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IndustryArena Forum > MetalWorking Machines > Bridgeport Machines > Bridgeport / Hardinge Mills > Series 1 BOSS 5 X Axis Dead, still dead after new transistors
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  1. #1
    keebler303 Guest

    Series 1 BOSS 5 X Axis Dead, still dead after new transistors

    I accidentally fed my 2" face mill into some HRS at 60" per minute. My X axis stopped dead in it's tracks as soon as the face mill hit the stock. I tried jogging and it did the jumpy vibration thing like an output transistor was blown. I shut down for the night. The next day, I checked the fuse for the X axis and it was blown (FU12). I replaced the fuse and tried again. Same problem. Then I measured x axis phase voltages at the control and noticed one leg (X4) was significantly different from the others and the known good Y axis motor. I traced X4 back to the lowest transistor on the X heatsink. I replaced only that transistor with a new 2N6547. This did not fix the problem. I then replaced the remaining 3 transistors and still not fixed. I tried swapping SMD boards and the problem stays on the X axis.

    By not replacing all 4 transistors at once could a remaining bad one blow the new one?
    What else is there that would give me the symptom of a blown transistor?

    What else can I check?

    Thanks
    Matt

  2. #2
    Join Date
    Feb 2006
    Posts
    30
    Matt, can you make a comment about your machine issue...did you fix it ?...as I have exactly the same condition with mine. (Series 2, ex Boss 6, Mach 3, BOB).
    Regards.
    Jerry

  3. #3
    Join Date
    Jan 2006
    Posts
    2985
    Jerry

    I replied to your PM. Long story short, I gave up and installed a Gecko G203V on the X axis only.

    Matt

  4. #4
    Join Date
    Feb 2006
    Posts
    30
    Hi Matt.
    Couldnt find your reply in my PM, anyway thanks for your help so far...
    Jerry

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