That makes perfect sense.... if never anything goes wrong
what if one motor stalls, what if one signal needs to be re-transmitted?
If neither of that is corrected... one axis is off "time shifted"
relative to the other.
For precision sake, you would need feedback from one axis to the other.
On 1/24/20 10:14 PM, Erik Christiansen wrote:
On 24.01.20 20:27, Alan Condit wrote:
Chris,
If I send 10000 steps to a smart X-axis controller, how does it stay in sync
with a smart
y-axis controller without someone controlling the synchronization between the
two?
One way could be for the host to pulse the x and y step pins in
synchronism at a suitable multiple of the steps needed for the longer
run. If we need a slope of 0.16666666667, then tell one smart controller
to divide by 1, the other by 6.
Even pi can be approximated to 1 part in ten million by 355/113, so a
bit of smarts in the host could keep the axis controllers simple yet
flexible, I figure.
Motion commands could be sent on RS485 serial, before the primary step
sequence begins.
Erik
(Who hasn't read the whole thread, unfortunately. There's a 1 foot
diameter branch down in the front garden, and it needs to go before its
ute-load of eucalyptus leaves dries to a pyromaniac's dream.)
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