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IndustryArena Forum > OpenSource CNC Design Center > Open Source Controller Boards > Probably the smallest 3 axis controller???
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  1. #41
    Join Date
    Jun 2003
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    3312
    see post 37
    Phil, Still too many interests, too many projects, and not enough time!!!!!!!!
    Vist my websites - http://pminmo.com & http://millpcbs.com

  2. #42
    Join Date
    Sep 2004
    Posts
    15
    AND YES!!!! I RUN IT With alot of improvisation (not build alexander current limiter yet) , i used alooot of ceramic resistors is series (im not shure if i limit the current correct) and that was all for testing and learning this stuff. Im so happy! pmnmo you best man on inet and im very thankful for all help! Now i have some more questions.
    1: I used minebea 17PM-H005-P2V2 1.8degree stepper 0.9A, 4.7ohm (if this is correct specs , i find that on some spanish forum or so). on PS 24V , motor run nice and smooth but only till ~70mm per minute velocity (in mach3 motor tuning) and its abit slow. On higher values , motor just buzz /or its realy at low torque. I asume that problem is in low PS voltage or in wrong specs for my motor (so i didnt limit current right etc) ?
    2: for logic suply i used 5v from pc psu and i limit it with 280ohm resistor so i get 5V 20ma for 1 pic (i put just 1 pic on board) , now when i put all 3 pic on board do i need 5v
    ~60ma ? tell me if im correct on this.
    P.S big thanx to alexander for this great board for someone who are not so good at electronic!

  3. #43
    Join Date
    Jun 2003
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    3312
    As steppers go up in rpm's different issues perk their pesky heads, resonance, suplly voltage, motor inductance... This may help you some: http://pminmo.com/PMinMOwiki/index.p...chanical_Power

    You don't need a resistor to limit the current on the 5V for the pics.
    Phil, Still too many interests, too many projects, and not enough time!!!!!!!!
    Vist my websites - http://pminmo.com & http://millpcbs.com

  4. #44
    Join Date
    Sep 2004
    Posts
    15
    Tnx im gona study that.
    One more question and i think its the last one
    Its say its for max 30VDC 5amp , can i use abit higher cus i have 40volts PS? I use irfz 44N. And whats max voltage if VAC is used?

  5. #45
    Join Date
    Jun 2003
    Posts
    3312
    IRFZ44 isn't a good choice, they may work, may not depends on the batch. This circuit should use logic level mosfets, for example the IRLZ44. With the IRFZ44 your supply voltage shouldn't be higher than 26V and that's pushing it. Take the Vdss rating and divide by 2 and it should be lower than that.
    Phil, Still too many interests, too many projects, and not enough time!!!!!!!!
    Vist my websites - http://pminmo.com & http://millpcbs.com

  6. #46
    Join Date
    Sep 2004
    Posts
    15
    Oh my What is best substitution for IRLZ44N? Cant find them at local electronic shop's ..
    I used irfz cus i read "but any type LZ´s or FZ´s will do..." on howto.txt.

  7. #47
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    Jun 2003
    Posts
    3312
    Do an internet search for logic level N channel mosfet. I could give you numbers but your avaiability would be a different issue.
    Phil, Still too many interests, too many projects, and not enough time!!!!!!!!
    Vist my websites - http://pminmo.com & http://millpcbs.com

  8. #48
    Join Date
    Sep 2004
    Posts
    15
    Is IRL530N , IRL540N fine? I can get this. Its 100V rated so i can use ~40V PS for my motor with no problems? ty for help

  9. #49
    Join Date
    Jun 2003
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    3312
    The IRL540 is logic level, and 100V I think it will work for you ok. It's capacitance/charge characteristics are higher than some newer logic level mosfets.
    Phil, Still too many interests, too many projects, and not enough time!!!!!!!!
    Vist my websites - http://pminmo.com & http://millpcbs.com

  10. #50
    Join Date
    Aug 2005
    Posts
    578
    Phil

    Will a D44T2 mosfet work on this board? I have a hundred of these and would like to utilize them.

  11. #51
    Join Date
    Jul 2010
    Posts
    0

    Thanks


    Hi Alexander 666.

