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From: Owen M Collins <ccstudio.o...@gmail.com>
Date: Mon, 15 Oct 2012 23:34:33 -0400
Local: Mon, Oct 15 2012 11:34 pm
Subject: Re: Shifting in x axis
For idler, are you talking in the extruder or the pulleys in the XY? I am running a MG that is doing great. I want to get this thing tuned enough o finish printing the XY lowrider replacement. Then I hope it will be easier to move the XY since it will be on bearings, instead of plastic bushings. I will check the current setting on the driver.
Thank you for the detailed response.
O.
On Oct 15, 2012, at 11:13 PM, whosawhatsis wrote:
> Could be too-high current (overheating), too-low current (truncated torque curve), increased idler friction (it's worth "down-grading" to the old style bearing idler). Might also just be too much mass for the motor's torque at that voltage.
> The motors included with the cupcake have a TERRIBLE torque curve when run at 12V. They're rated for 14V, and a current-limiting driver like the Pololu should have about 2.5X the motor's rated torque). I HIGHLY recommend replacing at least the X motor (the stationary one that doesn't need to be small and light, but DOES need the spare torque to whip the entire Y axis back and forth) with a larger, higher-torque, lower-impedance stepper. I replaced both motors on my cupcake with different 400-step models, and it performs amazingly.
> Here are the motors I'm using:
> Note, these are 400-step motors, while most are only 200-step. You'll get better detail (I originally tried them because I got my quality so high that the X/Y resolution was the limiting factor) and lower noise, but you'll have to modify your machine profile to make them work.
> On Monday, October 15, 2012 at 7:51 PM, Owen M Collins wrote:
>> I have a persistent (as in happens in different prints at different points) shift in my x axis. I am using polulus for my xyz. I guess it could be overheating and losing steps. I have attached a picture, the ends should have a circular hole on them. But the shifting has messed that up.
>> I will check the temp of the driver while printing, any other thoughts on what it could be?
>> (Cupcake with stepper extruder)
>> Thanks
>> Sent from my mobile
>> Attachments:
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