Incorrect shapes

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  • February 22, 2015 at 9:28 am #7429
    FrankK
    Member

    Hi,

    I’m building a large wood router with my son Bram (11y) and are using the TinyG v8 to drive it. We’re also using the TinyG v8 in a 3040 Chinese CNC router and that runs perfect. The g-code file on the 3040 CNC router turns out great but the same file on the bigger router gives different shapes.

    Two routed MDF pinion shapes

    More detail of the correct result on the small 3040 cnc router:

    Correct result on the 3040 mini CNC

    More detail of the result on the large wood router:

    Incorrect result on the large wood router with the same gcode

    Also an example of a circle. In Chilipeppr it looks like a perfect circle:
    Gcode for a circle

    This is the code for the circle:
    G21G17
    M6
    M3
    G4 3
    G0 X0.0000 Y0.0000 Z2.5400
    G0 X-21.2205 Y-21.2934
    G1 Z-2.0000 F200.0
    G3 X21.2396 Y21.3326 F2000.0 I21.230 J21.313
    G3 X-21.2205 Y-21.2934 I-21.230 J-21.313
    G0 Z2.5400
    M5

    And finally the Chilipeppr demo:
    Chilipeppr mm demo

    I don’t think we’re experiencing loss of pulses because the spindle returns to the check location perfectly. We’ve played with microstepping, Chordal tolerances and junction deviation but all the same results. We also tried running the same shape without curve fitting (no g2 or g3 only g0 and g1 codes) with the same result.

    We’re running NEMA23 2.5A/10mH/2.5Nm steppers with two of them on the Gantry (motor 2 and 4) and 30Volts on the TinyG. The poulies on the X and Y have a circumference of approx 120mm. Z has a TR (travel per revolution) of only 5mm.

    Could someone point us in the right direction? We’ve been searching the wiki’s and fora’s but with no luck.

    Kind regards,

    Frank and Bram

    Here the TinyG dump:

