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  1. #1
    Registered
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    Dec 2009
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    451

    Was This An Anomaly?

    This morning I powered up my 770 to cut some flutes in a couple of reamers I've been working on.

    Shortly after powering up I heard a sharp squeal coming from the area of the cooling fan. I thought maybe the
    bearings in that little fan had just taken a crap on me.

    It stop squealing as quickly as it had begun and everything appeared to work normally after that.

    As I proceeded to index my part on the 4th-Axis, I noticed that the on-screen jog button (to switch from "Continuous" to "Steps")
    wouldn't work. The little yellow light worked when I switched from one setting to the other but, the table wouldn't move in either setting.

    I had to press the "Reset" button to get the table to move again.

    I generally use the the on-screen Job-Button and Arrow-Keys to help me index my part and zero my Axis'. I can do it without using the Jog-Button but it's frustrating to find that something may be wrong somewhere in the electronics where I know the least about trouble-shooting. I've owned it over a year so I don't think it's still under warranty.

    After I'd done all the milling I was going to do I re-checked the on-screen Jog-Button. It appeared to be working again; in both settings.

    When I was done milling the flutes I shut down the mill and checked all the electrical wiring for any tell-tale burn marks or anything out of the ordinary. I didn't smell anything burning that would indicate a short or arching of any kind.

    Can one of you guys give me a clue where to start looking for anything that might induce such an event? It will be at least another week till I'll need to use my mill again. I thought in the mean time I could do a little research on the possible causes of a malfunctioning Jog-Button.

    Any help you can give me will be appreciated.

    MetalShavings

  2. #2
    Registered
    Join Date
    Nov 2005
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    135
    Can't help with the other stuff, but on my 1100 the cabinet cooling fan started doing that around 2 months ago when it starts up for the 1st time, and does it half the time it switches on now.
    If I power off (e-stop) tap the fan a bit then switch back on, it stops. Don't actually have that many hours on the Mill yet, probably only around 100 or so, but it was sitting in storage for 9-10 months before it was installed.
    I suspect the bearings are on their way out and will probably need to put a new fan in

  3. #3
    Gold Member
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    Feb 2006
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    7087
    There is nothing in the hardware that could possibly affect the jog controls. That was just a software hiccup.

    Regards,
    Ray L.

  4. #4
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    Dec 2009
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    451
    Good to hear I'm not the only one that experienced cooling fan noise and good to hear that it may just be a "hiccup."

    I guess I'll find out the next time I power up if this is really going to be an issue or not. Generally there's someone on
    this forum who's experienced some form of anomaly or symptoms on their mills that might be able to clue me in.

    I'm just glad it doesn't sound like a major concern. Thanks guys.

    MetalShavings

  5. #5
    Gold Member
    Join Date
    Jun 2004
    Posts
    6618
    I know that when I am starting Mach, I sometimes get a Windows nag screen telling me the computer may be at risk. No antivirus software installed.
    Jogging will not work with the keyboard after I close that screen out. I have to actually click back anywhere on the screen to get Mach back even though it looks like it is front and center.
    Clicking on the jog toggle button would have resolved that though, so may not be what you saw.
    Lee

  6. #6
    Registered
    Join Date
    Feb 2008
    Posts
    389
    +1 on what Ray said
    The fan on my machine started growling and eventually stopped spinning, Tormach replaced it under warranty.
    Gerry
    Currently using SC7 Build 1.6 Rev. 64105

  7. #7
    Gold Member
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    Sep 2012
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    1543
    Did you hit a limit switch? If so that is why you had to hit reset before you could jog again.

  8. #8
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    Quote Originally Posted by BAMCNC.COM View Post
    Did you hit a limit switch? If so that is why you had to hit reset before you could jog again.

    At the time it happened, this was my first thought because, when I first took delivery of the machine I did have an issue with the X-axis limit switch.
    (tormach replaced it under warranty)

    Whenever those initial limit-switch symptoms occurred, the reset button would flash, indicating that I had to hit the reset button because the table would no longer jog/move.


    When this present on-screen jog-button symptom occurred, the reset button didn't flash. I just clicked on it because that's what I used to do before.

    I'm hoping it's a non-issue now but, have you ever noticed that things start going south no sooner than your warranty expires? I hate it when that happens.

    HollowPoint

  9. #9
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    Sep 2012
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    1543
    Keep an eye on your red/green ref lights on the right side of your dro's, always want them green.

  10. #10
    Plastic
    Join Date
    Apr 2013
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    0
    But hey thanx for posting!!!



  11. #11
    Several years ago I had an issue with the X & Y axis limit switches vulnerability to flood coolant. Sometimes after exposure to coolant the limit switches would become intermittent. The fix was seal the Y-axis limit switch cover and the gap in the front SS shield over the x-axis with noncorrosive type II Silicone RTV.

    Don Clement

  12. #12
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    Dec 2009
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    451
    Quote Originally Posted by BAMCNC.COM View Post
    Keep an eye on your red/green ref lights on the right side of your dro's, always want them green.
    This was the crazy thing about the symptom in question. Nothing on the screen was out of the ordinary. All the correct lights were on that needed to be on and off where they needed to be off.

    With the X-Axis limit switch issues I mentioned before. The DRO lights would switch back to RED when that problem occurred but, Not with the present symptom.

    Before I got that initial X-Axis limit switch problem resolved, I could go the screen that shows the status of the switches and such and it would indicate that something had indeed gone amuck with the switch. With this present On-Screen Jog-Button snafu there was no such indication. The Jog-Button just wouldn't work.

    MetalShavings

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