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Prusa i3 Hephestos - Driver calibration necessary?

Posted by Webpicasso 
Prusa i3 Hephestos - Driver calibration necessary?
October 20, 2015 08:43AM
Hi there,

I'm in the last steps of assembling my bq Prusa i3 Hephestos. I found in the annex the topic "driver calibration" and I'm not sure if it's necessary to perform? Or is it already calibrated from bq?

Thanks smiling smiley
Christian
Solved: Prusa i3 Hephestos - Driver calibration necessary?
October 21, 2015 08:40AM
Whom it may concern!

I got the answer from the bq support: spinning smiley sticking its tongue out

They are already calibrated, so it is not necessary. :-)

Calibration is indicated only if you notice abnormal behaviours in the movement of the motors along the three axes. This may happen after a long time using the printer or, in some rare cases, right after assembling it. If the drivers needed calibration you would definitely notice it when you start using it as the prints would not be accurate at all (motors could skip steps, etc.)
.

Cheers
Christian
Re: Prusa i3 Hephestos - Driver calibration necessary?
October 22, 2015 10:25AM
Hi Christian,

Even if they're pre calibrated from the factory,
just check the values are good :
MotorCurrent(A)*8*Rs=Vref
Rs depends of your drivers resistance (0.05 to 0.2)

++JM

Edited 1 time(s). Last edit at 10/22/2015 10:26AM by J-Max.
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