    [fb] firmware build 438.02
    [fb] firmware build 438.02
    [fv] firmware version 0.97
    [hp] hardware platform 1.00
    [hv] hardware version 8.00
    [id] TinyG ID 3X3566-SPB
    [fv] firmware version 0.97
    [hp] hardware platform 1.00
    [hv] hardware version 8.00
    [id] TinyG ID 3X3566-SPB
    [ja] junction acceleration 100000 mm
    [ct] chordal tolerance 0.0100 mm
    [ja] junction acceleration 100000 mm
    [ct] chordal tolerance 0.0100 mm
    [sl] soft limit enable 0
    [st] switch type 1 [0=NO,1=NC]
    [sl] soft limit enable 0
    [st] switch type 1 [0=NO,1=NC]
    [mt] motor idle timeout 2.00 Sec
    [ej] enable json mode 0 [0=text,1=JSON]
    [mt] motor idle timeout 2.00 Sec
    [ej] enable json mode 0 [0=text,1=JSON]
    [jv] json verbosity 1 [0=silent,1=footer,2=messages,3=configs,4=linenum,5=verbose]
    [js] json serialize style 1 [0=relaxed,1=strict]
    [jv] json verbosity 1 [0=silent,1=footer,2=messages,3=configs,4=linenum,5=verbose]
    [js] json serialize style 1 [0=relaxed,1=strict]
    [tv] text verbosity 0 [0=silent,1=verbose]
    [qv] queue report verbosity 2 [0=off,1=single,2=triple]
    [tv] text verbosity 0 [0=silent,1=verbose]
    [qv] queue report verbosity 2 [0=off,1=single,2=triple]
    [sv] status report verbosity 1 [0=off,1=filtered,2=verbose]
    [si] status interval 250 ms
    [ec] expand LF to CRLF on TX 0 [0=off,1=on]
    [ee] enable echo 0 [0=off,1=on]
    [ex] enable flow control 1 [0=off,1=XON/XOFF, 2=RTS/CTS]
    [baud] USB baud rate 5 [1=9600,2=19200,3=38400,4=57600,5=115200,6=230400]
    [net] network mode 0 [0=master]
    [gpl] default gcode plane 0 [0=G17,1=G18,2=G19]
    [sv] status report verbosity 1 [0=off,1=filtered,2=verbose]
    [si] status interval 250 ms
    [ec] expand LF to CRLF on TX 0 [0=off,1=on]
    [ee] enable echo 0 [0=off,1=on]
    [ex] enable flow control 1 [0=off,1=XON/XOFF, 2=RTS/CTS]
    [baud] USB baud rate 5 [1=9600,2=19200,3=38400,4=57600,5=115200,6=230400]
    [net] network mode 0 [0=master]
    [gpl] default gcode plane 0 [0=G17,1=G18,2=G19]
    [gun] default gcode units mode 1 [0=G20,1=G21]
    [gco] default gcode coord system 1 [1-6 (G54-G59)]
    [gun] default gcode units mode 1 [0=G20,1=G21]
    [gco] default gcode coord system 1 [1-6 (G54-G59)]
    [gpa] default gcode path control 2 [0=G61,1=G61.1,2=G64]
    [gdi] default gcode distance mode 0 [0=G90,1=G91]
    [gpa] default gcode path control 2 [0=G61,1=G61.1,2=G64]
    [gdi] default gcode distance mode 0 [0=G90,1=G91]
    [1ma] m1 map to axis 0 [0=X,1=Y,2=Z…]
    [1sa] m1 step angle 1.800 deg
    [1ma] m1 map to axis 0 [0=X,1=Y,2=Z…]
    [1sa] m1 step angle 1.800 deg
    [1tr] m1 travel per revolution 120.0100 mm
    [1mi] m1 microsteps 8 [1,2,4,8]
    [1tr] m1 travel per revolution 120.0100 mm
    [1mi] m1 microsteps 8 [1,2,4,8]
    [1po] m1 polarity 0 [0=normal,1=reverse]
    [1pm] m1 power management 1 [0=disabled,1=always on,2=in cycle,3=when moving]
    [1po] m1 polarity 0 [0=normal,1=reverse]
    [1pm] m1 power management 1 [0=disabled,1=always on,2=in cycle,3=when moving]
    [2ma] m2 map to axis 1 [0=X,1=Y,2=Z…]
    [2sa] m2 step angle 1.800 deg
