Add frame detection


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  1. #1
    Member ubergeekseven's Avatar
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    Default Add frame detection

    Has anyone added a way to emergency stop the job if the machine crashes and then touches the frame? It does not seem like it would be hard to do, maybe link it to the estop itself? I have , 2 times, had a communication error before switching to a newer computer, and it bit a part of my frame. Luckily not bad. But if I could add this, then it could reduce the chances of something terrible happening in a couple seconds if it happens again.

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    Default Re: Add frame detection

    They are called limit switches.

    Gerry

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    Member ubergeekseven's Avatar
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    Default Re: Add frame detection

    Quote Originally Posted by ger21 View Post
    They are called limit switches.
    Yeah, I have limit switches. I've had ess errors before that make the Gantry move in an unpredictable way, and it doesn't broadcast the problem until it's happening. The e-stop still works, so I thought that if the bit hitting any part of the frame could trigger that same response, it would be more reliable than me running to hit the e-stop.

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    Default Re: Add frame detection

    Are you saying the limit switches aren't working?

    Gerry

    UCCNC 2017 Screenset
    [URL]http://www.thecncwoodworker.com/2017.html[/URL]

    Mach3 2010 Screenset
    [URL]http://www.thecncwoodworker.com/2010.html[/URL]

    JointCAM - CNC Dovetails & Box Joints
    [URL]http://www.g-forcecnc.com/jointcam.html[/URL]

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


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    Member ubergeekseven's Avatar
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    Default Re: Add frame detection

    They are working fine. I had an issue with my ess with an older laptop that would send the cutter into the spoilboard and then keep moving. I have resolved the issue with a new computer.
    When it buried the bit, it hit the frame of the machine. I was thinking that I could wire the frame so that if the bit ever did hit the frame, it would act as a limit switch and stop movement sooner than I could hit the e-stop.

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    Member ger21's Avatar
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    Default Re: Add frame detection

    You could add a bottom Z limit switch to prevent it, but that can be problematic, depending on tool length.
    You can use the Z inhibit feature in Mach3 to prevent the tool from going down to far, but that probably wouldn't have helped in this case.

    Other than that, I don't know what else you can do, unless your entire machine was one big circuit, with the spindle isolated from the frame. But I think that approach would be problematic at best.

    Gerry

    UCCNC 2017 Screenset
    [URL]http://www.thecncwoodworker.com/2017.html[/URL]

    Mach3 2010 Screenset
    [URL]http://www.thecncwoodworker.com/2010.html[/URL]

    JointCAM - CNC Dovetails & Box Joints
    [URL]http://www.g-forcecnc.com/jointcam.html[/URL]

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


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    Member ubergeekseven's Avatar
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    Default Re: Add frame detection

    Right before reading this, I must have woke up. I thought about it and realized that the frame is not isolated from the spindle. At least not all of the time. It isn't reliably isolated. It would definitely trigger at random times.

    Thanks for the replies anyway. I haven't had this issue since the upgrade. But I'm paranoid whenever I'm using it since it did happen. I'll just stay paranoid until I know it's not going to happen.

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    Default Re: Add frame detection

    What about a limit switch that is connected to a relay that would kill power to the whole thing? A small mechanical limit switch could be mounted such that it would only be triggered when the motor was way low? This would be an external circuit to the machine I'm thinking. Something like a PowerSwitch Tail might work. Just thinking out loud here.

    Tony



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    Member ubergeekseven's Avatar
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    Default Re: Add frame detection

    Quote Originally Posted by Goonk View Post
    What about a limit switch that is connected to a relay that would kill power to the whole thing? A small mechanical limit switch could be mounted such that it would only be triggered when the motor was way low? This would be an external circuit to the machine I'm thinking. Something like a PowerSwitch Tail might work. Just thinking out loud here.

    Tony
    That's not a bad idea. I would have to reset the job anyway. I could add it to the z axis and make it vertically adjustable depending on the tooling at the time.

    Sent from my SM-N950U using Tapatalk



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