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[on:]

Can some tell me the maximum pulse rate (how many hertz) I can get from the arduino Uno. I am planning to use the gecko drive and one nema 34 stepper but I am afraid the ardruino is not fast enough.

Luis

[Reply #1 on:]

nema 34 stepper but I am afraid the ardruino is not fast enough

Steppers are very very slow 1-10ms.
The Arduino 1000s of times faster. 

[Reply #2 on:]

grbl is able to sustain about 30,000 pulses / sec to multiple motors simultaneously. So...at least 30KHz....

[Reply #3 on:]

nema 34 stepper but I am afraid the ardruino is not fast enough

Steppers are very very slow 1-10ms.
The Arduino 1000s of times faster. 

No, _some_ stepper motors are slow.

That driver is a microstepping driver designed to power bipolar steppers from a supply of
upto 80V, so upto 100kHz step rate isn't beyond the bounds of possibility.

A high performance bipolar motor can go to 1000rpm or more with the right driver, which is already over 3kHz for
full-steps (30kHz for tenth-steps which is the GeckoDrive default I believe).

[Reply #4 on:]

If you are using Arduino C it will be much slower than if you use AVR Assembler, but Assembler will leave all the effort of protecting registers and data to you.  Program sizes can also be much smaller with assembler - I have played with a steeper driver using first an UNO and later an ATtiny2313. Program size from Arduino was 1200 bytes. Program size for the same function in Assembly was 88 bytes.

[Reply #5 on:]

On my CNC, the frequency is at least 25kh (mach3 and gecko's) .... but I am running them at 45kh at the moment .... It also depend on what you want to do. Generally if you cut wood,alluminium, acrylic etc. the speed of the system is a relative problem, generally you cut at lower speed than the limits of the machine, you reach the maximum speed only on "rapid" movement (when you go A to B without cutting).
So if Arduino can drive three or four Gecko at 25kh I see no problem to drive even a big CNC. But I don't really know if Arduino can ...