1. #1
    It took a while, but we are getting there with our cybernetic CNC.
    See previous post
    http://www.mycncuk.com/threads/8223-...ght=cybernetic

    I wired up the TB6600 to a eBay Planet USB CNC clone from Ratim.(Not aware it was a cloned product when I bought it)
    The TB6600 drivers are connected on a 19-24 V power supply, now at 20V and at 1/8 microstepping.

    In the beginning the motors started grinding when driving to fast and the CNC carriage was easy to stop by hand.
    I got decent result and torque after I inverted the pulse on the USB CNC software.
    But the drivers get quite warm, around 40C/43C after 30 min. usage.
    Even when the CNC is doing noting, the drivers get warm.
    Arround 33C after 20 min. doing nothing.


    So I was wondering if it is normal for the Ebay TB 6600 steppers to get so warm, or was inverting the pulse not a good idea ?
    I had a look at a spare driver and there appeared to be thermal paste between the TB6600 and the heatsink.
    We can get the temp down with some fans of course.


    I also looked up the spec of the older drivers the the machine came with,
    L297 drivers.
    These drivers have Full/Half step mode, so can it be that 1/8 is to much for the motors and make the stepper driver to hot?
    I still have to check this.


    Kevin.

  2. #2
    Neale's Avatar
    Lives in Plymouth, United Kingdom. Last Activity: 10 Hours Ago Has been a member for 4-5 years. Has a total post count of 1,001. Received thanks 170 times, giving thanks to others 5 times.
    One thing to remember with stepper motors is that they are still taking current when stationary - this is to hold the motor in position. So the driver will still be working as well. However, a lot of drives switch to "half-current" mode when the motor is stationary so that reduces power consumption and heat dissipation a bit. However, 40C or so doesn't sound that hot to me. My motors get hotter than that in normal operation!

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  4. #3
    Thanks for your reply Neale.
    The temperature I mentioned was of the stepper drivers.
    The motors run around 35C
    You think 40C is still ok for the TB6600 drivers?

  5. #4
    Which are you asking about here.! . . . Hot drivers or Hot steppers. Because you mention both.?

    Steppers usually get hot, between 50-80deg is quit normal depending on factors like voltage and current. But drives getting hot isn't a good thing so I'd suggest some cooling to help ease there pain, esp has they are wimps to start with.!!

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  7. #5
    Sorry to be unclear and thanks for the reply jazzcnc, I was referring to hot drivers.
    I got them cooler and a bit more torque by un-ticking the invert pulse mode, and switch the DIP switches to 5 amp.
    Not as much torque as inverting the pulse, but the drivers are much cooler.
    I red on the following post that the Amps settings of these drivers are correct, and I'm probably save.
    http://forum.planet-cnc.com/viewtopic.php?f=9&t=1107

    I will do some tests next week to see if the machine has enough torque.If not, I will go back to inverting the pulse rate and ad some fans on the drivers.

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