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Type: Posts; User: kreutz

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  1. Replies
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    Re: X1 Micro-mill with Mardus-Kreutz Drives

    I haven't considered the use of ballscrews mainly because of the limited space between the table and the saddle on the x axis (about 20mm). I don't have access to a bigger machine to mill the saddle...
  2. Replies
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    Re: X1 Micro-mill with Mardus-Kreutz Drives

    Update after a few years of use.

    During all these years I had to replace the x and y leadscrew nuts four times. Every new nut requires a lot of adjustments to be performed which requires a long...
  3. Replies
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    Re: Hello, can you help me with HP UHU BOARD

    I am pretty sure he is still selling them...

    Regards,

    kreutz
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    Re: Hello, can you help me with HP UHU BOARD

    Hello;

    I am sorry for the delay, I seldom read the posts on this forum anymore because of the lack of free time. If you are still interested in the HP-UHUs I could email you the Gerber and NC...
  5. Thread: Andrey's UHU HP

    by kreutz
    Replies
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    3,809

    Re: Andrey's UHU HP

    The system should be wired so, if there is an axis drive error, Mach3 should go into EMG stop and the drives should get de-energized. It all depends on your EMG stop circuit wiring and how you want...
  6. Thread: Andrey's UHU HP

    by kreutz
    Replies
    43
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    3,809

    Re: Andrey's UHU HP

    Please, re-solder all the components in the Vref circuit, check also the potentiometer and other resistors in the circuit using an ohmmeter. You can also compare voltage measurement with the other...
  7. Re: X and Y Linear Motion Problems on new 3040Z-DQ Chinese CNC

    So much for the test software, the "excellent computer" turned out to be the problem :)

    Congratulations!! and thank you for the follow-up. From now on I won't trust that software.
  8. Replies
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    Re: Stepper motor- increasing speed rotation

    Since you are saying you are using 1/128 micro-step mode:

    2x speed increase ...............use 1/64 micro-step mode
    4x speed increase ..............use 1/32 micro-step mode
    8x speed increase...
  9. Re: X and Y Linear Motion Problems on new 3040Z-DQ Chinese CNC

    Phase current adjustment should be on the drives. As the manufacturer for instructions.
    Phase inductance is the inductance of the phase coils inside the stepper motor. Inductance acts as a...
  10. Re: X and Y Linear Motion Problems on new 3040Z-DQ Chinese CNC

    Your steppers are stalling. If your stepper drives have phase current adjustment, please, check the set current is the right for your steppers, otherwise adjust it to the right values. Check also the...
  11. Replies
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    Re: High Power UHU Thread (HP.UHU)

    Try 4.7 ohm for starting point. None of those mosfets are good candidates for HP-UHU, If you want to try them is ok, But I am sure they will not be reliable, in the long term, even at 100V.

    kreutz
  12. Replies
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    Re: High Power UHU Thread (HP.UHU)

    irfp4668: look at the SOA curve. At 30A the voltage limit is less than 100V. Not good for 130V motor. VR for the diode is specified at 100V.
    irfp4768: The SOA is a little better but at 30A is about...
  13. Re: Please help - X2 mill reversing DC motor mystery

    I second AL_The_Man test. Did you check/clean the motor brushes?
  14. Replies
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    Re: High Power UHU Thread (HP.UHU)

    On the revision R1.0c pcb the only things to change are the capacitor C28 (to a 2.2uF/25V film capacitor), C29 (to 470pf/50v ceramic) and desolder R16 lead to +5V and wire a cable from +15Vdc to...
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    Re: High Power UHU Thread (HP.UHU)

    The diode/2.2k resistor is a modification on Rev 1.0E because on the Rev 1.0D+ (previous revision) the Slow O.C. current limiter circuit was optional, so the diode and corresponding resistor weren't...
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    Re: High Power UHU Thread (HP.UHU)

    Hello;

    The comparator has an open collector transistor output designed for +/- 18Volts, so that is not going to be a problem. The Slow OC circuit charges a capacitor using a current source...
  17. Re: Please help - X2 mill reversing DC motor mystery

    Hello;

    Are the brushes on the motor exactly at 180 degrees? If they are offset it might be a uni-directional motor, sometimes employed on the treadmills, etc.

    kreutz
  18. Replies
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    Re: Current Schematcs & support information

    New Modified HP_UHU current limit circuit schematics.

    High Power UHU Thread (HP.UHU) (post # 40)

    On the old schematics (Rev 1.0), attached to this thread, replace C28 (4.7uF) by a 2.2uF/25 v...
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    Re: Revised Bills of Material for HP UHU Drives

    New Modified HP_UHU current limit circuit schematics.

    http://www.cnczone.com/forums/uhu-servo-controllers/60449-high-power-uhu-thread-hp-uhu.html (post # 40)

    regards,

    kreutz
  20. Replies
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    Re: High Power UHU Thread (HP.UHU)

    Hello;

    It's being a long time and in a last few days I have been exchanging e-mails with Henrik (H.O.). He has been involved in this little project since the beginning and I really appreciate his...
  21. Re: how many people here are 3Dprinting molds for casting?

    Take a look at the following links:
    Metal Casting with Your 3D Printer | MAKE

    Casting Wax 3D Printing Material Information - Shapeways

    kreutz
  22. Thread: G0759 Build

    by kreutz
    Replies
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    801

    Re: G0759 Build: Adding End Stops and a Touch Post

    Thank you for sharing details of your conversion, I also believe the NUC is going to be a good platform for Mach3 with independent CNC controller (but I would rather use an ethernet controller) ....
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    Re: missing steps with a "low" feed

    It is not only the stepper drives what determine machine performance . It is the PC, Operating System (real time or not), CNC software, step generator (dedicated board or PC generated), drive, motor...
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    Re: missing steps with a "low" feed

    The TB6600 seems to have better specs for CNC, just make sure the step pulses are 2.2 uSec or longer. But the rest of the drive design will also influence the performance.
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    Re: missing steps with a "low" feed

    If you are using a drive based on the TB6560 you must be aware of the chip limitations. Maximum step frequency is 15 Khz, minimum step pulse duration is 30 uSec. Mach3 step pulses are a lot less than...
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