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Using IMUs on moving carriages

Posted by misan 
Using IMUs on moving carriages
December 13, 2013 06:47AM
One of the bad things about most of our bot's design is the open-loop nature using stepper motors (without an encoder).

It ocurred to me that an accelerometer on moving carriages could provide a feedback loop that might be used to detect and correct skipped steps (if I am watching my printer and the head bumps into something missing steps I can fix that by pausing and homing the head before resuming). Three-axis accelerometers can be had quite cheaply these days.

But before venturing into more work I mention it here just in case some of you guys already did some tests and discarded it for some reason.

Maybe just the answer is to use optical encoders instead ...
Re: Using IMUs on moving carriages
December 13, 2013 10:48AM
Well, I discarded the idea before because it would be near impossible to know exactly how many missed steps. However, an xy home and a resume is genius. Add this and a filament feed sensor and you will protect against 90% of all fails
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