TB6600 drive from EBAY - Page 4


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  1. #37
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    Lucas, what do you think about shorting pins 3&4 to keep it at 100%?

    I have my x and y axes on my 6040Z running these drivers as the ones supplied were missing steps, but whilst I connected the stepper drivers and empirically found the correct DIP switch settings for 1/8 microstep a few months ago, I have not had time to do any milling since except to test axis movement unloaded. Reading your info and examining my boards I suspect I will not be running full current to my steppers and wish to do so.



  2. #38
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    It should work and it's also very easy to implement.
    Just watch the motor temperature as it will rise during standby.

    It's obvious that you can read a schematic, do you have an explanation for the purpose of the transistor/resistor combo between the Enable and TQ pins?

    Open source CNC electronics and accessories:
    http://users.skynet.be/ldt/CNC%20electronics/THB6064AH.html


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    Thanks Lucas.

    It is mystifying to me. Seems unnecessary duplication/pointless.

    If China do really work on Quality Control and feedback/testing to correct mistakes and improve reputation instead of just the partial refund, they will step more on the toes of the West, but for now, the West has a few aces left? The time these corrections/investigations take is far more valuable than the cost of the drivers to each Western buyer that has to correct the mistakes. I wonder when this will really sink in?



  4. #40
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    I love the THB6064AH series of drivers from massmind that lucas designed.
    No stalls, no resonance, and no issues. They just work very well without effort.



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    I am glad I found this thread, I have the same problematic drives in my mill setup.
    Do I understand it correctly looking into TB6600 schematics, pin 3 TQ should be connected to pin 4 Latch/Auto.

    Which components are incorrect/wrong values? Are they Vref resistors? Could I change them to improve performance?

    Thanks a lot for your help.



  6. #42
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    A surface mount resistor and capacitor on the back of the board (where there isn't much room) are orders of magnitude too small.

    I'm intending to put a blob of solder between pins 3 and 4 to try. I'm experienced with soldering short of replacing SMT components, and I don't even know if a capacitor of sufficient capacitor would be a same size replacement whilst not using such a high resistor value that it would take too long to charge and produce a delay with each step signal.



  7. #43
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    I just noticed this thread. About 6 months ago, I also tried one of those HY-DIV268N-5A TB6600s and also found the torque was really low. Now I know why -- thanks Lucas!!
    I tried 3 different Chinese 6600 boards and all had oddities of some sort. What I don't get is why a Chinese company hasn't hired Lucas to design a proper 6600 board for mass production.

    David Malicky


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    Lucas,

    If you would like, please PM me. I'd like to send you for free our very latest new drive; I think you will find it interesting.

    Mariss
    Geckodrive



  9. #45
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    Quote Originally Posted by kizier View Post
    I am glad I found this thread, I have the same problematic drives in my mill setup.
    Do I understand it correctly looking into TB6600 schematics, pin 3 TQ should be connected to pin 4 Latch/Auto.

    Which components are incorrect/wrong values? Are they Vref resistors? Could I change them to improve performance?

    Thanks a lot for your help.
    Pin 3 must be at high level to drive the chip in full current mode, you could try to lift it and connect to +5 through a 4K7 - 10K resistor.
    Pin 4 already has this resistor, so shorting 3 to 4 should do the job.
    A lot of components are wrong in this drive, the whole torque control is wrong and there are others like the 470µF cap on the Vreg output, the datasheet says 100n.
    I wouldn't be surprised that a capacitor wich is 4700 times to high might kill the internal 5V regulator.
    A "How to fix this drive" won't be as easy like it has been done for the crappy Chinese TB6560 drives.

    Quote Originally Posted by dmalicky View Post
    I just noticed this thread. About 6 months ago, I also tried one of those HY-DIV268N-5A TB6600s and also found the torque was really low. Now I know why -- thanks Lucas!!
    I tried 3 different Chinese 6600 boards and all had oddities of some sort. What I don't get is why a Chinese company hasn't hired Lucas to design a proper 6600 board for mass production.
    I remember your thread on 2 drives but this one wasn't mentioned if memory serves me well?

    Designing a decent drive with these Toshina chips isn't that difficult, a lot of people here can and have done it.
    The THB6064 is an easy one, it has more features and all the 'difficult stuff" is built in, the TB6600 lacks a few of these and makes it more complex to design a well performing drive.
    Even then the TB6600 can't match the THB6064: less microstep and decay mode options.

    Designing a drive is one thing, make it so that it will last long is another: choosing the right components for the job, proper PCB and mechanical design etc..
    This is where my 30+ years of repair experience helps a lot, I learned from the mistakes made by others....

    Quote Originally Posted by Mariss Freimanis View Post
    Lucas,

    If you would like, please PM me. I'd like to send you for free our very latest new drive; I think you will find it interesting.

    Mariss
    Geckodrive
    Sure I will find it interesting, I already have some G251's.
    And I also build the CPLD drive from your thread here and implemented morphing and mixed decay on it.

    These Toshiba chip drives are basic and can't stand a comparison with Gecko's but I might take your offer to see how well these new drives perform.

    Open source CNC electronics and accessories:
    http://users.skynet.be/ldt/CNC%20electronics/THB6064AH.html


  10. #46
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    Lucas and jcsbanks, thanks for your replies. I tried with connecting pin 3 and 4 as indicated, but my stepper is getting really hot, as mentioned by lucas, slight increase in torque noticed (not measured quantitatively though). I am starting to save for proper drivers or will construct something based on proven design.

    Thanks again. All the best. kizier



  11. #47
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    Thanks for the feedback, I've not had chance to connect pins 3-4 yet. How long did it take the stepper to get hot and was it too hot to hold? Is the thought that when moving the stepper will effectively cool itself due to windage or is it just as hot as it would be when operating?

    Wondering if the current settings are correct, I'll look at some calculations based on the component values when I get chance unless someone else already has.

    Lucas, when you say the whole torque control is wrong, you mean the components attached to pin 3 that we've already discussed or are there other problems?



  12. #48
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    Quote Originally Posted by lucas View Post
    I remember your thread on 2 drives but this one wasn't mentioned if memory serves me well?

    Designing a decent drive with these Toshina chips isn't that difficult, a lot of people here can and have done it.
    The THB6064 is an easy one, it has more features and all the 'difficult stuff" is built in, the TB6600 lacks a few of these and makes it more complex to design a well performing drive.
    Even then the TB6600 can't match the THB6064: less microstep and decay mode options.
    Good memory! Yes, I saw the new one after trying the other 2.
    I'd be happy with a good presoldered THB6064, too. That's interesting that it's easier to design around. The 5.0 amps of the TB6600 is helpful for a few apps, but for others it sounds like the THB6064 is a better choice.

    David Malicky


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