Alex_b

Hi, I’m not sure if I filtered this right but here is the serial output below. Jogged the y back and forth 1 mm before and after a new save. I’m in json v1.80

G91 G0 Y1
G90
G91 G0 Y-1
G90
G91 G0 Y1
G90
{“x”:{“am”:1,”sn”:3,”vm”:5000,”sx”:0,”fr”:5000,”sv”:350,”tm”:860,”lv”:100,”tn”:0,”lb”:15,”jd”:0.05,”zb”:3,”jm”:1000,”jh”:4000}}
{“y”:{“am”:1,”sn”:3,”vm”:5000,”sx”:0,”fr”:5000,”sv”:350,”tm”:1210,”lv”:100,”tn”:0,”lb”:15,”jd”:0.05,”zb”:3,”jm”:1000,”jh”:5000}}
{“z”:{“am”:1,”sn”:0,”vm”:2000,”sx”:3,”fr”:2000,”sv”:250,”tm”:0,”lv”:100,”tn”:-75,”lb”:3,”jd”:0.05,”zb”:3,”jm”:2000,”jh”:7000}}
{“a”:{“am”:0,”sn”:1,”vm”:25920,”sx”:0,”fr”:12960,”sv”:2000,”tm”:-1,”lv”:2000,”tn”:-1,”lb”:5,”jd”:0.1,”zb”:2,”jm”:324000,”jh”:324000,”ra”:5.305}}
{“1”:{“ma”:1,”pm”:2,”po”:1,”tr”:60,”mi”:2,”sa”:1.8}}
{“2”:{“ma”:1,”pm”:2,”po”:0,”tr”:60,”mi”:2,”sa”:1.8}}
{“3”:{“ma”:0,”pm”:2,”po”:1,”tr”:60,”mi”:2,”sa”:1.8}}
{“4”:{“ma”:2,”pm”:2,”po”:0,”tr”:8,”mi”:2,”sa”:1.8}}
G91 G0 Y1 <————-goes backwards in(-) direction
G90
G91 G0 Y-1 <————-goes backwards in(-) direction AGAIN
G90
G91 G0 Y1 <————-goes forwards in(+) direction
G90

This has to be repeated for every axis otherwise any positive move in Z, for example, will plunge into the table. If this action is not cleared, by
the back and forth jog, any gcode run will keep the screwed up setting and get up to all sorts of shenanigans as soon as I press ‘play’. The dual y motors on the first jog after a new save will twist the gantry until the 2nd jog command is sent. Another thing I noticed is that the gantry will continue to twist until a reversed jog command is sent, if I sent the same jog command over and over again, it will continue the incorrect movement.

Hope this info helps. Thx!

Hi,

I have been having this EXACT same issue. I was originally using JSON 1.80 and 440.18 of TinyG firmware. Whenever I saved new configuration setting, the axes would reverse themselves. For instance when homing right after saving a new setting, the 2 Y-axis motors would suddenly be different polarities and start grinding the belt and twisting the gantry.

To fix I would need to jog back and forth a few times then the direction would correct itself. I have also been having jerky motion as mentioned previously, sometimes the gcode would experience stalls and slowdowns. For example an easy 200mm/min move would move perfectly fine one minute, then all of a sudden slow to 6mm/min velocity like it just hit the brakes. This slowdown also always occurs at the end of every job on the last few 10s of lines of gcode.

I have tried every last combo of every single setting in the gcode options widget to no avail. TinyG settings below:

// Response from $$ Command
[fb] firmware build 440.18
[fv] firmware version 0.97
[hp] hardware platform 1.00
[hv] hardware version 8.00
[id] TinyG ID 3X3566-MPF
[ja] junction acceleration 100000 mm
[ct] chordal tolerance 0.0100 mm
[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]
[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 1 [0=silent,1=verbose]
[qv] queue report verbosity 1 [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]
[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]
[1ma] m1 map to axis 1 [0=X,1=Y,2=Z…]
[1sa] m1 step angle 1.800 deg
[1tr] m1 travel per revolution 60.0000 mm
[1mi] m1 microsteps 2 [1,2,4,8]
[1po] m1 polarity 1 [0=normal,1=reverse]
[1pm] m1 power management 2 [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 60.0000 mm
[2mi] m2 microsteps 2 [1,2,4,8]
[2po] m2 polarity 0 [0=normal,1=reverse]
[2pm] m2 power management 2 [0=disabled,1=always on,2=in cycle,3=when moving]
[3ma] m3 map to axis 0 [0=X,1=Y,2=Z…]
[3sa] m3 step angle 1.800 deg
[3tr] m3 travel per revolution 60.0000 mm
[3mi] m3 microsteps 2 [1,2,4,8]
[3po] m3 polarity 1 [0=normal,1=reverse]
[3pm] m3 power management 2 [0=disabled,1=always on,2=in cycle,3=when moving]
[4ma] m4 map to axis 2 [0=X,1=Y,2=Z…]
[4sa] m4 step angle 1.800 deg
[4tr] m4 travel per revolution 8.0000 mm
[4mi] m4 microsteps 1 [1,2,4,8]
[4po] m4 polarity 0 [0=normal,1=reverse]
[4pm] m4 power management 2 [0=disabled,1=always on,2=in cycle,3=when moving]
[xam] x axis mode 1 [standard]
[xvm] x velocity maximum 2500 mm/min
[xfr] x feedrate maximum 5000 mm/min
[xtn] x travel minimum 0.000 mm
[xtm] x travel maximum 860.000 mm
[xjm] x jerk maximum 1000 mm/min^3 * 1 million
[xjh] x jerk homing 3000 mm/min^3 * 1 million
[xjd] x junction deviation 0.0200 mm (larger is faster)
[xsn] x switch min 1 [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 350 mm/min
[xlv] x latch velocity 100 mm/min
[xlb] x latch backoff 15.000 mm
[xzb] x zero backoff 3.000 mm
[yam] y axis mode 1 [standard]
[yvm] y velocity maximum 2500 mm/min
[yfr] y feedrate maximum 5000 mm/min
[ytn] y travel minimum 0.000 mm
[ytm] y travel maximum 1210.000 mm
[yjm] y jerk maximum 1000 mm/min^3 * 1 million
[yjh] y jerk homing 5000 mm/min^3 * 1 million
[yjd] y junction deviation 0.0200 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]
[ysv] y search velocity 350 mm/min
[ylv] y latch velocity 100 mm/min
[ylb] y latch backoff 20.000 mm
[yzb] y zero backoff 3.000 mm
[zam] z axis mode 1 [standard]
[zvm] z velocity maximum 1000 mm/min
[zfr] z feedrate maximum 2000 mm/min
[ztn] z travel minimum -75.000 mm
[ztm] z travel maximum 0.000 mm
[zjm] z jerk maximum 250 mm/min^3 * 1 million
[zjh] z jerk homing 1000 mm/min^3 * 1 million
[zjd] z junction deviation 0.0100 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]
[zsv] z search velocity 200 mm/min
[zlv] z latch velocity 100 mm/min
[zlb] z latch backoff 3.000 mm
[zzb] z zero backoff 2.000 mm
[aam] a axis mode 0 [disabled]
[avm] a velocity maximum 0 deg/min
[afr] a feedrate maximum 0 deg/min
[atn] a travel minimum 0.000 deg
[atm] a travel maximum 0.000 deg
[ajm] a jerk maximum 0 deg/min^3 * 1 million
[ajh] a jerk homing 0 deg/min^3 * 1 million
[ajd] a junction deviation 0.0000 deg (larger is faster)
[ara] a radius value 0.0000 deg
[asn] a switch min 0 [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 0 deg/min
[alv] a latch velocity 0 deg/min
[alb] a latch backoff 0.000 deg
[azb] a zero backoff 0.000 deg
[bam] b axis mode 0 [disabled]
[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
[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]
[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
[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
[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]
[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]
[p1pof] pwm phase off 0.100 [0..1]

Sorry to spam even more but recently after upgrading to SPJS 1.83, Chilipeppr will no longer send any commands to TinyG even though it seems to connect perfectly. Coolterm has zero issues connecting though which is very strange.

In short I’m having identical issues to the poster above.