    [2tr] m2 travel per revolution 119.4127 mm
    [2ma] m2 map to axis 1 [0=X,1=Y,2=Z…]
    [2sa] m2 step angle 1.800 deg
    [2mi] m2 microsteps 8 [1,2,4,8]
    [2po] m2 polarity 1 [0=normal,1=reverse]
    [2pm] m2 power management 1 [0=disabled,1=always on,2=in cycle,3=when moving]
    [2tr] m2 travel per revolution 119.4127 mm
    [2mi] m2 microsteps 8 [1,2,4,8]
    [2po] m2 polarity 1 [0=normal,1=reverse]
    [2pm] m2 power management 1 [0=disabled,1=always on,2=in cycle,3=when moving]
    [3ma] m3 map to axis 2 [0=X,1=Y,2=Z…]
    [3sa] m3 step angle 1.800 deg
    [3ma] m3 map to axis 2 [0=X,1=Y,2=Z…]
    [3sa] m3 step angle 1.800 deg
    [3tr] m3 travel per revolution 5.0000 mm
    [3mi] m3 microsteps 8 [1,2,4,8]
    [3tr] m3 travel per revolution 5.0000 mm
    [3mi] m3 microsteps 8 [1,2,4,8]
    [3po] m3 polarity 0 [0=normal,1=reverse]
    [3po] m3 polarity 0 [0=normal,1=reverse]
    [3pm] m3 power management 1 [0=disabled,1=always on,2=in cycle,3=when moving]
    [3pm] m3 power management 1 [0=disabled,1=always on,2=in cycle,3=when moving]
    [4ma] m4 map to axis 1 [0=X,1=Y,2=Z…]
    [4sa] m4 step angle 1.800 deg
    [4ma] m4 map to axis 1 [0=X,1=Y,2=Z…]
    [4sa] m4 step angle 1.800 deg
    [4tr] m4 travel per revolution 119.4127 mm
    [4mi] m4 microsteps 8 [1,2,4,8]
    [4tr] m4 travel per revolution 119.4127 mm
    [4mi] m4 microsteps 8 [1,2,4,8]
    [4po] m4 polarity 0 [0=normal,1=reverse]
    [4pm] m4 power management 1 [0=disabled,1=always on,2=in cycle,3=when moving]
    [4po] m4 polarity 0 [0=normal,1=reverse]
    [4pm] m4 power management 1 [0=disabled,1=always on,2=in cycle,3=when moving]
    [xam] x axis mode 1 [standard]
    [xam] x axis mode 1 [standard]
    [xvm] x velocity maximum 30000 mm/min
    [xfr] x feedrate maximum 1000 mm/min
    [xvm] x velocity maximum 30000 mm/min
    [xfr] x feedrate maximum 1000 mm/min
    [xtn] x travel minimum 0.000 mm
    [xtn] x travel minimum 0.000 mm
    [xtm] x travel maximum 150.000 mm
    [xjm] x jerk maximum 100 mm/min^3 * 1 million
    [xtm] x travel maximum 150.000 mm
    [xjm] x jerk maximum 100 mm/min^3 * 1 million
    [xjh] x jerk homing 20 mm/min^3 * 1 million
    [xjd] x junction deviation 0.0500 mm (larger is faster)
    [xjh] x jerk homing 20 mm/min^3 * 1 million
    [xjd] x junction deviation 0.0500 mm (larger is faster)
    [xsn] x switch min 0 [0=off,1=homing,2=limit,3=limit+homing]
    [xsx] x switch max 0 [0=off,1=homing,2=limit,3=limit+homing]
    [xsn] x switch min 0 [0=off,1=homing,2=limit,3=limit+homing]
    [xsx] x switch max 0 [0=off,1=homing,2=limit,3=limit+homing]
    [xsv] x search velocity 500 mm/min
    [xlv] x latch velocity 100 mm/min
    [xsv] x search velocity 500 mm/min
    [xlv] x latch velocity 100 mm/min
    [xlb] x latch backoff 5.000 mm
    [xlb] x latch backoff 5.000 mm
    [xzb] x zero backoff 1.000 mm
    [yam] y axis mode 1 [standard]
    [yvm] y velocity maximum 20000 mm/min
    [xzb] x zero backoff 1.000 mm
    [yam] y axis mode 1 [standard]
    [yvm] y velocity maximum 20000 mm/min
    [yfr] y feedrate maximum 1000 mm/min
    [ytn] y travel minimum 0.000 mm
