April 19, 2020 at 4:37 pm #28325
This may just be a bad servo, but I’m having a problem getting my pen off the page.
It comes up for some stuff, but not for others, so the servo isn’t dead, but it’s behaving badly. I don’t know if that’s the servo’s fault or not.
I am using the command line interface from a raspberry pi 3b.
Axicli filename.svg -L2 -d40 -u55 -Z 200 -C
So, constant speed with 200ms delay on pen up, with what I hoped would be limited travel on the servo arm.
The servo arm swings almost 180 degrees, which is where the pen lift failure is happening.
I had hoped the -d40 -u55 would constrain its motion, but it doesn’t seem to.
Also the servo arm bounces back and forth in the downward position, in what I imagine is the difference between the -d40 and -u55, but in the wrong orientation with respect to “up.”
Is this just a bad servo? If so, no big deal. If not, where should I look?
ThanksApril 19, 2020 at 5:03 pm #28326Windell OskayKeymaster
Is this one of our servos that came with the arm pre-attached, or is this some other servo?April 20, 2020 at 9:31 am #28327
It’s a replacement servo that came from you, and that I installed, but has been working fine.
If this should matter, I have more than one raspberry pi, and this axidraw is now attached to a different raspberry pi than it was previously.
I have not created any config files on the rpi
April 20, 2020 at 1:05 pm #28329Windell OskayKeymaster
- This reply was modified 9 months ago by vincentP.
My initial guess is that this could have been a “mis calibrated” servo, with the arm at the wrong angle, but since it’s one of ours, I would now suspect that it is just a bad servo. If so, please contact customer service via email for a replacement.
One other thing to check, if you are able to, would be to try raising and lowering the pen between those same values from within Inkscape (ideally on a desktop computer). If it still fails in the same way, you can be sure that it’s a matter of hardware failure rather than of something in the software setup or parameters in the CLI.April 20, 2020 at 2:34 pm #28330
Well, it had been working, so I figured it might be the servo, and your above test confirms it.
I connected to a MAC book pro with Axidraw extensions in Inkscape, and when I tried to toggle the servo once, it goes up and down repeatedly non-stop until I powered off the Axidraw.
I’ll send for a new servo.
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