Z axis is slipping on one side

New Home Forum LowRider Troubleshooting – LowRider Z axis is slipping on one side

This topic contains 6 replies, has 5 voices, and was last updated by  Ryan 2 weeks, 3 days ago.

Viewing 7 posts - 1 through 7 (of 7 total)
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  • #108541

    TJ
    Participant

    My new machine is running great except for one problem:  the z axis is occasionally dropping down on one side. I’ll start a cut and make sure its level (its often not), and then 10 minutes into a cut it’ll be uneven. Most recently the cut was ruined because the router assembly dropped all the way down and got stuck on the board. Pictures of both sides attached.

    Its not slipping on the z tubes, it seems to actually be loose inside the stepper and just kind of drop with gravity (I can apply a few pounds of pressure from top and the vertical screw spins the z axis down on this side).

    Is there something I need to tighten, or is my stepper faulty? Or any other ideas?

    #108612

    Barry
    Participant

    Could be a loose wire.

    #108623

    Krzysztof Rygwelski
    Participant

    Im guessing that setscrews in couplers lose up. tight them up and use Loctite.

    #108627

    TJ
    Participant

    The set screws are tight, so that’s not it.

     

    #108631

    TJ
    Participant

    Update:

    It appears that when I connect from my laptop through repetier host, it resets the mini rambo. It’s at this time that the z-axis drops on one side (but never the other).  This is dangerous for my bit, but also gets me out of alignment everytime.

    So I thought that it sometimes got out of alignment during the run, but now I’m thinking it only happens when I connect, but sometimes it only drops part way, so I hadn’t noticed it right away.

    My understanding is that reset during connection is normal, is that correct?  If so, how do I prevent the stepper motor from letting the z-axis drop when I connect from my computer through Repetier Host?

     

    I’m not sure if this helps, but here’s the log when I connect and the z-axis on one side drops:

    13:58:40.026 : start
    13:58:40.032 : echo:Marlin bugfix-2.0.x
    13:58:40.033 : echo: Last Updated: 2018-01-20 | Author: (V1 Engineering, Ryan, 302)
    13:58:40.033 : echo:Compiled: Jul 31 2019
    13:58:40.033 : echo: Free Memory: 3639 PlannerBufferBytes: 1472
    13:58:40.034 : echo:Hardcoded Default Settings Loaded
    13:58:40.034 : echo: G21 ; Units in mm (mm)
    13:58:40.038 : echo: M149 C ; Units in Celsius
    13:58:40.039 : echo:Filament settings: Disabled
    13:58:40.039 : echo: M200 D3.00
    13:58:40.039 : echo: M200 D0
    13:58:40.039 : echo:Steps per unit:
    13:58:40.043 : echo: M92 X100.00 Y100.00 Z400.00 E100.00
    13:58:40.043 : echo:Maximum feedrates (units/s):
    13:58:40.047 : echo: M203 X120.00 Y120.00 Z30.00 E25.00
    13:58:40.047 : echo:Maximum Acceleration (units/s2):
    13:58:40.051 : echo: M201 X400.00 Y400.00 Z200.00 E2000.00
    13:58:40.055 : echo:Acceleration (units/s2): P<print_accel> R<retract_accel> T<travel_accel>
    13:58:40.055 : echo: M204 P400.00 R3000.00 T400.00
    13:58:40.059 : echo:Advanced: B<min_segment_time_us> S<min_feedrate> T<min_travel_feedrate> J<junc_dev>
    13:58:40.059 : echo: M205 B20000.00 S0.00 T0.00 J0.00
    13:58:40.059 : echo:Home offset:
    13:58:40.063 : echo: M206 X0.00 Y0.00 Z0.00
    13:58:40.063 : echo:Material heatup parameters:
    13:58:40.063 : echo: M145 S0 H196 B92 F0
    13:58:40.067 : echo: M145 S1 H240 B110 F0
    13:58:40.067 : echo:PID settings:
    13:58:40.067 : echo: M301 P17.98 I0.98 D83.62
    13:58:40.068 : echo:Stepper motor currents:
    13:58:40.071 : echo: M907 X900 Z900 E900
    13:58:40.216 : N1 M110*34
    13:58:40.216 : N2 M115*36
    13:58:40.216 : N3 M105*36
    13:58:40.216 : N4 M114*35
    13:58:40.275 : N5 M111 S6*98
    13:58:40.277 : N6 T0*60
    13:58:40.278 : N7 M20*22
    13:58:40.278 : N8 M80*19
    13:58:40.278 : N9 M105*46
    13:58:43.385 : N10 M105*22
    13:58:45.647 : N11 M220 S58*109
    13:58:45.650 : Cap:SERIAL_XON_XOFF:0
    13:58:45.651 : Cap:EEPROM:0
    13:58:45.651 : Cap:VOLUMETRIC:1
    13:58:45.652 : Cap:AUTOREPORT_TEMP:1
    13:58:45.652 : Cap:PROGRESS:0
    13:58:45.652 : Cap:PRINT_JOB:1
    13:58:45.654 : Cap:AUTOLEVEL:0
    13:58:45.654 : Cap:Z_PROBE:0
    13:58:45.654 : Cap:LEVELING_DATA:0
    13:58:45.654 : Cap:BUILD_PERCENT:0
    13:58:45.654 : Cap:SOFTWARE_POWER:0
    13:58:45.658 : Cap:TOGGLE_LIGHTS:0
    13:58:45.659 : Cap:CASE_LIGHT_BRIGHTNESS:0
    13:58:45.659 : Cap:EMERGENCY_PARSER:0
    13:58:45.659 : Cap:AUTOREPORT_SD_STATUS:0
    13:58:45.662 : Cap:THERMAL_PROTECTION:1
    13:58:45.662 : Cap:MOTION_MODES:1
    13:58:45.680 : N12 M221 S100*83
    13:58:45.695 : N13 M111 S6*85
    13:58:45.711 : echo:DEBUG:INFO,ERRORS
    13:58:45.712 : Begin file list
    13:58:45.712 : N14 T0*15
    13:58:45.712 : N15 M155 S1*84
    13:58:45.716 : End file list
    13:58:45.716 : echo:Unknown command: "M80"
    13:58:45.724 : echo:DEBUG:INFO,ERRORS

    #108647

    Dan Roesch
    Participant

    I don’t use Repetier but I rest my Lowrider on two cradles that keep it level and the bit off the work surface until I power things up and the steppers engage. Maybe that could also be a solution to your situation?

     

    Dan

    #108662

    Ryan
    Keymaster

    My understanding is that reset during connection is normal, is that correct? If so, how do I prevent the stepper motor from letting the z-axis drop when I connect from my computer through Repetier Host?

    Yes. Connect then position your router, or use and LCD and SD card.

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