double the belts so they hold both ends of the pen.
Both would require experimentation.
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