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890KV OX RC spindle

Discussion in 'Other Builds' started by Robert Hummel, Jan 13, 2014.

  1. Robert Hummel

    Robert Hummel Custom Builder
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    For now I would like to make things work in the following manor, one of my relays will control power to the ESC "M8/M9" when enabled an attiny will pulse and bring the spindle to start state, beep beep beep
    So if I can say have 3 buttons high,med,low that would work fine for me.
    Once spindle is ready pick speed and attiny spits out the correct ms signal.
    Now to get that all working is going to be the fun part :)
    I never really adjusted the speed much when I used my RC spindle it was more of a turn the pot to pre marked spots deal.
     
    #121 Robert Hummel, May 21, 2014
    Last edited: May 21, 2014
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  2. oni305

    oni305 Well-Known
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    why not using an NE555 instead fof the attiny for this (and continuing to use the trimmer to regulate the speed)??

    http://makezineblog.files.wordpress.com/2013/05/figb.png?w=620&h=452
     
  3. Robert Hummel

    Robert Hummel Custom Builder
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    Consistent set points instead of guessing and having to turn the dial,
    With my last 555 timer you had to turn it slow till the three beep sounded then you could start the spindle.
    This way I hope to set the power up ms to 1 and then have three increments up to 2ms.
    simply to have it automated I guess as there is no rpm read out.
    Also I have made a circuit that I hope wil be able to adapt to the Mach3 idea later down the road for my other mill :)

    Skinning the cat a different way :)
     
  4. Robert Hummel

    Robert Hummel Custom Builder
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    Here is the prototype :)
    Since the code I'm going to try and use is proven I went ahead and made it so if all works I don't need to build it again ;)
    image.jpg
     
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  5. oni305

    oni305 Well-Known
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    remember: the pwm after the optocoupler is inverted
     
  6. bit53b

    bit53b New
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    Yes there are so many ways to do this, so many adventures :)
    Encoder, RPM display and constant surface speed is just around the corner!

    I checked the source code for GRBL. True, spindle speed, "S" is not supported now, but there is a comment in there that says it may come back if PWM issues can be sorted.
     
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  7. Anthony Webb

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    Look like I'm in the market for a new spindle, what are the dimensions of your spindle?
     
  8. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    You've got the rail behind the spindle set too low. Ref: [​IMG]
    You could also gain a little more upward movement by shimming the mounts out to help the spindle clear the top plate.
     
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  9. Anthony Webb

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    Thanks Rick! I moved that to look more like the screenshot you posted and am back up to 2 inches travel. Not ideal, but I can work with it. I still do want one of these fancy spindles though, wish someone would kit it out :)
     
  10. Robert Hummel

    Robert Hummel Custom Builder
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    It's 110mm by 50mm
    Sorry for the delay I'm swamped
     
  11. Robert Hummel

    Robert Hummel Custom Builder
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    So this is what I have come up with so far.
    I have made a circuit that when the spindle on signal from the arduino nano goes high, the attiny 85 is powered on.
    I have flashed the tiny with a blink code for testing and when powered the code begins to run.
    I kind of understand the 8bit libary but can't get the hex loaded onto the tiny.
    From my understanding I have 2 pwm outputs and 3 anolog inputs I can play with.
    I have pwm 1 in the circuit as the output and want to generate a pwm at startup with each anolog pin when brought high producing a ms pulse for low, high and default.

    So to the point, can this be done using the 8bit hex or should I be looking at generating code to spit out the requested ms pulse at power up and logic highs?

    Sorry still learnin the programing side of things here lol
     
  12. oni305

    oni305 Well-Known
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    You have to write you own code using the library, you have to INCLUDE the library in the source code
    1) follow this: http://arduino.cc/en/Guide/Libraries
    2) after you can write your own sketch following the example
     
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  13. Robert Hummel

    Robert Hummel Custom Builder
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    Parts are in so I gotta get this done lol

    image.jpg
    Went with a different type of collet, ER11M instead of the reg ER11A
    Now where's the coffee pot?
     
  14. Robert Hummel

    Robert Hummel Custom Builder
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    The diff is the way it locks and it's lighter.
    It comes with a special locking wrench :)
     
  15. Robert Hummel

    Robert Hummel Custom Builder
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    And here it is :)
    image.jpg
    Picking up the m4 screws tomorrow and then it's testing time ;)
     
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  16. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    That was quick. What motor are you running and what rpms are you anticipating?
     
