Marcin at 13:20, 12 June 2013

2013-06-12T13:20:37Z

← Older revision		Revision as of 13:20, 12 June 2013
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	They can definitely manage a 2.5A stepper with microstepping. Since their BOM cost is in the single-digit dollars, I definitely recommend you try them first. Their current control is at 0.25V/A, so you want to set them to 2.5Asqrt(2)/20.25V/A = 0.44V. Remember, for a 2.5A stepper with microstepping, you only need sqrt(2)/2 of its max current in each coil, so 1.77A for a 2.5A stepper. The ones from Pololu are closed source and have slightly worse thermal design, but they should be able to keep up with your steppers too.		They can definitely manage a 2.5A stepper with microstepping. Since their BOM cost is in the single-digit dollars, I definitely recommend you try them first. Their current control is at 0.25V/A, so you want to set them to 2.5Asqrt(2)/20.25V/A = 0.44V. Remember, for a 2.5A stepper with microstepping, you only need sqrt(2)/2 of its max current in each coil, so 1.77A for a 2.5A stepper. The ones from Pololu are closed source and have slightly worse thermal design, but they should be able to keep up with your steppers too.

			=Parts Sourcing=
			*Cool DRV stepper motor driver - 2.0A - [http://www.reprapdiscount.com/electronics/36-drv-8825-designed-by-kliment-pololu-compatible-driver.html]
			*RAMPS - from [[Lulzbot]]

Marcin: Created page with "=From Kliment= It would appear powerlolu is a license violation, as it's NC-licensed but a derivative of my GPL design. I still think if you are only using 2.5A steppers on ..."

2013-06-12T13:19:37Z

Created page with "=From Kliment= It would appear powerlolu is a license violation, as it's NC-licensed but a derivative of my GPL design. I still think if you are only using 2.5A steppers on ..."

New page

=From Kliment=

It would appear powerlolu is a license violation, as it's NC-licensed but a derivative of my GPL design.

I still think if you are only using 2.5A steppers on RAMPS then you should rather go with a drv8825-based design. That would be a drop-in for RAMPS. The ones I designed are available at https://github.com/kliment/cooldrv, GPLv3 licensed, and can be purchased at

http://www.reprapdiscount.com/electronics/36-drv-8825-designed-by-kliment-pololu-compatible-driver.html

They can definitely manage a 2.5A stepper with microstepping. Since their BOM cost is in the single-digit dollars, I definitely recommend you try them first. Their current control is at 0.25V/A, so you want to set them to 2.5A*sqrt(2)/2*0.25V/A = 0.44V. Remember, for a 2.5A stepper with microstepping, you only need sqrt(2)/2 of its max current in each coil, so 1.77A for a 2.5A stepper. The ones from Pololu are closed source and have slightly worse thermal design, but they should be able to keep up with your steppers too.

CNC Torch Table Electronics - Revision history

Marcin at 13:20, 12 June 2013

Marcin: Created page with "=From Kliment= It would appear powerlolu is a license violation, as it's NC-licensed but a derivative of my GPL design. I still think if you are only using 2.5A steppers on ..."