    [yfr] y feedrate maximum 1000 mm/min
    [ytn] y travel minimum 0.000 mm
    [ytm] y travel maximum 150.000 mm
    [ytm] y travel maximum 150.000 mm
    [yjm] y jerk maximum 50 mm/min^3 * 1 million
    [yjh] y jerk homing 20 mm/min^3 * 1 million
    [yjm] y jerk maximum 50 mm/min^3 * 1 million
    [yjh] y jerk homing 20 mm/min^3 * 1 million
    [yjd] y junction deviation 0.0500 mm (larger is faster)
    [yjd] y junction deviation 0.0500 mm (larger is faster)
    [ysn] y switch min 1 [0=off,1=homing,2=limit,3=limit+homing]
    [ysx] y switch max 0 [0=off,1=homing,2=limit,3=limit+homing]
    [ysn] y switch min 1 [0=off,1=homing,2=limit,3=limit+homing]
    [ysx] y switch max 0 [0=off,1=homing,2=limit,3=limit+homing]
    [ysv] y search velocity 1000 mm/min
    [ylv] y latch velocity 1000 mm/min
    [ysv] y search velocity 1000 mm/min
    [ylv] y latch velocity 1000 mm/min
    [ylb] y latch backoff 5.000 mm
    [yzb] y zero backoff 1.000 mm
    [ylb] y latch backoff 5.000 mm
    [yzb] y zero backoff 1.000 mm
    [zam] z axis mode 1 [standard]
    [zvm] z velocity maximum 5000 mm/min
    [zam] z axis mode 1 [standard]
    [zvm] z velocity maximum 5000 mm/min
    [zfr] z feedrate maximum 1000 mm/min
    [ztn] z travel minimum 0.000 mm
    [zfr] z feedrate maximum 1000 mm/min
    [ztn] z travel minimum 0.000 mm
    [ztm] z travel maximum 75.000 mm
    [zjm] z jerk maximum 50 mm/min^3 * 1 million
    [ztm] z travel maximum 75.000 mm
    [zjm] z jerk maximum 50 mm/min^3 * 1 million
    [zjh] z jerk homing 20 mm/min^3 * 1 million
    [zjd] z junction deviation 0.0500 mm (larger is faster)
    [zjh] z jerk homing 20 mm/min^3 * 1 million
    [zjd] z junction deviation 0.0500 mm (larger is faster)
    [zsn] z switch min 0 [0=off,1=homing,2=limit,3=limit+homing]
    [zsx] z switch max 1 [0=off,1=homing,2=limit,3=limit+homing]
    [zsn] z switch min 0 [0=off,1=homing,2=limit,3=limit+homing]
    [zsx] z switch max 1 [0=off,1=homing,2=limit,3=limit+homing]
    [zsv] z search velocity 400 mm/min
    [zlv] z latch velocity 100 mm/min
    [zsv] z search velocity 400 mm/min
    [zlv] z latch velocity 100 mm/min
    [zlb] z latch backoff 5.000 mm
    [zzb] z zero backoff 1.000 mm
    [zlb] z latch backoff 5.000 mm
    [zzb] z zero backoff 1.000 mm
    [aam] a axis mode 1 [standard]
    [avm] a velocity maximum 230400 deg/min
    [aam] a axis mode 1 [standard]
    [avm] a velocity maximum 230400 deg/min
    [afr] a feedrate maximum 230400 deg/min
    [atn] a travel minimum -1.000 deg
    [afr] a feedrate maximum 230400 deg/min
    [atn] a travel minimum -1.000 deg
    [atm] a travel maximum -1.000 deg
    [ajm] a jerk maximum 5760 deg/min^3 * 1 million
    [atm] a travel maximum -1.000 deg
    [ajm] a jerk maximum 5760 deg/min^3 * 1 million
    [ajh] a jerk homing 5760 deg/min^3 * 1 million
    [ajd] a junction deviation 0.0500 deg (larger is faster)
    [ajh] a jerk homing 5760 deg/min^3 * 1 million
    [ajd] a junction deviation 0.0500 deg (larger is faster)
    [ara] a radius value 0.1990 deg
    [asn] a switch min 1 [0=off,1=homing,2=limit,3=limit+homing]
    [ara] a radius value 0.1990 deg
