LR3 Cutting Short

LowRider CNC Troubleshooting
1

My full sheet LR3 is not cutting full dimension on the Y axis for some reason. I noticed it a few weeks ago then got busy and forgot about it. Now I went to do something tonight. Cut should have been 990mm long, it came out 987ish. I have all stock motors, pullies, belt from Ryan on the machine. I thought maybe it could be something funny with Estlcam 12 so I loaded the same file in Estlcam 11 and got the identical thing. I am lost as to what to check from here. I know on a printer I would look at rotation distance / steps per mm, but that seems like it would be the same for all of us running the same hardware. But maybe I’m wrong. Any ideas of what to check would be very helpful! Also uploading a copy of my config just incase you see something in there that I missed.

Edit to add: I thought X was good but I just checked again, it should have been 67mm and it is 66mm.

board: Jackpot TMC2209
name: LowRider
meta: 10-30-2023 RyanZ
stepping: 
  engine: I2S_static
  idle_ms: 255
  pulse_us: 4
  dir_delay_us: 1
  disable_delay_us: 0
  segments: 12

uart1: 
  txd_pin: gpio.0
  rxd_pin: gpio.4
  rts_pin: NO_PIN
  cts_pin: NO_PIN
  baud: 115200
  mode: 8N1

#uart2: 
#  txd_pin: gpio.14
#  rxd_pin: gpio.15
#  rts_pin: gpio.13
#  cts_pin: NO_PIN
#  baud: 9600
#  mode: 8N1

i2so: 
  bck_pin: gpio.22
  data_pin: gpio.21
  ws_pin: gpio.17

spi: 
  miso_pin: gpio.19
  mosi_pin: gpio.23
  sck_pin: gpio.18

sdcard: 
  cs_pin: gpio.5
  card_detect_pin: NO_PIN
  frequency_hz: 20000000

kinematics: 
  Cartesian: 

axes: 
  shared_stepper_disable_pin: NO_PIN
  shared_stepper_reset_pin: NO_PIN
  homing_runs: 2
  x: 
    steps_per_mm: 50.000000
    max_rate_mm_per_min: 9000.000000
    acceleration_mm_per_sec2: 200.000000
    max_travel_mm: 1220.000000
    soft_limits: false
    homing: 
      cycle: 2
      allow_single_axis: true
      positive_direction: false
      mpos_mm: 0.000000
      feed_mm_per_min: 300.000000
      seek_mm_per_min: 1500.000000
      settle_ms: 500
      seek_scaler: 1.100000
      feed_scaler: 1.100000

    motor0: 
      limit_neg_pin: gpio.25
      limit_pos_pin: NO_PIN
      limit_all_pin: NO_PIN
      hard_limits: false
      pulloff_mm: 4.000000
      tmc_2209: 
        addr: 0
        cs_pin: NO_PIN
        uart_num: 1
        step_pin: I2SO.2
        direction_pin: I2SO.1
        disable_pin: I2SO.0
        r_sense_ohms: 0.110000
        run_amps: 0.900000
        hold_amps: 0.500000
        homing_amps: 0.800000
        microsteps: 8
        toff_disable: 0
        toff_stealthchop: 5
        use_enable: false
        run_mode: StealthChop
        homing_mode: StealthChop
        stallguard: 0
        stallguard_debug: false
        toff_coolstep: 3

  y: 
    steps_per_mm: 50.000000
    max_rate_mm_per_min: 9000.000000
    acceleration_mm_per_sec2: 200.000000
    max_travel_mm: 2440.000000
    soft_limits: false
    homing: 
      cycle: 3
      allow_single_axis: true
      positive_direction: false
      mpos_mm: 0.000000
      feed_mm_per_min: 300.000000
      seek_mm_per_min: 1500.000000
      settle_ms: 500
      seek_scaler: 1.100000
      feed_scaler: 1.100000

    motor0: 
      limit_neg_pin: gpio.33
      limit_pos_pin: NO_PIN
      limit_all_pin: NO_PIN
      hard_limits: false
      pulloff_mm: 6.150000
      tmc_2209: 
        addr: 1
        cs_pin: NO_PIN
        uart_num: 1
        step_pin: I2SO.5
        direction_pin: I2SO.4
        disable_pin: I2SO.7
        r_sense_ohms: 0.110000
        run_amps: 0.900000
        hold_amps: 0.500000
        homing_amps: 0.800000
        microsteps: 8
        toff_disable: 0
        toff_stealthchop: 5
        use_enable: false
        run_mode: StealthChop
        homing_mode: StealthChop
        stallguard: 0
        stallguard_debug: false
        toff_coolstep: 3

    motor1: 
      limit_neg_pin: gpio.35
      limit_pos_pin: NO_PIN
      limit_all_pin: NO_PIN
      hard_limits: false
      pulloff_mm: 4.000000
      tmc_2209: 
        addr: 3
        cs_pin: I2SO.14
        uart_num: 1
        step_pin: I2SO.13
        direction_pin: I2SO.12
        disable_pin: I2SO.15
        r_sense_ohms: 0.110000
        run_amps: 0.900000
        hold_amps: 0.500000
        homing_amps: 0.800000
        microsteps: 8
        toff_disable: 0
        toff_stealthchop: 5
        use_enable: false
        run_mode: StealthChop
        homing_mode: StealthChop
        stallguard: 0
        stallguard_debug: false
        toff_coolstep: 3

