The point of 300,000 steps per second is in the difference between
the fastest speed you want your motors turning at and the second fastest
speed you want your motors turning at. If you want to be able to run at
10,000 steps per second, you can't use a a system that has a maximum
step rate of 10,000 steps per second.
_________________________--------------------------------------_______________________
50uS 50uS
Here is a plot of a system that maxes out at 10,000 steps per second.
50Us for the high and 50uS for the low makes for one clock pulse. The
next slower speed would be 6,666 steps per second.
__________________________________________________--------------------------------------________________________________________________
50uS 50uS 50uS 50uS
50uS
Trying to change the speed of a stepper motor from 7,000 steps per
second to 10,000 steps per second in one jump would not succeed. That's
why you want the fastest top speed you can get, because it's nicer to
jump from 9,980 steps per second to 10,000 steps per second. I don't
mean to say that this is the STM32F104's granularity with klipper3d's
software, I don't know what the granularity is.
Here is the benefit of this use of the STM32F104.
1. Use LinuxCNC on a hand-me-down X86 computer that would have otherwise
been thrown away.
2. Not be speed limited by the latency test results (unless they were
terrible).
3. Not have to buy an Orange Pi which I don't have.
4. Make it possible to control a desktop machine with a hand-me-down PC
and a $14 GRBL setup.
(http://www.zyltech.com/arduino-cnc-kit-uno-r3-shield-4x-a4988-drivers/)
The drawback of STMBL (not much of a drawback) is I would need to buy a
MESA card for the real time issues.
If I remember properly, the granularity for a MESA card is 10nS per pin
change. No one would try running their stepper motor at 50,000,000
steps per second, but it makes going from 10,000 steps per second to the
next higher rate a piece of cake for the motor.
On 8/15/20 12:57 AM, Chris Albertson wrote:
What is the point of 300,000 steps per second if the
motos cn't move that fast.
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