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Hi, I am Michael from GErmany and i am going to build my own Engraver Cutter.
But i have a couple Questions about The Motors and the Drivers.
I was looking for these Stepper Motors and for these Controllers.
What do you think? Overpowered or to small
Please let ne know.
Thank you.
ST4209L1704 from Nanotec http://en.nanotec.com/steppermotor_st4209.html
and the Digital Driver
Leadshine DM556 from Leadshine http://www.leadshine.com/Show_Product.asp?id=200&Class_Name=DM556&B_id=0
and of course the Power Supply
Sorontec 48Volt - 320Watt - 6.7amp http://www.sorotec.de/shop/product_info.php/language/en/info/p706_schaltnetzteil-48v-320watt-6-7a.html

Nice ? or not useable

Greetings

I think the motors and drivers are fine. The inductance of the motors is higher than some, but I think you will be fine. My NEMA17 motors start to get hot at 24V and 1.6Amp. At 48V you will have to lower the current a lot and possible get near the 0.50 amp min on the driver. I think you are better to use 24V power supply. You might want to add some devices in the future that run off 24V or that have a linear regulator that would be 36V max. I sometimes buy 28V power supplies that can be adjusted up to at least 30 and down close to 24V.

Your motors are fine, but the drivers are opto-isolated which means that they may or may not work with the retina controller.

You don't really need a full 48V on such a small machine. It will work but you may end up needing a second power supply for 12 or 5 volts. If you use a 24V power supply you can use linear regulators no problem which is easy.