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Type: Posts; User: pminmo

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  1. Replies
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    Re: PMinMO.com is down

    See post http://www.cnczone.com/forums/open-source-controller-boards/326078-cnc.html#post1984706
  2. Thread: PMinMO Status

    by pminmo
    Replies
    6
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    5,128

    PMinMO Status

    I thought I'd take a moment and explain my disappearance from here as well as my website pminmo.com for those that might remember me. In late Jan 2014 I was diagnosed with stage 4 cancer. The...
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    448

    Vexta NEMA 34 Stepper Motor

    stepper motor | eBay
  4. Replies
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    532

    Nema 34 Stepper motor

    NEMA 34 Stepper Motor | eBay
  5. Thread: Blank PCB Sale

    by pminmo
    Replies
    0
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    929

    Blank PCB Sale

    I'm having some health issues and It's march madness, so get 5 blank PCBs for $15. PMinMO.com Sale: PMinMO.com PCBs

    Phil
    PMinMO.com
  6. Replies
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    3,972

    Could be: 1. a bad L297 that is causing the L298...

    Could be:
    1. a bad L297 that is causing the L298 to fail
    2. a motor wiring problem
    3. a motor problem.
    4. bad components associated with the L297 oscillaor to cause the current regulation to...
  7. Thread: a3977sed chips

    by pminmo
    Replies
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    1,253

    A3977SED and A3977KED are the same part, just the...

    A3977SED and A3977KED are the same part, just the lead free version. Digikey has both:

    Digi-Key - 620-1146-1-ND (Manufacturer - A3977SEDTR-T)

    Digi-Key - 620-1144-1-ND (Manufacturer -...
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    Need more info on the specifics of "the standard...

    Need more info on the specifics of "the standard scheme with L297 and L298". Schematic, PCB layout etc.
  9. Panels and baseplate were cut using my wood...

    Panels and baseplate were cut using my wood router: My DIY CNC Wood Router
  10. My experience with the 6560 failing is the...

    My experience with the 6560 failing is the quality of VMA and VMB at the chip leg itself. However, if a design is just thrown together not taking into consideration proper power supply timing for...
  11. Replies
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    22,222

    Sticky: In general, most monolythic stepper ICs will...

    In general, most monolythic stepper ICs will generate spurious motor noise when setting idle. It's the current control oscillators of the choppers.

    As to the Toshiba parts, they have the same...
  12. Replies
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    2,875

    The TB6560 itself isn't a bad chip, it's the...

    The TB6560 itself isn't a bad chip, it's the board designs that turn it into crap...
  13. Replies
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    Couple of points, the A3977 DOES NOT TOLERATE...

    Couple of points, the A3977 DOES NOT TOLERATE anything over 35V, and that includes back emf. So Practically don't run it at more than 27VDC power supply voltage. 2nd, you might get some thermal...
  14. Not without considerable work, the LMD has...

    Not without considerable work, the LMD has elements that would have to be done in external components.
  15. Replies
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    4,696

    I just went with a different frequency.

    I just went with a different frequency.
  16. Replies
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    4,696

    Noise filter on the current sense lines.

    Noise filter on the current sense lines.
  17. Replies
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    1,852

    You need to set an acceleration profile, you just...

    You need to set an acceleration profile, you just can't start a stepper and have it go from 0 to x instaneously.
  18. Replies
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    6,183

    Kind of an interesting set of questions......

    Kind of an interesting set of questions... efficiency of panel verses angle error would dictate the how long and how much I would think.

    In really round numbers, sun moves 180 degrees in 12 hours,...
  19. Replies
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    6,183

    Yes you are correct, you are consuming power...

    Yes you are correct, you are consuming power although 67 watts is subjective to motor drive method. Regardless of driver method, IMHO, for it to be efficient you need a mechanical break that holds...
  20. Replies
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    5,533

    Many things are possible given enough...

    Many things are possible given enough components...... If your asking using one A3985 to drive two H-bridges, it's not practicle. The fact that you wan't to run them at different speeds makes it...
  21. Replies
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    32,632

    I haven't done anything with it for a long, long...

    I haven't done anything with it for a long, long time. I was offered a part time position with a local university designing instrumentation electronics for astrophysics research, so I unretired. ...
  22. Replies
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    32,632

    Not sure what you mean, as a nema 17 4 wire motor...

    Not sure what you mean, as a nema 17 4 wire motor isn't a problem, and 24V motor supply isn't a problem.
  23. Sticky: Again, the regulators in the circuit, as...

    Again, the regulators in the circuit, as designed, DON'T play in the motor current......... You don't need a 5A regulator for a less than a 100ma. If you look at what the LM317 runs, it's the 5V...
  24. Sticky: Both the 317 and 338 are floating regulators, so...

    Both the 317 and 338 are floating regulators, so max input to them is the regulated output voltage plus the differential max. So for a LM317 that is configured as a 5V regulator, 45V is the max...
  25. Sticky: Where do I say you can sub a LM138..LM338? As...

    Where do I say you can sub a LM138..LM338?

    As far as I know the LM138..LM338 are only available in TO-3 packages. The pcb for the L297-8, the LM317 is a TO-220. Two entirely different...
  26. Thread: Missouri

    by pminmo
    Replies
    101
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    4,074

    Yes in St. Peters.

    Yes in St. Peters.
  27. Replies
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    68,949

    Allegro notified me last week, I should be...

    Allegro notified me last week, I should be getting some parts to evaluate.
  28. Replies
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    You don't have to use NC switches except on...

    You don't have to use NC switches except on Estop. The G540 four inputs just pass a logic state to the parallel port as long as they see an open or a gnd (terminal 12) on the input. You just need...
  29. Replies
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    http://www.fairchildsemi.com/ds/LM/LM7805.pdf ...

    http://www.fairchildsemi.com/ds/LM/LM7805.pdf

    Page 2 Vi 35V for Vo 5 to 18V

    http://www.st.com/stonline/books/pdf/docs/2143.pdf

    Page 22 Vi 35V 35V for Vo 5 to 18V
    ...
  30. Replies
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    L05 is 30vdc, standard 7805 is 35VDC max in. ...

    L05 is 30vdc, standard 7805 is 35VDC max in. Some spec it as 30V differential input to ouput which is still 35VDC in.
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