TB6600 drive from EBAY - Page 7


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Thread: TB6600 drive from EBAY

  1. #73
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    24" x 24" for PCB's only? That are large pcb's :-)
    I would suggest to visit the "PCB milling" forum here, you will probably find very usefull info there.
    Your setup is no problem, you can slave the 2 Y axis in software (Mach3 etc..) or connect the 2 drives to the same BOB output.
    There are some differences between my BOB-drive setup compared with the Massmind one. Take a look and decide which one suits you best.

    Lucas, I have been kicking this around for a long time and decided that it would be nice to not only mill PCB's but also aluminum (understand it will req light cuts). I read through a build on this forum and really love it, as its exactly what I envisioned. Cant remember the member, but it was a 24" x 24" one. As for the drivers etc, are you ones available from you ? Wasnt sure if I had to get them from MassMind, as the page kind of eludes to them being made by you FOR them.



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    Quote Originally Posted by stern-69 View Post
    As for the drivers etc, are you ones available from you ? Wasnt sure if I had to get them from MassMind, as the page kind of eludes to them being made by you FOR them.
    You did read that right:
    I made my own design with optocouplers and onboard 5V regulator, the version for James of MassMind was made by me according to their specifications.
    The 2 designs are different, it's up to you to decide wich one you need or prefer.

    Open source CNC electronics and accessories:
    http://home.scarlet.be/ldt006/THB6064AH.html


  3. #75
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    Ah, ok, didnt realize that. Well not knowing much about CNC (still learning) chances are I would go with your units, as you know your stuff and what it will do, and that makes me feel a lot more comfortable



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    Default Re: TB6600 drive from EBAY

    Thanks Lucas and every one for the great suggestions
    I have 3 of these drivers from China and I noticed the same behavior of weak torque (running nema 23 with power supply of 36 volts), then I checked the board and the TQ (pin 3 was always LOW - 0 volts)
    I connected the pin 3 and 4 to make TQ HIGH as you can see in the picture below
    TB6600 drive from EBAY-photo-jpg
    This mod made the motor stronger but I noticed that the 2 blue resistors (I measured them to be 1 ohm connected to pin 11 and 15 each) heat up a lot (I can't even touch them) so they will blow up if I run like this for long time.
    I made sure that my Vref is below 1.95 volts (by lowering down current limiting switches) but they still heat up (I think even while the drive is not running the stepper motor)

    My question is that are these blue resistors not powerful enough to handle this? should I replace them with something like 5W 1 ohm resistors? I guess I need to measure the voltage drop over them and calculate the power requirement for them since I don't know their current power rating.
    What else can I replace on the board to make this board survive? Lucas you mentioned something about replacing the capacitor that will blow up the voltage regulator, which one is it?



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    Default Re: TB6600 drive from EBAY

    Quote Originally Posted by cinek View Post
    This mod made the motor stronger but I noticed that the 2 blue resistors (I measured them to be 1 ohm connected to pin 11 and 15 each) heat up a lot (I can't even touch them) so they will blow up if I run like this for long time.
    I made sure that my Vref is below 1.95 volts (by lowering down current limiting switches) but they still heat up (I think even while the drive is not running the stepper motor)

    My question is that are these blue resistors not powerful enough to handle this? should I replace them with something like 5W 1 ohm resistors? I guess I need to measure the voltage drop over them and calculate the power requirement for them since I don't know their current power rating.
    When did you buy these? I can't understand that this isn't solved yet, hundreds of buyers must have complained...
    Suggestion: Complain to your buyer and you might get a partial refund :-)

    The resistors are 0.22 ohm, you can't measure these low values with a regular multimeter, a milliohm meter is needed for this.
    The drive is always at 100% torque with the change you applied, this indeed results in heat even when the drives are not spinning the motor.
    You should also notice heat from the chip or do you have active cooling (fan) on the heatsink?
    I don't know if the resistors will fail: I would need the datasheet but don't know the type or manufacturer.
    Changing the decay mode has an effect on the resistors heat but the TB6600 doesn't have this feature.
    I think they will survive if cooled, you could change them to a higher wattage type, it's recommended to use low inductance resistors and these are expensive.

