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Type: Posts; User: strantor

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  1. What steps to take before mothballing a Fanuc robot?

    I am about to take a couple of old Fanuc robots out of service and they will go into storage for a few years. Long term plan is to repurpose them for another application later. I am not real familiar...
  2. Re: Analog or other alternative position feedback technologies

    Your laser talk way way over my head but I think I got the gist of it: lasers would work but not practical for CNC.

    At the place I used to work we built all-electric subsea tooling and needed a...
  3. Analog or other alternative position feedback technologies

    CNC position feedback has been exclusively encoder or glass scales in every instance that I've encountered or heard of. However there are other technologies which I've encountered outside the world...
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    Re: DIY Preload on a ballscrew

    I re-read my post it does not sound good. I came across badly. I apologize. I was trying to start a discussion about the physics behind using spacer balls vs not.

    Months ago I took apart my NSK...
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    Re: DIY Preload on a ballscrew

    You stated that like a law of physics but is it? I have seen it contested. I'm not contesting it, and I don't have an opinion either way, just bringing up the fact that there are other opinions. I...
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    Re: DIY Preload on a ballscrew

    I am also interested in your process and where you obtain the balls. I got some cheap HGR20 linear rails and found them to be very gritty. I removed the balls, cleaned them, cleaned the ball guides,...
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    Re: Motors for small production machine.

    Your stories about the power company don't sound fun. I spent some time in Spain (~2007) and while there I noticed most homes have a solar array on top, and maybe a solar water heater. I wondered if...
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    Re: Motors for small production machine.

    Oops, forgot one:
    (8) 120kW solid state starter panels
    (0) filters
    https://www.cnczone.com/forums/attachment.php?attachmentid=457284&stc=1
    (Not quite as relevant, I don't think they have a DC...
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    Re: Motors for small production machine.

    Just for S&Gs I toured the plant I'm working at today and took some pictures of various VFD and servo installations to illustrate the common use (or lack thereof) of input reactors from various...
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    Re: Motors for small production machine.

    I would be more concerned about other electronics if I had ever seen them fail as a result of drive-induced harmonics. But as I said, I have been working with VFDs* for many years and have never seen...
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    Re: Sliding doors rack and pinion

    I'm sure you could use those to build a CNC. But the accuracy that it would have is a mystery, and will remain a mystery until after you've built it. If this is a plasma cutter or a wood routing...
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    Re: Motors for small production machine.

    I am glad you picked Yaskawa as a reference. I couldn't have picked a better source of information on this topic. I used to work field service for a Yaskawa distributor and had/got to sit through...
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    Re: Motors for small production machine.

    This discussion felt eerily familiar despite my being quite sure I've never engaged it before. Then I realized it's a dead ringer for the covid/mask debate, so there's probably a good chance of it...
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    Re: Motors for small production machine.

    IEEE is an international provider of academic guidance and recommendations, compliance is voluntary. In the US, law regarding electrical distribution is NEC/NFPA, which has this to say:


    ...
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    Re: Motors for small production machine.

    Blowing output IGBTs? I've never heard that, or seen output reactors suggested as a means of protecting the drive. According to my knowledge, output reactors are to protect the motor. Long lead...
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    Re: Motors for small production machine.

    Yes, output reactor is a different story. I use them any time lead length from VFD to motor are excessive, or if motor is not inverter duty.
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    Re: Motors for small production machine.

    Interesting idea, it had never occurred to me. I will give it a try since I do have some 3ph reactors in my cache. I wonder if it would be an improvement or if it would exacerbate the issue by...
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    Re: Motors for small production machine.

    Yes I saw that. I'm not a believer yet.

    In my line of work I deal with VFDs & induction motors quite a bit. Servos I run across occasionally, but the vast majority are VFDs. All the VFD...
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    Re: Motors for small production machine.

    Nice! Similar story...

    I'm a Controls Engineer; I design control systems for industrial process equipment (conveyors, palletizers, extruders, etc.) and CNC is more of a hobby. But people usually...
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    Re: Motors for small production machine.

    Yes I've approved a quote from DMM for a pair Dyn4 packages, just waiting on an invoice.

    Want even better prices on DMM gear? Check out their eBay store. Prices are 25% less than on their website...
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    Re: Motors for small production machine.

    Ok I've made some decisions and some purchases, now narrowed down the options to just two.

    I've purchased:
    (2) 300mm glass scales
    Raspberry Pi 4 w/10" touchscreen
    Mesa 7i97 ethernet 6 axis...
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    Re: Motors for small production machine.

    I've looked into all manner of concrete casting for improvised machine tools. All in the past. When I had little money (and now I have little time). I don't know what kind of concrete they used but I...
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    Re: Motors for small production machine.

    Tell all that to a dead blow hammer!
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    Re: Motors for small production machine.

    Thanks for the input. Yes, it will be unreasonably heavy. I would like to make it out of cast iron billets for vibration dampening but those are hard to find and expensive. I have a bunch of 3/4"...
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    Re: Motors for small production machine.

    Not sure. I know little about Galil. My understanding is that it's more of a "professional" or "OEM"-oriented system. Not sure how to phrase that without making LinuxCNC sound like a hobbyist...
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    Re: Motors for small production machine.

    Yes, they do. That's what I'm using on my mill. 5i25 + 7i77. It works very well.
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    Re: Motors for small production machine.

    I did look into it, and passed on it for reasons I can't remember. I'll look into it again. What in your opinion makes it better than LinuxCNC?
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    Re: Motors for small production machine.

    I chose linuxcnc the first time around because of the reasons you listed. My mill was a real CNC when I got it; an old one, but born to make money. It is a 1988 model and had a Dynapath controller...
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    Re: Motors for small production machine.

    Thanks for the insight Craig. Knowing more about you helps me frame the information and opinions you provide. I will think of you now as a German Engineer. Only the best will do, and all tolerances...
  30. AB Ultra 100, AD SureServo and Delta A2/3 all use the same plugs/connectors.

    This thread is for anyone googling the same things I have been for the past few years. I had a heck of a time finding interface cables for the old school Allen Bradley Ultra100 drives in my mill. The...
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