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  1. #191
    Oh, and another thing.
    It is not an issue the alignment of material on the cnc spoilboard, when you run a profiling cut at the end, and throw away the remaining wood, but how about when a client comes to you with a finished piece of wood, and he want a 3mm edge all around the work. Gave this example as it is extremly visible a missalignment of this nature. How do you approach this?

  2. #192
    This last 2 questions are secondary to what happened today. While I was doing a job in 2 cuts, a roughing and a fininshing cut, on both of them, in one or two points, the z axis decided to go upwards and cut in thin air.
    This was about 5mm or more in the air. Like it was cutting for 2-3 hours without a problem and then sudently, raise the z axis 3-5 mm above and continue cutting.
    I could say to the client: it is cubism, but he.ll not buy it as it looks very weird.
    I managed to fix it by rewinding the g code, , restart from an approximate gcode line, rezero the z axis and continue cutting, but that.s no fix.

    Any ideas, or links that detail this or a similar problem?

  3. #193
    There is a possibility of a broken wire or loose connection. You should check the DIR pulse connections, but it is more likely that you have a break in one of the connecting wires to the Z motor. This is what I had.
    Albert Einstein may have been a genius, but his brother Frank, was a monster

    Having just moved to Windows 10 (which is crap) My stress levels are through the roof !!!

  4. #194
    Hi Rob.
    I.ll check that. Thank you.
    Today at the end of a job, during the profiling toolpath, the limit switches kept triggering. I assume because they are very cheap lever type switches and don.t go well with dust and vibration.
    I.m considering replacing all of them with someting better, especially for homing, as aparently I got a couple of milimeters of error today, as the lever got bent more and more.
    Any recommendations?

  5. #195
    Today at the end of a job, during the profiling toolpath, the limit switches kept triggering. I assume because they are very cheap lever type switches and don.t go well with dust and vibration.
    Or noise as in emf getting in to the system
    ..Clive
    The more you know, The better you know, How little you know

  6. #196
    I use inductive proximity sensors for home switching, but a micro-switch for limit like this
    Click image for larger version. 

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    The inductive sensor triggers off the aluminium of the gantry, but the micro-switch is tripped by a plastic wedge, which allows me to adjust the trip point.Click image for larger version. 

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    Separate pictures as I can not move the gantry at the moment as I am installing a new mains switch panel for the computers and CNC.

    There is one lesson I learned early on - do not have the proximity switch triggered by movement axially toward the switch, once you crush the end it is f***ed (rendered inoperative permanently), make the movement across the face of the switch. If you mount the switch on the gantry, you will only need one switch to sense at both ends of travel, by putting metal targets (preferably ferrous) at the appropriate places.
    Last edited by cropwell; 1 Week Ago at 01:02 AM.
    Albert Einstein may have been a genius, but his brother Frank, was a monster

    Having just moved to Windows 10 (which is crap) My stress levels are through the roof !!!

  7. #197
    It was an apx 5 hour cut. The switches went mad only in the last 10 min profiling cut. In fact I could not finish it, so I cut the work on the tablesaw.
    I assume a noise issue would be persistent all the time, but who knows. I was lucky I was watching it and had pressed the estop quickly, as after a trigger, pressing reset, restarting the spindle and pressing cycle start (which in this case should continue the cut from where it stopped), well, after that, the cutter went straight through the work in a perpendicular direction, no idea where it was planning to go, messing up fortunately, only 3mm on one edge, which I managed to sand and fix.
    I.ll do on monday some experiments, to see if it was just for that cut, or was just the starting point of triggers, check the connections and all.
    It very well may be noise, but at this moment, my personal opinion is that the limits used as homing, due to the rough contact with the metal components and dust, malfunctioned. The levers are already bent, and I did get some differennt homing refferences. Might be a a loose connection, as Rob said, which causes some noise and all kind of trouble. MIght be somthing else. Who knows.
    Anyway, any recommendation about homing switches types?

  8. #198
    *once you crush the end it is f***ed (rendered inoperative permanently)* - the switch or the cnc?

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