    I wanted to write and thank you for taking the time to publish your very good controller and chopper designs.

    Will definitely be building this as my first foray into CNC. Will be doing some routing but started out with this idea to drill PCB's which as you would know is a real pain. Hope you can help me with the following questions re your designs.

    1. The motors to use. I know absolutely nothing even after some time in the CNC Forum. My local electronics shop has these: http://www1.jaycar.com.au/productVie...4&form=KEYWORD OK for a start?

    2. Software. I have been using PIC chips and VB6 for years so no problem there. But the Mach3 software is very expensive so is there any problem (pros/cons) of using a VB interface?

    3. Do you have any suggestions about the actual CNC machine? Will be using a Dremel 240 volt for the PCB drilling so do I need more motor steps to achieve place accuracy < 1mm?

    Thanks for your time.

    cheers
    Dave

  12. #52
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    Sep 2010
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    0
    Is there a pic that doesn't have to be programmed that will work with this circuit? I don't have the know how nor the means to program a pic.

  13. #53
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    Jun 2003
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    3312
    Quote Originally Posted by nate89 View Post
    Is there a pic that doesn't have to be programmed that will work with this circuit? I don't have the know how nor the means to program a pic.
    No
    Phil, Still too many interests, too many projects, and not enough time!!!!!!!!
    Vist my websites - http://pminmo.com & http://millpcbs.com

  14. #54
    Join Date
    Mar 2010
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    0
    666,

    Love the simplicity, working on building a home-CNC with "the smallest 3 axis controller"
    Just wondering How to set the 'home' and 'limit' switches?

    Please help as best as you can.

    Thanks,
    Raj

  15. #55
    Join Date
    Jun 2003
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    3312
    I believe I've answered that on my Bboard in this set of threads: http://pminmo.com/phpBB2/viewforum.p...a236b141c00400
    Phil, Still too many interests, too many projects, and not enough time!!!!!!!!
    Vist my websites - http://pminmo.com & http://millpcbs.com

  16. #56
    Join Date
    Mar 2010
    Posts
    0

    Smile

    PMinMO,

    Thanks for that....
    lot of listings..... seems to have a lot of other topics of my interest too....
    will go through.

    Thanks,
    Raj

  17. #57
    Join Date
    Mar 2010
    Posts
    0

    this seems correct?

    PMinMO,

    Thanks for the URL ... read through ...
    Now,
    If using MACH3, One home switch per axis,
    No limit switch (will be defining soft-limit in MACH3)
    then, please see attached image ..... this is correct?

    Thanks,
    Rajeev
    Attached Thumbnails Attached Thumbnails homequest.jpg  

  18. #58
    Join Date
    May 2005
    Posts
    1397
    Quote Originally Posted by 666 View Post
    The PIC as a current limiter.... Sounds smooth...

    Looking forward to hear how you do that... You could for instance use a a/d converter and measure voltage drop over a shunt resistor. Could be interresting to see if it can be done. Think it would be a perfect and fast solution.
    And that would be (pretty much) a Linistepper:

    http://techref.massmind.org/techref/...step/index.htm

    http://techref.massmind.org/techref/...p/lini_wks.htm

    You would also need to add PIC code for microstepping...

    Parallel evolution?

  19. #59
    Join Date
    Apr 2005
    Posts
    81
    I know the .hex is available but I was wondering if the asm is. Just playing around thinking of changing the code to single phase full step instead of double. I decompiled the hex but it looks like there could be a few issues in the decompiled version and a commented piece of code could help out a lot.

  20. #60
    Join Date
    May 2005
    Posts
    1397
    Quote Originally Posted by rkremser View Post
    I know the .hex is available but I was wondering if the asm is. Just playing around thinking of changing the code to single phase full step instead of double. I decompiled the hex but it looks like there could be a few issues in the decompiled version and a commented piece of code could help out a lot.
    Are you asking about the Linistepper? The ASM is available right from the main page under "Features" click on "PIC Software"
    http://techref.massmind.org/techref/...step/index.htm

    The direct link is
    http://techref.massmind.org/techref/...p/lini_asm.txt

    If you make a usable change, please consider sharing it with us as others have:
    http://techref.massmind.org/techref/...istep/mods.htm

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