    Quote Originally Posted by cinek View Post
    What else can I replace on the board to make this board survive? Lucas you mentioned something about replacing the capacitor that will blow up the voltage regulator, which one is it?
    There are 2 electrolytic capacitors on this drive which are questionable:
    - The biggest one (1000µF, 50V) marked on the PCB as 3300µF ... MUST be a low ESR type and it isn't, it will heat up and die.
    - There's a 470µF 25V on the 5V output from the chip, the datasheet says that this should be a decoupling capacitor, this is usually in the area of 100nF and a 10µF electrolytic in parallel.
    A capacitor with such a high value could destroy the chip due to the high inrush current on power up.

    Open source CNC electronics and accessories:
    http://home.scarlet.be/ldt006/THB6064AH.html


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    Default Re: TB6600 drive from EBAY

    Does anybody know anything about this driver? and how well it works?

    Sold here

    TB6600 Stepper Motor Driver Board 4.5A CNC engraving driver board
    and on ebay
    TB6600 Stepper Motor Driver Board 4 5A CNC Engraving Driver Board | eBay

    Thanks Daniel



  7. #79
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    Default Re: TB6600 drive from EBAY

    The heatsink is small and also on the bottom, so it will likely need a fan. But the other side of the chip is exposed, so a heatsink could be applied there, too.

    The connectors look identical to the Rattm version: http://i00.i.aliimg.com/img/pb/587/5...594587_317.jpg
    I tested one of those and found the connectors were loose enough to break the motor current, blowing the drive: http://www.cnczone.com/forums/steppe...l#post1233542S
    So, superglue them so they can't separate.

    I'm sure the cap is not a low-ESR, as Lucas has pointed out. That may be ok for low usage, but eventually it will die.

    It's currently the lowest priced version on the US ebay, and quality evidently reflects that. Which is not to say it won't work with some fixes. The design is unknown. Let us know if you test one.

    David Malicky


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    Default Re: TB6600 drive from EBAY

    Looks like the chip is glued to the heatsink (no screws) and I don't see any screws or other fixations between the heatsink and PCB.
    Would they really dare to sell a drive with the heatsink glued to the chip and this whole assembly hanging only on the tiny pins of the chip?
    Anyone who has handled a TB6600 chip will know that the pins are flimsy, no strenght at all.

    Am I missing something or is this really the case?
    I wouldn't even dare to use a construction like this for a prototype.

    Open source CNC electronics and accessories:
    http://home.scarlet.be/ldt006/THB6064AH.html


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    Default Re: TB6600 drive from EBAY

    Quote Originally Posted by lucas View Post
    Looks like the chip is glued to the heatsink (no screws) and I don't see any screws or other fixations between the heatsink and PCB.
    Would they really dare to sell a drive with the heatsink glued to the chip and this whole assembly hanging only on the tiny pins of the chip?
    Anyone who has handled a TB6600 chip will know that the pins are flimsy, no strenght at all.

    Am I missing something or is this really the case?
    I wouldn't even dare to use a construction like this for a prototype.
    Wow, I don't see any other heatsink support, either. That's a big cantilever torque for those little pins. Maybe there are a few dabs of epoxy that we can't see, but there's no evidence to assume so.
    Apparently, they do dare -- this is how many manufacturers hit a new low price point. Given the string of problems that we know of already, I'd expect there are more.

    David Malicky


  10. #82
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    Default Re: TB6600 drive from EBAY

    The heat sink is is taped on. It is normally intended for surface mounted chips.



  11. #83
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    Default Re: TB6600 drive from EBAY

    Hallo Lucas,

    i tryed to contact you because i want to buy a stepper driver kit from your homepage, but the mailserver sends the mail back to me (user unknown).
    Is the THB6064 project still alive?



  12. #84
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    Default Re: TB6600 drive from EBAY

    I can't receive private messages here on the zone for an unknow reason.

    Project isn't dead.

    PM sent to you.

    Open source CNC electronics and accessories:
    http://home.scarlet.be/ldt006/THB6064AH.html


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