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Thread: Lagun FTV3

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  1. #1

    Join Date
    Oct 2019
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    19

    Smile Lagun FTV3

    Well......Picked up a Lagunmatic 310 knee mill and figured Id give CNC milling a try. Ive gotten pretty far with the help of others. Probably should have started a build thread here, but Ill just start with saying Im a newbie with 0 experience in anything related to anything about to CNC machining. lol.
    Pulled most everything out of the control box and installed a Kflop/Kanalog. I have just one axis servo driver plugged in at the moment. I thought just getting the motor to talk to the computer and the computer to talk to the motor was going to be difficult but Ive ran into another wall that makes my head hurt with servo tuning. Still a lot to do but the current hurdle is servo tuning. Dont really understand much here, but playing and poking around kmotion for the24hrs. I feel like Ive made a little progress. When I first turned the power on the servo motor was just doing its own thing. Ive got it making one rotation and back to 0 with the step response screen. Pretty exiting, goes back to 0 everytime . Im probably far from it being ok, but maybe someone could tell me a little more about what Im doing here and what I should be doing.
    This servo motor has a 2000 count encoder.

    Probably a different problem for later,but the belt drive is 1:1 and 1 revolution moves the table .200. No idea where to input table travel in relation to servo revolutions

    Heres a screen shot of how far Ive gotten.
    Thanks in advance

  2. #2
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    May 2006
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    Re: Lagun FTV3

    Hi JeepGuy,

    That looks like a good start with only P again.

    Have you read our Servo Tuning Overview in our wiki?
    TK
    http://dynomotion.com

  3. #3

    Join Date
    Oct 2019
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    19

    Re: Lagun FTV3

    Hi Tom!
    Thanks for the reply. I have read the servo tuning guide, a couple times.
    I read through alot of your posts and through the Tree build. I feel really bad about asking for help, Im sure your tired of explaining this to people who dont understand. lol. Im in way over my head sorta speak. Watched some youtube of guys with stepper motors and benchtop cncmills and how they installed them, I was like that looks easy enough. Somehow I ened up with a cnc kneemill, with servomotors. Slightly more complex. Thats how I got myself into this. Overall its been fun learning about a world I know nothing about.

    Im not sure if I have velocity or torque amplifers. They are Servo Dynamics 1525
    Im guessing velocity. As I got some results with only P gain.
    Dont understand the filters, but maybe not applicable to my application?
    After reading the Tuning overview again I see table movement is in toolsetup screen. I have yet to explore that area yet. Ill save that for later.

  4. #4
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    May 2012
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    438

    Re: Lagun FTV3

    Quote Originally Posted by jeepguy88 View Post
    Watched some youtube of guys with stepper motors and benchtop cncmills and how they installed them, I was like that looks easy enough. Somehow I ened up with a cnc kneemill, with servomotors. Slightly more complex.
    You made the right decision. Those guys might be up and running now, but your machine will be in a whole other class when you get it running.

    May take a little more time and money now, but no amount of time and money in upgrades will ever make a stepper driven benchtop machine come close to a knee mill with servos. Just be patient and you will have a much better machine in the end.

  5. #5
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    Re: Lagun FTV3

    Hi JeepGuy,

    Did you understand and do Step #3 and determine the maximum P gain that was stable?
    TK
    http://dynomotion.com

  6. #6

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    Oct 2019
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    Re: Lagun FTV3

    Quote Originally Posted by TomKerekes View Post
    Hi JeepGuy,

    Did you understand and do Step #3 and determine the maximum P gain that was stable?
    Understand....Yes? The maximum speed for my servo that the system can handle translating and applying output to the servo?
    At a P gain of 2.8 or maybe it was 3, the servo motor wigs out and I get a voltage fault on the servo driver and have to reset.

  7. #7
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    Re: Lagun FTV3

    Hi JeepGuy,

    It isn’t entirely clear that an unstable servo caused the “wig out” and not just more aggressive motion and corrections. I will assume it was.

    Servo instability is like an inexperienced driver that makes over corrections that results in ever increasing weaving until a crash.

    Now that the errors are below a few hundred counts you might set the Max Following Error to something like 1000 so that any instability will quickly cause a disable rather than a crash or amplifier fault.

    Please now do Step 4
    TK
    http://dynomotion.com

  8. #8

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    Oct 2019
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    Re: Lagun FTV3

    Not sure what a max unstable D gain looks like.

    Poking around, not sure what I did, but now when I hit the move button in Set response it seems to disable the servo now. I dont think it was the max following error, but put that back to where it was,didnt seem to help. Thought I put everything back to where it was earlier this morning and still nothing

  9. #9

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    Oct 2019
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    19

    Re: Lagun FTV3

    How silly of me, somehow the positve watch limit box got checked. Wasnt me. lol

    Ok back to work.
    Im guessing Im looking at the plot graph for D gain. I added 1. Increased P gain slightly. Any mount of I gain seems to be unstable,

    I thought I read that you like to see .png images, when I upload them as png it turns it to .jpg

  10. #10
    Junior Member
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    Re: Lagun FTV3

    Hi JeepGuy,

    Your image is difficult to read. You should be able to save as and upload *.png files.

    You didn't include the IIR Filters Screen. Please add a 2nd order low pass filter as described in the Step #4 Link.

    D Gain values typically need to be 10~100X the P Gain value to have an effect. A value of 1 probably had an insignificant effect. Did you search for the maximum D Gain that is stable?
    TK
    http://dynomotion.com

  11. #11

    Join Date
    Oct 2019
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    19

    Re: Lagun FTV3

    Am I suppose to be watching for something on the plot graph while adding D gain or just finding a maximum like P?

    Had a minor set back yesterday. I accidentally shorted my 5v supply. Ive got 5v's back with a new supply, however Im currently having trouble connecting to the Kflop and I have a green led light on the kanalog board that was not on before. My computer does not recognize the usb input from kflop at the moment.Cant find the kmotion usb in devices.

  12. #12
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    Re: Lagun FTV3

    Hi JeepGuy,

    Am I suppose to be watching for something on the plot graph while adding D gain or just finding a maximum like P?
    Find maximum similar as P. Increasing D should cause the system to be slower and more stable up to a point then less stable. Proper D gain should allow higher P gain and result in less following error.

    Had a minor set back yesterday. I accidentally shorted my 5v supply. Ive got 5v's back with a new supply, however Im currently having trouble connecting to the Kflop and I have a green led light on the kanalog board that was not on before. My computer does not recognize the usb input from kflop at the moment.Cant find the kmotion usb in devices.
    That doesn’t sound good. Disconnect everything from KFLOP except +5V power and only connect the USB to the PC. If it doesn’t show as a Device in Window’s Device Manager then KFLOP’s USB is likely damaged.
    TK
    http://dynomotion.com

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