3d_print_resources/Marlin
1
0
Fork 0
Code Issues Pull requests Releases Wiki Activity

Scale feedrate (mm/s to deg/s) for SCARA

Browse source
This commit is contained in:
Scott Lahteine 2018-04-03 20:59:29 -05:00
parent bc2fc86993
commit c46d47f45f
5 changed files with 145 additions and 33 deletions
Download patch file Download diff file Expand all files Collapse all files

123
Marlin/Marlin_main.cpp
View file

@ -12848,6 +12848,20 @@ void set_current_from_steppers_for_axis(const AxisEnum axis) {
#if !UBL_SEGMENTED
#if IS_KINEMATIC
#if IS_SCARA
/**
* Before raising this value, use M665 S[seg_per_sec] to decrease
* the number of segments-per-second. Default is 200. Some deltas
* do better with 160 or lower. It would be good to know how many
* segments-per-second are actually possible for SCARA on AVR.
*
* Longer segments result in less kinematic overhead
* but may produce jagged lines. Try 0.5mm, 1.0mm, and 2.0mm
* and compare the difference.
*/
#define SCARA_MIN_SEGMENT_LENGTH 0.5
#endif
/**
* Prepare a linear move in a DELTA or SCARA setup.
*
@ -12892,9 +12906,9 @@ void set_current_from_steppers_for_axis(const AxisEnum axis) {
// gives the number of segments
uint16_t segments = delta_segments_per_second * seconds;
// For SCARA minimum segment size is 0.25mm
// For SCARA enforce a minimum segment size
#if IS_SCARA
NOMORE(segments, cartesian_mm * 4);
NOMORE(segments, cartesian_mm * (1.0 / SCARA_MIN_SEGMENT_LENGTH));
#endif
// At least one segment is required
@ -12902,7 +12916,6 @@ void set_current_from_steppers_for_axis(const AxisEnum axis) {
// The approximate length of each segment
const float inv_segments = 1.0 / float(segments),
cartesian_segment_mm = cartesian_mm * inv_segments,
segment_distance[XYZE] = {
xdiff * inv_segments,
ydiff * inv_segments,
@ -12910,16 +12923,47 @@ void set_current_from_steppers_for_axis(const AxisEnum axis) {
ediff * inv_segments
};
// SERIAL_ECHOPAIR("mm=", cartesian_mm);
// SERIAL_ECHOPAIR(" seconds=", seconds);
// SERIAL_ECHOLNPAIR(" segments=", segments);
// SERIAL_ECHOLNPAIR(" segment_mm=", cartesian_segment_mm);
#if DISABLED(SCARA_FEEDRATE_SCALING)
const float cartesian_segment_mm = cartesian_mm * inv_segments;
#endif
/*
SERIAL_ECHOPAIR("mm=", cartesian_mm);
SERIAL_ECHOPAIR(" seconds=", seconds);
SERIAL_ECHOPAIR(" segments=", segments);
#if DISABLED(SCARA_FEEDRATE_SCALING)
SERIAL_ECHOLNPAIR(" segment_mm=", cartesian_segment_mm);
#else
SERIAL_EOL();
#endif
//*/
#if ENABLED(SCARA_FEEDRATE_SCALING)
// SCARA needs to scale the feed rate from mm/s to degrees/s
// i.e., Complete the angular vector in the given time.
const float segment_length = cartesian_mm * inv_segments,
inv_segment_length = 1.0 / segment_length, // 1/mm/segs
inverse_secs = inv_segment_length * _feedrate_mm_s;
float oldA = planner.position_float[A_AXIS],
oldB = planner.position_float[B_AXIS];
/*
SERIAL_ECHOPGM("Scaled kinematic move: ");
SERIAL_ECHOPAIR(" segment_length (inv)=", segment_length);
SERIAL_ECHOPAIR(" (", inv_segment_length);
SERIAL_ECHOPAIR(") _feedrate_mm_s=", _feedrate_mm_s);
SERIAL_ECHOPAIR(" inverse_secs=", inverse_secs);
SERIAL_ECHOPAIR(" oldA=", oldA);
SERIAL_ECHOLNPAIR(" oldB=", oldB);
safe_delay(5);
//*/
#endif
// Get the current position as starting point
float raw[XYZE];
COPY(raw, current_position);
// Calculate and execute the segments
while (--segments) {
@ -12939,11 +12983,41 @@ void set_current_from_steppers_for_axis(const AxisEnum axis) {
ADJUST_DELTA(raw); // Adjust Z if bed leveling is enabled
