Please check if the following statements are 100% correct and accurate. If not, pl point out:
I read somewhere that the "basic length unit" (BLU) is the distance by which the slide moves with one electrical pulse to stepper/servo motor. It would depend on step angle, gear ratio, pitch of the lead screw etc.
How much is this distance, typically?
We can call it control resolution because this is the theoretical minimum distance which the control can differentiate. (Since the control uses a large number of bits, typically 32, to store the slide position, the bit storage capacity does not put a limitation on control resolution).
How is BLU (i.e., control resolution) related to least input increment (min possible is 0.0001 mm in IS-C)?
The operator's manual uses a term "least command increment" apart from "least input increment." What exactly is "least command increment"?
From operator's manual:
"The least input increment is the least increment for programming the travel distance. The least command increment is the least increment for moving the tool on the machine.
...
The least command increment is either metric or inch depending on the machine tool".
From parameter manual:
Parameter 1001#0 (INM) Least command increment on the linear axis
= 0 : in mm (metric system machine)
= 1 : in inch (inch system machine)
What exactly is metric/inch system machine?
Is least command increment same as what I am referring to as BLU?
How is least input increment related to least command increment when we use G21 on an inch system machine, or G20 on a metric system machine?