I'll save you a lot of headache and just say use 3Nm motors run at 65-70Vdc on 75-80vdc drives and you won't have any problems cutting anything.
Cutting speeds will depend on many factors like spindle power and tool material but 4500-5000mm/min wouldn't be out the way with 2.2Kw spindle using carbide tooling.
I apologize for not reading everything, Jazzcnc's post would have answered my question.
I'm looking into your advice about getting away from direct drive. It would be much easier to optimize stepper motor performance with the ability to change the drive ratio. I'm not sure why this side of the pond prefers direct drive and drives on the wrong side of the road.
One of the reasons I joined this group was to look into different ways to do things.
Thanks to all for your help
I am going to use PoStep60-256 drivers and 48V PSU.
http://www.poscope.com/nema23 are the same motors that zappautomation or cnc4pc sells. That are the motors that most people drive at 70V with Leadshine drives.
I also am looking at that drive you say, plus they have new 8axis ethernet board. Just today wrote them a big letter asking them many things about the board and the drives.
What i am saying is that when looking at the pdf of the motors StepperMotorDimensionsNema23.pdf the torque curve driven at 60V or 40V is very same till 3000rpm, hence 4 motors can be driven by 2x35VAC toroid 500w, which rectified will give ~49VDC, which is very near the drive capability /50VDC 6A/ . One of the questions i asked is if really this drive could drive the motor with this setup, i expect they will answer me tomorrow.
What i say is that will be better than the motor you say.
I agree for the IDC, but on the other hand i like that option , if their drives are good i mean, cause i could connect drives and BOB with cables. This drives should be DSP, yes? Its not mentioned at any place.
Honestly i realy have great hopes for that combo, cause i prefer EU made stuff than Leadshine for example in my machines. Especially given the size of the drives.
I was almost ready to buy a 4 motor drive and bob today. how good that you have it already.
My biggest questions are:
-any major drawbacks like definite inability to do something in mach3?
-4rth axis, gantry squaring and so on...
I will wait then to see what you say. I hope at the end somebody managed to make decent cheap Ethernet board with more than 4 axis.
How can i calculate what motor size i need for my gantry if i use rack and gear on both sides. This example is for ballscrews. Looking forward for your answer.
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