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Type: Posts; User: CitizenOfDreams

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  1. Replies
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    Re: Debug Lead

    Your adapter will show in the Device Manager as either a COM port (if the drivers are installed) or as an unknown device (if the drivers are not installed yet).

    If it shows as an unknown device,...
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    Re: Debug Lead

    According to the manual, the RJ11 connector in the CL57T is a serial RS232 port. If your computer does not have a serial port (most likely), you can use the USB to RJ11 adapter. Make sure you have...
  3. Re: Rotary Vane Vac pump, sudden odd noise

    You are lucky that the vanes only got chipped. They usually shatter into unusable shards when they break - although that probably applies more to larger pumps where the vanes are wider and much...
  4. Re: Rotary Vane Vac pump, sudden odd noise

    a) vanes break when they are worn beyond the limit (not your case though);
    b) vanes break when a foreign particle finds its way into the cylinder (check the air filter);
    c) vanes break when they...
  5. Re: PlasmaCam Design Edge not cutting the whole design errors

    Just a guess - are those holding tabs?
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    Re: collet sticking.

    That is strange. In the ER system, the nut pulls the collet out even if the collet is somehow stuck in the taper. Are you sure you are snapping the collet into the nut properly and not just screwing...
  7. Re: Backlash on a 3018 pro CNC. How to reduce it, so that circles are really circles?

    As others said, your problem is not backlash. It is the overall rigidity of the machine.

    As I can see from the photos, the machine uses T8 trapezoidal screws with brass nuts. While not perfect,...
  8. Re: Proximity Sensors with MX4660 and Mach3, want some troubleshooting help

    The pulldown resistor activates the input - just like a closed switch would. The PNP switch, when triggered, "fights" that resistor and pulls the input up. This is not really a good technique,...
  9. Re: Proximity Sensors with MX4660 and Mach3, want some troubleshooting help

    I wondered why you bought PNP sensors. Most CNC board inputs are designed to work with NPN open collector devices. Also, it is customary to use NC for limit switches and stop buttons - so the...
  10. Re: Proximity Sensors with MX4660 and Mach3, want some troubleshooting help

    Those Chinese sensors are pretty reliable. They don't usually go bad unless you do something to kill them (like shorting the output).

    Does the red LED on the sensor light up when you put a piece...
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    Re: CamBam Arcs for Grbl?

    One common problem with G-code arcs is the incremental/absolute mode. Make sure the arc center mode is set the same in GRBL settings and in CamBam postprocessor settings.
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    Re: BLDC driver using STM32F103

    Are you sure you have steady HI level on those pins (not high frequency PWM)? Did you check it with a scope or just a voltmeter?
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    Re: Overcurrent Protection

    There should be a thermal overload relay between the contactor and the motor. The relay should be selected and adjusted for the nominal current of the motor.
    ...
  14. Re: Before I bin my whole control box...

    P. S. Some stepper drives have "decimal" microstepping options (1:5, 1:10, 1:20...). That would work nice for a "decimal" (5mm, 10mm...) ballscrew.
  15. Re: Before I bin my whole control box...

    1/320 is 0.003125, so you cannot avoid seeing some rounding artifacts when you squeeze 6 digits into a 4-digit DRO. My machine has 200 steps per mm (0.005 mm per step), so I never see that problem...
  16. Re: 0.55mm Kyocera Endmill breaking instantly

    It is not enough to simply "flatten" the PCB. No matter how you mount it, the height variations will still be enough to spoil the traces and/or break the bit.

    You need some way to ensure the...
  17. Re: Servo operates fine with zero load

    There are faults between "fully working" and "won't work at all". A motor with one bad winding or a short to ground may still pretend to work at low RPMs or without a load. Checking the windings is...
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    Re: Sunfar e300 wiring?

    O2 -> X1
    O3 -> X2
    24V0 -> CM
    AO1 -> AI
    5V0 -> CM

    Your inverter uses the same CM pin for Analog Common (referred to as "AC" in the AXBB manual) and Digital Common ("SC"). Some inverters have...
  19. Re: Servo operates fine with zero load

    Do you have a multimeter? Check the windings (all 3 windings should have an equal low resistance) and the insulation between the windings and the motor case (should be infinite resistance / open...
  20. Re: Mach3-How to Calibrate a Rotary Axis ?

    You know how many teeth your gears and pulleys have. You know how many microsteps per turn your motor has. Just calculate the "step per" value, there is no need to "calibrate" anything. A full circle...
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    Re: Blown UB1

    It's SMCJ24A, a 24V unidirectional TVS diode.

    https://www.diodes.com/assets/Datasheets/ds19003.pdf
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    Re: VFD wiring problem

    No, do not connect the power ground wire to that pin. There should be a separate terminal or screw for that. Can you post a picture of the entire VFD with all the terminals?
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    Re: VFD wiring problem

    The pin labeled "GND" seems to serve as ACM and DCM in your VFD. I guess its designers did not quite understand the difference between the terms "common" and "ground".
  24. Re: Slow with proximity switches, stop with limit switches?

    I think you are overthinking things. Bumping against a hard stop should not do any damage to the machine, and it only happens in rare circumstances (usually as a result of a tool crash or a hardware...
  25. Re: Slow with proximity switches, stop with limit switches?

    Just a small round rubber bumper serves as a hard stop for the X axis on this SCM router:

    https://i.ibb.co/mGt5CDN/2020-12-03-17-04-51.jpg
    https://i.ibb.co/GRctsV3/2020-12-03-17-05-16.jpg
  26. Re: Slow with proximity switches, stop with limit switches?

    All the routers I have seen only had one set of limit switches. If something malfunctions and the machine flies past the limit switch at high speed, it hits the hard stop without destroying itself.
  27. Re: BL-USBMach3 controller board Index issue, not work, random RPM value

    What kind of tachometer do you have on your spindle? What kind of output does it have?
  28. Re: GENERAL LIMIT SWITCHE FILTER FOR NOISY MACHINES WITH OUT RE-WIRING

    That's a very cool thing to build for your kid. I remember how my dad made me a simple lab power supply when I was 6 or 7 - so I could play with small motors, lightbulbs and switches. Having a...
  29. Re: GENERAL LIMIT SWITCHE FILTER FOR NOISY MACHINES WITH OUT RE-WIRING

    Even if we ignore the Arduino, we still have:

    - Low voltage logic over long wires.
    - NO switches.
    - A "filter" that is not really a filter, as philba noted.

    Bad engineering all around,...
  30. Re: Current Transformer to Analog input?

    Yes, this diode should work well.

    Tom's code calculates the RMS (root mean square) value of the input voltage. The first line is a simple averaging algorithm.
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