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Type: Posts; User: mcardoso

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  1. Re: R8 Adapter for AXA toolpost. Has anyone tried this?

    Maybe it wouldn't work perfectly out of the box, but with a simple modification it could work. I'm thinking of a 3/16" thick steel disk with a 3/4" clearance hole in the center and two counter sunk...
  2. Anyone familiar with motion controllers/software which can support dual loop control?

    I am currently running Mach 4 with Allen Bradley Ultra 3000 AC servo drives. This is open loop from the perspective of the control, but closed loop at the motor. I am curious (educational use only)...
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    Re: PCNC 1100 Info

    What a steal. Nice job :)
  4. Re: R8 Adapter for AXA toolpost. Has anyone tried this?

    Not cheap: Aloris 5-C Collet Holder - AXA-5C - Penn Tool Co., Inc

    Lots on ebay for ~$150. Some have lever closers
  5. Re: R8 Adapter for AXA toolpost. Has anyone tried this?

    For those who have CNC mills running TTS tooling, we often have many tools preset in holders and loaded in the tool tables of our machines. It would be really nice to clamp a tool in the toolpost for...
  6. Re: R8 Adapter for AXA toolpost. Has anyone tried this?

    I have the same investment in TTS and this is an AWESOME idea. Thinking of a quarter turn lever clamp on the back to clamp/unclamp the tool. It wouldn't need to be R8 necessarily. Maybe you could...
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    Re: Lathe Conversion, PM1228 to CNC

    Why not use a chunk of cast iron? It is relatively easy to machine (although dirty) and would be better for rigidity and vibration damping than either Steel or Aluminum. You can buy cast stock from...
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    Re: Buying first metal lathe

    I did the goofy thing which was to rebuild an import :). Well it was mostly a teardown and clean. If your hobby isn't machine rebuilding or staring at old american iron then an import will do you...
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    Re: Lathe Conversion, PM1228 to CNC

    Enclosure looks great! Nice work, very professional.
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    Re: ENCO RF45 Clone CNC Conversion - LinuxCNC

    Just saw this build and I have to say excellent work! I have a fully converted G0704 which I got my Freshman year of college. Looking back I wish I had gotten a bigger machine :) Congrats
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    Re: Lathe Conversion, PM1228 to CNC

    What a stunningly clean conversion. Beautiful work. Would also love to see the electronics enclosure.
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    Re: Buying first metal lathe

    I own a Grizzly mill which required a surface cleaning to remove the cosmoline packing grease, but other than that I ran it right out of the box without any issues. I don't own one of their lathes so...
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    Re: Buying first metal lathe

    I would seriously recommend getting a little more lathe than you think you'll be able to use at this time. I have bought from grizzly and found their stuff perfectly fine to use out of the box. Some...
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    Poll: Re: How fast is your homemade CNC?

    I wish :) It would be a heck of a lot more rigid than it is.
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    Re: mach3 or control board?

    Pat, you might have your jogging mode set to incremental. If you press tab in Mach 3 it should bring up the jogging console. Look if the continuous jog is lit up, or if it is set to incremental. Also...
  16. Re: Motor Acceleration...whats a good value to have?

    Isn't that the truth. My first build was 10 years ago and it was hard to find parts and information even then. It is amazing how much this hobby blew up.
  17. Re: Motor Acceleration...whats a good value to have?

    On my benchtop CNC (G0704) running AC servos, I have my velocity set to 1000 ipm and my accelerations set to 400 in/s/s (1G). It really punches when making rapid moves, but the cutting is so much...
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    Poll: Re: How fast is your homemade CNC?

    My benchtop with AC servos hits 1000ipm with some crazy accelerations no problem. Since I do mostly 1 offs (really never more than 10), my Rapid override is always set to 5%. Seems kinda silly :)
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    Re: High Speed VFD Required

    You may find it a little difficult to find high frequency output VFDs. By US export law, most VFDs and motor drives are limited to 590Hz output frequency in order to prevent the proliferation of...
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    Re: Trying to grasp lathe tooling

    Did a bunch of deep bearing bores similar to what you're talking about here. Dial in the starting diameter to be very consistent then your finish pass will have the same deflection from part to part....
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    Re: Trying to grasp lathe tooling

    Ouch! $20 per cutting edge. Bet it works well though. Thanks for the links guys.
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    Re: Trying to grasp lathe tooling

    Quinn,

    If you can find an aluminum specific grooving/parting insert, please let me know. I've never been able to source one. As the width of the insert increases, the strength and stability of...
  23. Re: Mike's G0704 AC Servo Rebuild (Picture Heavy)

    So I've totally dropped the ball on updating this (I still want to get it finished up). If you want the full thing, it is posted on Hobby Machinist under the same title.

    I was offed by having to...
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    Re: Trying to grasp lathe tooling

    I would really recommend against pulling the insert further out of the holder. If you are using the kind that hold thin grooving inserts, you'll probably end up breaking the insert and holder. They...
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    Re: How stiff is your machine?

    After much reading on the topic thanks to this post, I agree with your number to shoot for. Certainly going to be tricky, good luck!
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