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Thread: Open source low cost servomotor controller

  1. #133
    Gold Member joeybagadonuts's Avatar
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    Default Re: Open source low cost servomotor controller

    Macdowswe,

    You are doing a most awesome job regardless of the rumors the guy from the sunshine state is spreading.
    Got to get back to the bakery now.
    JoeyB

    A doughnut a day keeps the doctor away.


  2. #134
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    Default Re: Open source low cost servomotor controller

    I've been manipulated into accepting the following concept, there is little difference from a machine for hobby use and a machine for commercial/production use, I should expect the same performance, repeatability, precision and power based on the platform size.
    Dunno about 'manipulated', but I will go along with the demand for quality.

    Perhaps one should back off slightly and treat the area as being not one monolithic beast but several overlapping markets.
    There is the cheap Chinese wood router market for hobbyists. If someone wants such a machine for a few k$, fair enough. It's a hobby. Treat as such.
    There is the cheap Chinese 'router claiming to be a mill' market, which is where a lot of the problems arise. I'll pass on that one.
    There is the not so cheap hobby mill, which can range up to - $10K maybe? Your call.
    Thene there is the serious hobby and light machine shop market. Easily up to $15k.

    The last two should be able to handle hard aluminium and, I would hope, steel. I would expect tolerances down to 0.01 mm for the more serious machines, with resolution well below that.

    The motor powers I quoted allow me to machine steel, SS and titanium accurately. Dunno about the speeds: I work in metric, but my machine and expectations are maybe lower than yours. That's OK: I am more concerned with quality than speed. My machine meets my requirements for quality. Cutters for steel and Ti are a bit more expensive if I want them to last.

    Cheers
    Roger



  3. #135
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    Default Re: Open source low cost servomotor controller

    I am excited to let you know that the time has finally come for the alpha stage of the ODrive project!

    Alpha release
    This consists of two components, the alpha software release and the manufacturing run for ODrive v3.2.
    The alpha release will include all the core features of the board, and allow go-to commands sent over USB, as well as step/direction interfacing. You can check which features will be included in the release on the roadmap.

    ODrive v3.2
    The new design is ready, and can be reviewed on github. The design will go to production on Monday the 17th of April, and you can get in on the production run here.



    More info
    If you want to read more about it, you can check out the blog post.



  4. #136
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    Default Re: Open source low cost servomotor controller

    Wow that demo video is mad!

    When does the 3/4 axis come out? ;-)

    cheers, Ian

    It's rumoured that everytime someone buys a TB6560 based board, an engineer cries!


  5. #137
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    Default Re: Open source low cost servomotor controller

    Hey Ian, Thanks!
    The plan is to make v4 3-axis. But it will be at least half a year until v4 is ready. But you can just use two v3's connected over CAN to get a 4 axis setup.

    Cheers,
    Oskar



  6. #138
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    Default Re: Open source low cost servomotor controller

    Hi,
    Just wanted to let you guys know that there is an ODrive community getting started over at https://discourse.odriverobotics.com, with some discussion that you might find interesting.

    Cheers!



  7. #139
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    Default Re: Open source low cost servomotor controller

    Hey guys, long time no post. Thought I'd show off the new demo video:





  8. #140
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    Default Re: Open source low cost servomotor controller

    Looks awesome!

    Great stuff!

    cheers, Ian

    It's rumoured that everytime someone buys a TB6560 based board, an engineer cries!


  9. #141
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    Default Re: Open source low cost servomotor controller

    It's pretty cool what you're doing.

    I quickly brought myself up to speed by skimming through the posts and trying to skim more quickly through the fight parts, although I admit I was rooting for one or two people (won't say who).

    I was actually flying electric RC planes earlier today.

    macdowswe,

    First of all, very awesome, I wish I had your skill set sir.

    A couple of questions for you (or anyone who knows)

    The demo video (post #139), very nice, how long have you been able to continuously run that machine for? What acceleration values are you using? Looking for inches per second squared or meters per second squared or G's, something like that.

    I had a look through this document you posted in a previous post:

    https://docs.google.com/spreadsheets...H4Y/edit#gid=0

    Is the torque in Nm (column H) valid across the entire speed range? If not, is there a torque vs speed graph? Also, do you know what the rotor inertia is for the different motors?

    I ask, because I'm thinking of doing the math using some different gear reducers to predict the performance of larger, heavier machines using ball screws or rack and pinion including inertial effects. For example, calculating the maximum linear acceleration at different speeds (In mach 3 for example, you can only enter one acceleration value and you are stuck with that one value up to your top speed), the cutting force available at different speeds using a constant acceleration value, etc.

    Also, not quite sure what you are doing for a power supply? Earlier there was some talk of using batteries to help out during peak demand? I can use up a 4 cell lipo in 7 minutes, but it takes 45 minutes to recharge, and that's just for one motor.



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Open source low cost servomotor controller
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