  z: 
    steps_per_mm: 200.000000
    max_rate_mm_per_min: 1200.000000
    acceleration_mm_per_sec2: 80.000000
    max_travel_mm: 300.000000
    soft_limits: false
    homing: 
      cycle: 1
      allow_single_axis: true
      positive_direction: true
      mpos_mm: 0.000000
      feed_mm_per_min: 300.000000
      seek_mm_per_min: 800.000000
      settle_ms: 500
      seek_scaler: 1.100000
      feed_scaler: 1.100000

    motor0: 
      limit_neg_pin: NO_PIN
      limit_pos_pin: gpio.32
      limit_all_pin: NO_PIN
      hard_limits: false
      pulloff_mm: 4.400000
      tmc_2209: 
        addr: 2
        cs_pin: NO_PIN
        uart_num: 1
        step_pin: I2SO.10
        direction_pin: I2SO.9
        disable_pin: I2SO.8
        r_sense_ohms: 0.110000
        run_amps: 0.900000
        hold_amps: 0.500000
        homing_amps: 0.900000
        microsteps: 8
        toff_disable: 0
        toff_stealthchop: 5
        use_enable: false
        run_mode: StealthChop
        homing_mode: StealthChop
        stallguard: 0
        stallguard_debug: false
        toff_coolstep: 3

    motor1: 
      limit_neg_pin: NO_PIN
      limit_pos_pin: gpio.34
      limit_all_pin: NO_PIN
      hard_limits: false
      pulloff_mm: 4.000000
      tmc_2209: 
        addr: 3
        cs_pin: I2SO.19
        uart_num: 1
        step_pin: I2SO.18
        direction_pin: I2SO.17
        disable_pin: I2SO.16
        r_sense_ohms: 0.110000
        run_amps: 0.900000
        hold_amps: 0.500000
        homing_amps: 0.900000
        microsteps: 8
        toff_disable: 0
        toff_stealthchop: 5
        use_enable: false
        run_mode: StealthChop
        homing_mode: StealthChop
        stallguard: 0
        stallguard_debug: false
        toff_coolstep: 3

control: 
  safety_door_pin: NO_PIN
  reset_pin: NO_PIN
  feed_hold_pin: NO_PIN
  cycle_start_pin: NO_PIN
  macro0_pin: NO_PIN
  macro1_pin: NO_PIN
  macro2_pin: NO_PIN
  macro3_pin: NO_PIN
  fault_pin: NO_PIN
  estop_pin: NO_PIN

coolant: 
  flood_pin: NO_PIN
  mist_pin: gpio.16
  delay_ms: 0

probe: 
  pin: gpio.36:low
  toolsetter_pin: NO_PIN
  check_mode_start: true

macros: 
  startup_line0: 
  startup_line1: 
  macro0: 
  macro1: 
  macro2: 
  macro3: 
  after_homing: 
  after_reset: 
  after_unlock: 

start: 
  must_home: false
  deactivate_parking: false
  check_limits: false

parking: 
  enable: false
  axis: Z
  target_mpos_mm: -5.000000
  rate_mm_per_min: 800.000000
  pullout_distance_mm: 5.000000
  pullout_rate_mm_per_min: 250.000000

user_outputs: 
  analog0_pin: NO_PIN
  analog1_pin: NO_PIN
  analog2_pin: NO_PIN
  analog3_pin: NO_PIN
  analog0_hz: 5000
  analog1_hz: 5000
  analog2_hz: 5000
  analog3_hz: 5000
  digital0_pin: gpio.26
  digital1_pin: NO_PIN
  digital2_pin: gpio.2
  digital3_pin: NO_PIN
  digital4_pin: NO_PIN
  digital5_pin: NO_PIN
  digital6_pin: NO_PIN
  digital7_pin: NO_PIN

#Huanyang: 
#  uart_num: 2
#  modbus_id: 1
#  spinup_ms: 0
#  spindown_ms: 0
#  tool_num: 0
#  speed_map: 0=0.00% 0=25.00% 6000=25.00% 24000=100.00%
#  off_on_alarm: false

arc_tolerance_mm: 0.002000
junction_deviation_mm: 0.010000
verbose_errors: false
report_inches: false
enable_parking_override_control: false
use_line_numbers: false
planner_blocks: 32

config.zip (1.6 KB)

2

Check your grubscrews then check if the error is absolute or proportional - is it always out by the same amount no matter how far you travel or on a move half the distance is the error half. Also give your core a good jiggle to see if there’s any slop.

2 Likes
3

Following because mine is off too

1 Like
4

I checked this morning and found the bottom of the core was a little loose. So I tightened it up just enough to get the wiggle out. Made another cut and this time my width was dead on but I was still 2mm short on the length (Y direction) I also checked the grub screws they are tight as can be with loctite so its not that. I also checked the prusa calculator for our setup and its dead on right at 50 steps per mm so idk what to check next lol

5

I would try an air cut, using a v bit, then lower the Z axis just enough to make a small mark at each end of the travel.

This might tell you if it is deflection or a distance issue.

1 Like
6

Not a bad idea. I can sure try that