![]() ![]() Configurable post-processors default to metric (G21).Post-processors produce either metric (G21) output, Imperial (G20) output or are configurable.Machine output unit is completely unrelated to your selected unit schema.Generating the correct unit in output is the responsibility of the post-processor and is done only at that time.Changing your preferred unit schema will have no effect on output but will help avoid input errors.If you design in US units, either the Imperial Decimal and Building US will work If you're a Path user and prefer to design in metric, it's highly recommended that you use the "Metric Small Parts & CNC" schema. Changing schema in preferences changes default unit string for the input fields.Most post-processors will automatically convert the unit when generating gcode. Most CNC machines expect feed rate in the form of either 'mm/min' or 'in/min'.If you're using the default schema and you enter a feed rate without a unit string, it will get entered as 'mm/s' The default unit schema uses the default units.This is what FreeCAD stores internally regardless of anything else FreeCAD base units for length and time are 'mm' and 's' respectively. ![]() Look for possible collisions with clamps or other obstacles along the paths. If necessary, model your clamping mechanisms in FreeCAD in order to better inspect the paths generated. ![]() Consequently, please review and simulate the paths you generate prior to sending the code to your machine.
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