Instrument maker

[Boyan Silyavski]

Boyan why do you think you can't run at 16000 mm/min with steppers?

Because i have never seen it achieve serious speeds except on RP builds

As far as i know to reach let's say 16 000 mm min on a xx10 ball screw you will need to spin that motor at 1600rpm. At 200 steps per rev then resolution will be mere 0.5mm . So microstepping then and loss of the incremental torque. The acceleration also counts when fast machine is desired, and many changes of direction have to be made when routing large 3d file.

At the other side for the machine to be able to work at that feedrate the gantry and Z should be very strong / ok, just strong-not talking OTT here/ which means weight

The spindle to achieve serious feed rates and deep cuts or fast shallow cuts with big cutters needs to be powerful. In fact the way i see it my 3kw spindle is limiting me now, not the speed that the machine could achieve. Though more or less i am finding now that my machine is well balanced. Anyway, i wanted to say that the 3kw spindle needs serious Z axis. Otherwise the bit will be prematurely dull because of vibrations.


So i don't see 100kg gantry on small machine moven by steppers at that speed. Not to speak of 200kg gantry on 8x6 machine. From what i have read in forums and builds i have looked and studied, people using steppers normally achieve 5000-mm min on a normal build and 10 000mm / min on the better thought builds. I doubt that this 10 000mm /min is really usable with good acceleration on actual cutting, not rapids.


I am not sure about current prices but 4x30 +4x80 =440 euro for 4 Leadshine drives plus motors. When at the same time i said it many times here for a bit more/ ~200/ you could get the cheapest servo motors plus drives. Which i believe is to be more reasonable considering a good build.

And now after testing the cheap chinese controller for a couple of weeks- Let's cut this money from the expensive controllers.