Please Help me interpret accelerometer
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Hi!
I’m building a printer, CoreXY toolchanger, 500x500x600 build area.
When Irun the accelerometer on the carriage I get very hight response at very low frequency. Around 0.7 and 2Hz regardless of M201 setting, regardless of whether I tighten or loosen my belts.Now using 3.4b6 but same problem since I got the accelerometer when this was first introduced.
My speed settings for XY:
M556 50
M203 33900 (reaching 500mm/s when collecting accelerometer data)
M201 5000
M204 5000Collecting after 4s wait with:
M955 P0 C"0.spi.cs2+0.spi.cs3" I41
M956 P0 S1000 A0 G4 P10 G1 X100 F30000!
I’ve been having this issue since the beginning and I now thaught that I’d ask for help.
This are some imaages of the printer if it helps:
Also, my config files are at: https://github.com/TypQxQ/DuetBackup/tree/main/qTC-backup
Thank you for looking at this.
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@typqxq i don't see a M955 to configure the accelerometer. specifically you need to set the orientation based on the axis of your machine.
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@t3p3tony Forgot about it, have it in a macro:
M955 P0 C"0.spi.cs2+0.spi.cs3" I41 -
@typqxq ahh ok. Looking at your accelerometer mounting I think I41 is correct.
Can you try using the Input shaping plugin rather than the accelerometer plugin, This uses the accelerometer to measure vibration after a deceleration.
https://forum.duet3d.com/topic/25999/inputshaping-plugin-0-2-0-pre8-released
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@t3p3tony Thank you! This looks much better!
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@typqxq said in Please Help me interpret accelerometer:
@t3p3tony Thank you! This looks much better!
Hello together,
I was reading several times about using an accelometer to measure resonances..... For sure it's a stupid question but is that device helpful to adjust the Jerk as well the max. acceleration somehow.... And if yes, how!?!? I'm wondering if that will help me to adjust my printer a bit propped/smoother than it is right now..... And where I can find some information about that topic.
Sorry for asking that stupid questions but I can't find any helpful information for me as a rooky regarding Duet and RepRap FW.
Many thanks
Danijel
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SIMPLY WHEN ANALYZING THE GRAPH IN THE FREQUENCY (EX: AXIS x )RANGE WITHIN 100 HZ YOU TAKE THEHIGHER PEAK FREQUENCY, THEN IN CONFIG ENTER THE CODE TO COMPENSATE FOR THAT FREQUENCY
EX:M593 P"zvd" F70
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@massimilianoconti said in Please Help me interpret accelerometer:
SIMPLY WHEN ANALYZING THE GRAPH IN THE FREQUENCY (EX: AXIS x )RANGE WITHIN 100 HZ YOU TAKE THEHIGHER PEAK FREQUENCY, THEN IN CONFIG ENTER THE CODE TO COMPENSATE FOR THAT FREQUENCY
EX:M593 P"zvd" F70
INDOOR VOICE!
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however I would check the mechanics from the belts to the bearings and the frame, from the graph you can see many peaks of great value, which suggests a significant mechanical instability ... I'll show you my graph by X axis
