Need HELP on LAVA CNC 500

Discussion in 'CNC Machines' started by Bruce Ng., Apr 4, 2018.

  1. DMC

    DMC Scott Hudson

    So, what happened Bruce?

    You got it fixed?
  2. DMC

    DMC Scott Hudson

    Well, Bruce must have been abducted by Aliens and now on his way to another Galaxy.

    I email Bruce Two days ago and no reply.

    Good Luck Bruce, where ever you are?
    Can I have your CNC 500? :D

    where is Bruce.jpg
    Bruce Ng. likes this.
  3. v450

    v450 Active Member

    Bruce works in the building next door to me - I might get on my ghostbusters outfit and search for him
    cadfan and DMC like this.
  4. v450

    v450 Active Member

    If found Bruce and his error messages
    It seems like it’s overload followed by overheat on the spindle
    The LTI motion drive has error message indicating this
    Spindle is free spinning. Can we test the spindle somehow without removing? Is there a resistance across windings or something we can check?
    Y axis is fine, moves okay so brake is okay.
    DMC likes this.
  5. DMC

    DMC Scott Hudson

    In USA we have many lava mills that we add a resistor to the circuit for temp sensor in the spindle. I think more than half my mills we added one resistor across both wires going to the spindle internal thermistor.

    It is easy and fast. The LUST spindle controller is too sensitive with this.

    Go get that dude and tell him to come back here so he can get some good help! We didnt finish fixing
    Bruce Ng. likes this.
  6. DMC

    DMC Scott Hudson

    If not using the pink chiller fluid then corrosion will happen in a Festo fitting near the spindle and reduce flow.

    But 99% of the time the spindle is not actually overheated!
    Bruce Ng., v450 and cadfan like this.
  7. DMC

    DMC Scott Hudson

    The beckhoff controller has it's own temp sensor for the coolant. But this temp sensor almost never gets out of range. It always the LUST controller and the internal Fischer precise spindle thermistor that gets wonky. That sensor is embedded in the top section of spindle and glued in with the coils. Not actually in the coolant area but rather the top electrical part of spindle. Super common problem!

    Tell Bruce to throw a 2.2 ohm resistor across the two wires for the spindle thermistor circuit.

    I am traveling. But these two wires terminate to a little baby circuit board the size of a fat finger. This board had a round brown fuse 1cm diameter usually this board plugs into a primacon larger board
    Bruce Ng., v450 and cadfan like this.
  8. v450

    v450 Active Member

    Wow, you made short work of that! I’ll go find some red red (gold?) resistor and take to him !
    I think this will help. Glad to hear it’s a common problem, makes it more likely to be fixed ;-)
    Safe travels mate!
  9. DMC

    DMC Scott Hudson

    One of my mills we had to add two of these resistors. But the way.....same resistor will simulate an air bag in most all cars.
  10. Bruce Ng.

    Bruce Ng. New Member

    Hi Scott sorry for not getting back to you after a while, it was a very busy time before the end of financial year in Australia so I had to leave that issue behind and move on with the others. Thank God that I have Chris who is quite knowledgeable about CNC machine and he helped me check up. I will get back to it to it today.

    Again sorry for not getting back to you.
  11. v450

    v450 Active Member

    Thanks Scott, do you like Primacon because you love Primus or the other way around?

    With the 2.2 resistor, are you saying put in line with PTC, parallel with, or swap sensor for resistor?
    I’m interpreting it as a swap (ie removing the PTC leads and substituting for the resistor )
    Bruce Ng. likes this.
  12. DMC

    DMC Scott Hudson

    This is a cnc 500 and the tiny board that get the resistor.....

    Very top of mill.....Left side.

    20180710_075603.jpg 20180710_075613.jpg
    Last edited: Jul 10, 2018 at 10:06 AM
  13. DMC

    DMC Scott Hudson

    This is Lava Form that required two resistors....same thing. Same spindle. 20180710_075633.jpg
  14. DMC

    DMC Scott Hudson

    Experiment with putting resistor in-line with One wire like pic above.

    Also you could try to bridge the Two wires if that does not work.

    Or Try Two resistors.

    The mill above is only happy with Two resistors as in pic.

    All my other mills we use One resistor.

    v450 and cadfan like this.

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