    [asn] a switch min 1 [0=off,1=homing,2=limit,3=limit+homing]
    [asx] a switch max 0 [0=off,1=homing,2=limit,3=limit+homing]
    [asv] a search velocity 600 deg/min
    [asx] a switch max 0 [0=off,1=homing,2=limit,3=limit+homing]
    [asv] a search velocity 600 deg/min
    [alv] a latch velocity 100 deg/min
    [alb] a latch backoff 5.000 deg
    [alv] a latch velocity 100 deg/min
    [alb] a latch backoff 5.000 deg
    [azb] a zero backoff 2.000 deg
    [bam] b axis mode 0 [disabled]
    [azb] a zero backoff 2.000 deg
    [bam] b axis mode 0 [disabled]
    [bvm] b velocity maximum 3600 deg/min
    [bfr] b feedrate maximum 3600 deg/min
    [bvm] b velocity maximum 3600 deg/min
    [bfr] b feedrate maximum 3600 deg/min
    [btn] b travel minimum -1.000 deg
    [btm] b travel maximum -1.000 deg
    [btn] b travel minimum -1.000 deg
    [btm] b travel maximum -1.000 deg
    [bjm] b jerk maximum 20 deg/min^3 * 1 million
    [bjd] b junction deviation 0.0500 deg (larger is faster)
    [bjm] b jerk maximum 20 deg/min^3 * 1 million
    [bjd] b junction deviation 0.0500 deg (larger is faster)
    [bra] b radius value 1.0000 deg
    [cam] c axis mode 0 [disabled]
    [bra] b radius value 1.0000 deg
    [cam] c axis mode 0 [disabled]
    [cvm] c velocity maximum 3600 deg/min
    [cfr] c feedrate maximum 3600 deg/min
    [cvm] c velocity maximum 3600 deg/min
    [cfr] c feedrate maximum 3600 deg/min
    [ctn] c travel minimum -1.000 deg
    [ctm] c travel maximum -1.000 deg
    [ctn] c travel minimum -1.000 deg
    [ctm] c travel maximum -1.000 deg
    [cjm] c jerk maximum 20 deg/min^3 * 1 million
    [cjd] c junction deviation 0.0500 deg (larger is faster)
    [cjm] c jerk maximum 20 deg/min^3 * 1 million
    [cjd] c junction deviation 0.0500 deg (larger is faster)
    [cra] c radius value 1.0000 deg
    [p1frq] pwm frequency 100 Hz
    [cra] c radius value 1.0000 deg
    [p1frq] pwm frequency 100 Hz
    [p1csl] pwm cw speed lo 1000 RPM
    [p1csh] pwm cw speed hi 2000 RPM
    [p1csl] pwm cw speed lo 1000 RPM
    [p1csh] pwm cw speed hi 2000 RPM
    [p1cpl] pwm cw phase lo 0.125 [0..1]
    [p1cph] pwm cw phase hi 0.200 [0..1]
    [p1cpl] pwm cw phase lo 0.125 [0..1]
    [p1cph] pwm cw phase hi 0.200 [0..1]
    [p1wsl] pwm ccw speed lo 1000 RPM
    [p1wsh] pwm ccw speed hi 2000 RPM
    [p1wsl] pwm ccw speed lo 1000 RPM
    [p1wsh] pwm ccw speed hi 2000 RPM
    [p1wpl] pwm ccw phase lo 0.125 [0..1]
    [p1wph] pwm ccw phase hi 0.200 [0..1]
    [p1wpl] pwm ccw phase lo 0.125 [0..1]
    [p1wph] pwm ccw phase hi 0.200 [0..1]
    [p1pof] pwm phase off 0.100 [0..1]
    [g54x] g54 x offset 0.000 mm
    [p1pof] pwm phase off 0.100 [0..1]
    [g54x] g54 x offset 0.000 mm
    [g54y] g54 y offset 0.000 mm
    [g54z] g54 z offset 0.000 mm
    [g54y] g54 y offset 0.000 mm
    [g54z] g54 z offset 0.000 mm
    [g54a] g54 a offset 0.000 deg
    [g54b] g54 b offset 0.000 deg
    [g54a] g54 a offset 0.000 deg
    [g54b] g54 b offset 0.000 deg
    [g54c] g54 c offset 0.000 deg
    [g55x] g55 x offset 75.000 mm
    [g54c] g54 c offset 0.000 deg
    [g55x] g55 x offset 75.000 mm
    [g55y] g55 y offset 75.000 mm
    [g55z] g55 z offset 0.000 mm
