1 Topic by w_smith

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Topic: Vref, how close to 1.5V should it be?

So my SD4 is getting ready for the First great Rebuild (Lawsy carriages, E3D hotend, etc) and I've seen some mention of Vref lately, so I thought I'd check.

So my board looks like:

http://geekho.com/push/SD4Board.jpg

(Well, without the camera shake), and the Vref readings from left to right (X,Y,Z,E) are:

1.634
1.631
1.665
1.553

Are those close enough to the correct(?) values of 1.5 that I should leave them?  Are they high because Solidoodle carefully (ha!) tweaked them for proper operation with this particular printer?  Should I leave them alone or set them to 1.5?

And what board is this called, so I know how to reference it when I ask about firmware updates for the E3D hotend?

Thanks!

2 Reply by wardjr

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Re: Vref, how close to 1.5V should it be?

That is a Printerboard and if your motors work fine don't touch the VREF's.  You will end up adjusting the extruder VREF once you install the e3d.  Those voltages are just a reference/starting point.  Proper adjustment will require some fine tuning by ear.

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3 Reply by grob (edited by grob 2015-03-30 23:36:32)

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Re: Vref, how close to 1.5V should it be?

To answer the (?) next to "correct", here's solidoodle support's instructions:
http://support.solidoodle.com/hc/en-us/ … Solidoodle
They reckon the voltages should be X=1V, Y=1V, Z=1V and E=0.25V. Are you measuring the right pin on the trimpot (as suggested in the instructions above)?

I second wardjr, don't adjust if it's working!

That said, I highly recommend adjusting by ear if you have the time/compulsion. Printrbot has a calibration guide that might be a little on the simple side but gives a good idea: http://help.printrbot.com/Guide/Adjust+ … h+D%29/115

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4 Reply by w_smith

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Re: Vref, how close to 1.5V should it be?

grob wrote:

To answer the (?) next to "correct", here's solidoodle support's instructions:
http://support.solidoodle.com/hc/en-us/ … Solidoodle
They reckon the voltages should be X=1V, Y=1V, Z=1V and E=0.25V. Are you measuring the right pin on the trimpot (as suggested in the instructions above)?

I second wardjr, don't adjust if it's working!

That said, I highly recommend adjusting by ear if you have the time/compulsion. Printrbot has a calibration guide that might be a little on the simple side but gives a good idea: http://help.printrbot.com/Guide/Adjust+ … h+D%29/115

Ah, I was measuring across the pot, I'll remeasure when I have the cover off again.

Thanks!