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Adjust arc radius precision check for INCHES #1106

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10 changes: 9 additions & 1 deletion grbl/gcode.c
Original file line number Diff line number Diff line change
Expand Up @@ -800,7 +800,15 @@ uint8_t gc_execute_line(char *line)

// Compute difference between current location and target radii for final error-checks.
float delta_r = fabs(target_r-gc_block.values.r);
if (delta_r > 0.005) {

float max_delta_r = 0.005;
if (gc_block.modal.units == UNITS_MODE_INCHES) {
// We need to adjust this when using inches,
// otherwise we get false negatives STATUS_GCODE_INVALID_TARGET errors.
max_delta_r *= MM_PER_INCH;
}

if (delta_r > max_delta_r) {
if (delta_r > 0.5) { FAIL(STATUS_GCODE_INVALID_TARGET); } // [Arc definition error] > 0.5mm
if (delta_r > (0.001*gc_block.values.r)) { FAIL(STATUS_GCODE_INVALID_TARGET); } // [Arc definition error] > 0.005mm AND 0.1% radius
}
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