    [g55y] g55 y offset 75.000 mm
    [g55z] g55 z offset 0.000 mm
    [g55a] g55 a offset 0.000 deg
    [g55b] g55 b offset 0.000 deg
    [g55a] g55 a offset 0.000 deg
    [g55b] g55 b offset 0.000 deg
    [g55c] g55 c offset 0.000 deg
    [g56x] g56 x offset 0.000 mm
    [g55c] g55 c offset 0.000 deg
    [g56x] g56 x offset 0.000 mm
    [g56y] g56 y offset 0.000 mm
    [g56z] g56 z offset 0.000 mm
    [g56y] g56 y offset 0.000 mm
    [g56z] g56 z offset 0.000 mm
    [g56a] g56 a offset 0.000 deg
    [g56b] g56 b offset 0.000 deg
    [g56a] g56 a offset 0.000 deg
    [g56b] g56 b offset 0.000 deg
    [g56c] g56 c offset 0.000 deg
    [g57x] g57 x offset 0.000 mm
    [g56c] g56 c offset 0.000 deg
    [g57x] g57 x offset 0.000 mm
    [g57y] g57 y offset 0.000 mm
    [g57z] g57 z offset 0.000 mm
    [g57y] g57 y offset 0.000 mm
    [g57z] g57 z offset 0.000 mm
    [g57a] g57 a offset 0.000 deg
    [g57b] g57 b offset 0.000 deg
    [g57a] g57 a offset 0.000 deg
    [g57b] g57 b offset 0.000 deg
    [g57c] g57 c offset 0.000 deg
    [g58x] g58 x offset 0.000 mm
    [g57c] g57 c offset 0.000 deg
    [g58x] g58 x offset 0.000 mm
    [g58y] g58 y offset 0.000 mm
    [g58z] g58 z offset 0.000 mm
    [g58y] g58 y offset 0.000 mm
    [g58z] g58 z offset 0.000 mm
    [g58a] g58 a offset 0.000 deg
    [g58b] g58 b offset 0.000 deg
    [g58a] g58 a offset 0.000 deg
    [g58b] g58 b offset 0.000 deg
    [g58c] g58 c offset 0.000 deg
    [g59x] g59 x offset 0.000 mm
    [g58c] g58 c offset 0.000 deg
    [g59x] g59 x offset 0.000 mm
    [g59y] g59 y offset 0.000 mm
    [g59z] g59 z offset 0.000 mm
    [g59y] g59 y offset 0.000 mm
    [g59z] g59 z offset 0.000 mm
    [g59a] g59 a offset 0.000 deg
    [g59b] g59 b offset 0.000 deg
    [g59a] g59 a offset 0.000 deg
    [g59b] g59 b offset 0.000 deg
    [g59c] g59 c offset 0.000 deg
    [g92x] g92 x offset 0.000 mm
    [g59c] g59 c offset 0.000 deg
    [g92x] g92 x offset 0.000 mm
    [g92y] g92 y offset 0.000 mm
    [g92z] g92 z offset 0.000 mm
    [g92y] g92 y offset 0.000 mm
    [g92z] g92 z offset 0.000 mm
    [g92a] g92 a offset 0.000 deg
    [g92b] g92 b offset 0.000 deg
    [g92a] g92 a offset 0.000 deg
    [g92b] g92 b offset 0.000 deg
    [g92c] g92 c offset 0.000 deg
    [g28x] g28 x position 0.000 mm
    [g92c] g92 c offset 0.000 deg
    [g28x] g28 x position 0.000 mm
    [g28y] g28 y position 0.000 mm
    [g28z] g28 z position 0.000 mm
    [g28y] g28 y position 0.000 mm
    [g28z] g28 z position 0.000 mm
    [g28a] g28 a position 0.000 deg
    [g28b] g28 b position 0.000 deg
    [g28a] g28 a position 0.000 deg
    [g28b] g28 b position 0.000 deg
    [g28c] g28 c position 0.000 deg
    [g30x] g30 x position 0.000 mm
    [g28c] g28 c position 0.000 deg
    [g30x] g30 x position 0.000 mm
    [g30y] g30 y position 0.000 mm
    [g30z] g30 z position 0.000 mm
    [g30y] g30 y position 0.000 mm
    [g30z] g30 z position 0.000 mm
    [g30a] g30 a position 0.000 deg
    [g30b] g30 b position 0.000 deg
    [g30a] g30 a position 0.000 deg
    [g30b] g30 b position 0.000 deg
    [g30c] g30 c position 0.000 deg
    [g30c] g30 c position 0.000 deg

