Marlin Motion Related Configuration.h Settings for MakerFarm i3v

[printbus]

ACHIEVABLE STEP RATES AND MOTOR ROTATION RATES

We can at least continue to expand the knowledge base related to the settings and see where it takes us...

http://reprap.org/wiki/Step_rates suggests the maximum "achievable" step rate for an ATMEGA processor and RAMPS is 16,000 steps per second. No insight into how this was determined is provided. For RAMPS and its typical stepper driver boards based on the A4988 chip, a selection of full-step, 1/2-step, 1/4-step, 1/8-step, and 1/16-step microstepping can be made through three jumpers on the RAMPS board under each stepper driver board. The MakerFarm configuration, if not a fairly universal configuration, is to install all three jumpers to select the 1/16 microstepping mode.

Standard reprap step motors move in 1.8 degree increments per full step, or 200 full steps per revolution of the shaft. At 1/16 microstepping, this is 200 * 16 or 3,200 microsteps per revolution. So, the step rate wiki suggests an achievable motor shaft rotation rate of 16,000 steps per second / 3,200 steps per revolution, or 5 revs per second.

Coming up: an explanation of the numbers in DEFAULT_STEPS_PER_UNIT, and using the achievable step rate and DEFAULT_STEPS_PER_UNIT values to imply theoretically "achievable" feed rate settings.