  17. Robert Hummel

    Robert Hummel Custom Builder
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    It is 890kv as all my others, it's the sweet spot @12-14 vdc IMO
    RPM max no load will be around 10,000.
    This one is a little different as it's going on the Stinger PCB mill ;)
     
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  18. Jestah

    Jestah Well-Known
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    I have just got word that NZ customs is going to let go of my last shipment from openbuilds so I think this weekend is going to be grand!!!

    Thanks for the advce before regarding the PSU for the esc but I am still a little unsure what current the ESC to spindle cable is going to have to withstand. I am assuming looking at the ESC and motor cables being THICK and the ESC being rated at 100A (really?!?!?!) but what would be a safe conductor size for a run no more than 2-2.5m ?
     
  19. Robert Hummel

    Robert Hummel Custom Builder
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    I use 16 awg as your not going to pull more then 10 amps.
    A 12 foot shielded power supply plug works well :)
     
  20. Robert Hummel

    Robert Hummel Custom Builder
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    We'll here we are :)
    A test run of the Stingers RC Spindle
     
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  21. Tweakie

    Tweakie OpenBuilds Team
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    Excellent work Robert. :thumbsup:

    Tweakie.
     
  22. Robert Hummel

    Robert Hummel Custom Builder
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    Ty my friend :)
    I'm just waiting on a programmer and chips to try your control idea.
    I have this programmer but couldn't figure out how to use it as the documentation was poor.
    http://www.ebay.com/itm/121218543160
     
  23. Tweakie

    Tweakie OpenBuilds Team
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  24. KerryH

    KerryH New
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    Forgive me if this question seems very basic, but I'm pretty new to all this and I'm trying to understand things better.

    What are the pros and cons for a setup like this versus something like the typical Bosch Colt or Dewalt DWP611 besides the obvious size difference?

    It is certainly an interesting approach and looks very promising. It's definitely got me looking up the parts mentioned in this thread.
     
    #144 KerryH, Jul 18, 2014
    Last edited: Jul 18, 2014
  25. Jestah

    Jestah Well-Known
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    An outrunner is:
    lighter
    fairly cheap to build
    Speed control is also very nifty for getting the right spindle speed to feed (chipload)
    An ER11 collet will only take a 7mm or smaller shank tool
    may not have the power at low RPM to drive big fly cutters (if you can even get them on a 7mm shank)

    A router is:
    more powerful
    can take BIG tools
    will remove more chips per hour
    louder
    often has no stock speed control
    A lot more weight so more stiffness will be needed in your gantry and Z axiz as well as slower z rapid speeds.

    For me an outrunner was a good balance of weight to power for a small desktop router that I don't need anything bigger than a 7mm tool so was the winner. In saying that I am thinking of mounting a small water cooled spindle (3-4kg) onto a bigger project soon now that the polycarb V wheels are out!
     
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  26. KerryH

    KerryH New
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    Awesome, I'm considering a very small desktop build to get me started, and I wanted to make sure I wouldn't be over looking an obvious downfall to this style spindle.

    I can definitely appreciate the difference in noise, I bought a proxxon rotary tool over a dremel because of that.

    Thank you for your detailed response!
     
    #146 KerryH, Jul 18, 2014
    Last edited: Jul 18, 2014
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  27. Robert Hummel

    Robert Hummel Custom Builder
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    Could not have explained it any better ;)
     
  28. Atomist

    Atomist New
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    Tweakie did a build log. Software speed control

    What's wrong with using this to control the PWM signal?

    RCNC brushless motor controller

    Works with Mach3 and EMC2(most likely other software)
    Allows On/Off and variable speed control of an RC style brushless motor
    DB25 Male to DB25 Female port design works with any parallel port driver board
    Standard Futaba female connector for connection to any brushless ESC
    No plugins or additional software required - simple setup within Mach3 or EMC2
    Ability to use any outpin pin for spindle control (pins 1-9, 14, 16, 17)
    "Pass thru" design allows all parallel port signals from the computer to pass thru the RCNC to the driver board (including pin used for spindle control)


    http://www.logicnc.com/rcnc.html
     
  29. Tweakie

    Tweakie OpenBuilds Team
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    Hi @Atomist ,

    Absolutely nothing wrong with using the Logiccnc controller at all. :thumbsup:

    (If you check the second paragraph of my build you will find the link to Logiccnc).

    Tweakie.
     
  30. Marios

    Marios New
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    What Render program are you using?
     

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