    February 23, 2015 at 6:55 am #7435
    cmcgrath5035
    Moderator

    Frank
    IIRC, the 3040 is a Threaded rod machine. Is your wood router belt driven, like a ShepeOko?
    I would be suspicious of power management settings on the wood machine, looks like the inactive motors may not be holding position. There is much less holding torques required on a rod machine.

    You could try setting your $mt=60 sec (experiment with it on a short job).
    I think there may be a issue with the Power manaagemnt FW that is still timing out motors when $_pm=1. That, and other issues, will be corrected soon in a new FW build.

    Your wood machine, with the large wheels, (resulting in large travels $_tr=120) has 1/3 the holding torque with the motors energized as well (compared to SO2 with $tr=40).
    Do you have the current pots maxed out? Yours is the largest $_tr I have seen, I’m not sure there is a lot of experience there.
    If you turn the motors on, can you move the gantry (against the holding torque) by hand?

    You settings listing above also looks strange, many , but not all, rows repeated. Could be the Forum tool. Configs are easier to view in an attached file. See

    • This reply was modified 9 years, 8 months ago by cmcgrath5035.
    February 23, 2015 at 8:28 am #7437
    FrankK
    Member

    The wood machine is indeed running with belts. I can move the gantry when the motors are energized but I have to put my back into it to do that. When milling the pinion shaped form a 2mm step was used for each run. So he did this in 8 passes and after that I checked of any pulses where lost by moving the mill to a certain known point and it was spot on. So I hope I can conclude from this that no steps were lost. I keep the power management constantly on. I was under the impression that $mt wasn’t important anymore when power management is constantly on. I’ll try $mt=60 and do a short run asap. The TR is rather large. It was the smallest pouly I could get with this wide belt. A reductor is pretty expensive so I tried this first.

    I also saw that the setting listing was strange. I checked my original file and the double entries are also there. Could it be that my TinyG is goofy and should be reset to factory default? Or is there another way? I checked earlier footage of the router scribing the Chilipeppr logo with a pen on paper at the point we had X and Y running for the first time. And the logo was ok then.

    Many thanks for helping,

    Frank and Bram

    February 23, 2015 at 11:31 am #7438
    FrankK
    Member

    Eureka!

    I’m a bit ashamed but it had nothing to do with the TinyG. It was a grub screw on the X belt pinion. Because there is a flat spot on the stepper motor shaft the belt would stand still in a certain spot only due to a loose screw. How on earth this could result in 8 runs of the same contour and fully symmetrical distortion and zero steps lost is pure bad luck. But in the end we’re very happy with the fact the machine is running and milling. A lot of people told us it couldn’t be done with the TinyG on 30Volts but it runs well. The inaccuracy isn’t that bad also as you can see in the Chilipeppr logo letters.

    Grub Screw tightened

    120mm/200 equals 0.6mm per step. I know mircostepping should help with accuracy but I’m very content with the result. We’re planning on milling larger wooden panels to make a buck to make an Aston Martin DBR1 replica on an old TVR chassis. The aluminum panels will be made based on this buck.

    Many thanks for the support.

    Frank and Bram

    • This reply was modified 9 years, 8 months ago by FrankK.
    February 23, 2015 at 11:35 am #7439
    FrankK
    Member

    Something wend wrong with the picture:

    Chilipeppr logo

    Greetings,

    Frank

    • This reply was modified 9 years, 8 months ago by FrankK.
    February 23, 2015 at 6:42 pm #7442
    FrankK
    Member

    I obviously mend that micro stepping should not help the resolution but the curves turned out better than expected. The letter ‘e’ is approx 8mm high.

    Frank

    February 24, 2015 at 7:26 am #7450
    cmcgrath5035
    Moderator

    Two loose screws in one 7 day period – an epidemic! (We always overlook the obvious, and reproducibility DOES seem to be a software trait, not mechanical).

    Your $$ listing does look strange.
    if it persists making double reports, then a $defa=1 and parameter reload might help. What are you using to send commands to the machine(CoolTerm, etc)?
    Edit – Well that was a dumb question, Chilipeppr of course. Before running $defa=1, try it in CoolTerm.

    Otherwise, you appear to be good. Have fun

    • This reply was modified 9 years, 8 months ago by cmcgrath5035.
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