planner.buffer_line(delta[A_AXIS], delta[B_AXIS], delta[C_AXIS], raw[E_AXIS], _feedrate_mm_s, active_extruder, cartesian_segment_mm);
#if ENABLED(SCARA_FEEDRATE_SCALING)
// For SCARA scale the feed rate from mm/s to degrees/s
// i.e., Complete the angular vector in the given time.
planner.buffer_segment(delta[A_AXIS], delta[B_AXIS], raw[Z_AXIS], raw[E_AXIS], HYPOT(delta[A_AXIS] - oldA, delta[B_AXIS] - oldB) * inverse_secs, active_extruder);
/*
SERIAL_ECHO(segments);
SERIAL_ECHOPAIR(": X=", raw[X_AXIS]); SERIAL_ECHOPAIR(" Y=", raw[Y_AXIS]);
SERIAL_ECHOPAIR(" A=", delta[A_AXIS]); SERIAL_ECHOPAIR(" B=", delta[B_AXIS]);
SERIAL_ECHOLNPAIR(" F", HYPOT(delta[A_AXIS] - oldA, delta[B_AXIS] - oldB) * inverse_secs * 60);
safe_delay(5);
//*/
oldA = delta[A_AXIS]; oldB = delta[B_AXIS];
#else
planner.buffer_line(delta[A_AXIS], delta[B_AXIS], delta[C_AXIS], raw[E_AXIS], _feedrate_mm_s, active_extruder, cartesian_segment_mm);
#endif
}
// Ensure last segment arrives at target location.
planner.buffer_line_kinematic(rtarget, _feedrate_mm_s, active_extruder, cartesian_segment_mm);
#if ENABLED(SCARA_FEEDRATE_SCALING)
inverse_kinematics(rtarget);
ADJUST_DELTA(rtarget);
const float diff2 = HYPOT2(delta[A_AXIS] - oldA, delta[B_AXIS] - oldB);
if (diff2) {
planner.buffer_segment(delta[A_AXIS], delta[B_AXIS], rtarget[Z_AXIS], rtarget[E_AXIS], SQRT(diff2) * inverse_secs, active_extruder);
/*
SERIAL_ECHOPAIR("final: A=", delta[A_AXIS]); SERIAL_ECHOPAIR(" B=", delta[B_AXIS]);
SERIAL_ECHOPAIR(" adiff=", delta[A_AXIS] - oldA); SERIAL_ECHOPAIR(" bdiff=", delta[B_AXIS] - oldB);
SERIAL_ECHOLNPAIR(" F", (SQRT(diff2) * inverse_secs) * 60);
SERIAL_EOL();
safe_delay(5);
//*/
}
#else
planner.buffer_line_kinematic(rtarget, _feedrate_mm_s, active_extruder, cartesian_segment_mm);
#endif
return false; // caller will update current_position
}
@ -13227,6 +13301,14 @@ void prepare_move_to_destination() {
millis_t next_idle_ms = millis() + 200UL;
#if ENABLED(SCARA_FEEDRATE_SCALING)
// SCARA needs to scale the feed rate from mm/s to degrees/s
const float inv_segment_length = 1.0 / (MM_PER_ARC_SEGMENT),
inverse_secs = inv_segment_length * fr_mm_s;
float oldA = planner.position_float[A_AXIS],
oldB = planner.position_float[B_AXIS];
#endif
#if N_ARC_CORRECTION > 1
int8_t arc_recalc_count = N_ARC_CORRECTION;
#endif
@ -13270,11 +13352,28 @@ void prepare_move_to_destination() {
clamp_to_software_endstops(raw);
planner.buffer_line_kinematic(raw, fr_mm_s, active_extruder);
#if ENABLED(SCARA_FEEDRATE_SCALING)
// For SCARA scale the feed rate from mm/s to degrees/s
// i.e., Complete the angular vector in the given time.
inverse_kinematics(raw);
ADJUST_DELTA(raw);
planner.buffer_segment(delta[A_AXIS], delta[B_AXIS], raw[Z_AXIS], raw[E_AXIS], HYPOT(delta[A_AXIS] - oldA, delta[B_AXIS] - oldB) * inverse_secs, active_extruder);
oldA = delta[A_AXIS]; oldB = delta[B_AXIS];
#else
planner.buffer_line_kinematic(raw, fr_mm_s, active_extruder);
#endif
}
// Ensure last segment arrives at target location.
planner.buffer_line_kinematic(cart, fr_mm_s, active_extruder);
#if ENABLED(SCARA_FEEDRATE_SCALING)
inverse_kinematics(cart);
ADJUST_DELTA(cart);
const float diff2 = HYPOT2(delta[A_AXIS] - oldA, delta[B_AXIS] - oldB);
if (diff2)
planner.buffer_segment(delta[A_AXIS], delta[B_AXIS], cart[Z_AXIS], cart[E_AXIS], SQRT(diff2) * inverse_secs, active_extruder);
#else
planner.buffer_line_kinematic(cart, fr_mm_s, active_extruder);
#endif
// As far as the parser is concerned, the position is now == target. In reality the
// motion control system might still be processing the action and the real tool position