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      This is a Z-Axis for OpenBuilds ACRO system. I designed it with a few key requirements in mind:

      • has to be sturdy enough to able to carry a small drill. I drill small holes (2mm in diameter, 15 mm deep, plywood / MDF) with it. This was very important to me. This is why I tried to get the drill to be as close to the 20x40 bar as possible.
      • simple tool changing. For example, I want to quickly go from using a drill to using a laser.
      • should not deviate from original ACRO design too much
      • most parts should be be 3D-printable or easily sourceable.
      I am very happy with how it turned out and I hope you like it too.


      Here's a brief story about how I built it:


      Step 0 — Design process.

      0-cad.png


      This z axis was primarily designed to carry a small drill, so my main goal when designing it in a way that would get the drill to be as close to the center of the 20x40 extrusion as possible. I think this design gets as close to that goal as possible if we're talking using openbuilds hardware.

      Step 1 — Cutting the extrusions.

      So to give you some context, I'm doing all of this in a 1 bedroom apartment and I don't have any large tools. So my best option was to use a hacksaw (btw I didn't have a hacksaw either so I made one).

      To make the cut as good I could, I used a modified extrusion cutting jig designed by Grégoire Saunier.

      1-cutting-05.jpg

      The shortest profile you can get is 250mm and the size I needed 2 parts at 124mm. So I figured I'd just cut them in half using the jig and they would come out perfect. I was wrong of course — parts looked good after the cut but were not equal lengths. So I made this other little jig and finished the job with a file.

      1-cutting-00.JPG
      1-cutting-10.JPG
      1-cutting-20.JPG

      That got the job done well.

      Step 2 — Printing the parts.

      Printing all the printed parts was pretty straightforward, except for the biggest one — the shell. That part has a pretty large surface and it warped during the process. I wasn't too bad so I ended up using the warped part, but if was printing it again I would have probably added some brim.

      Step 3 — Assembly.

      Unfortunately, I don't really have pictures from the assembly process. It's pretty straightforward, you just put things together in the right order — nothing too complicated.

      2-parts.JPG



      Final results.

      IMG_6212.jpg
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      harlsb, Giarc, syl and 4 others like this.
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  • Build Details

    Build License:
    • GNU (GPL3+) General Public Licence

    Reason for this Build

    I needed a z-axis for my ACRO build to drill small holes.
  • Attached Files:

  • Parts list

    Qty Part Name Part Link Comments
    2 V-Slot® 20x20 Linear Rail Link Length: 124mm
    1 8mm Metric Acme Lead Screw Link Length: around 140mm, depends on the motor
    3 Screws M3, Length: 35 - 40 mm. Link This one also depends on the motor
    1 5mm to 8mm Flexible Coupling Link
    4 Aluminum Spacers Link Size: 3mm
    2 Precision Shim - 10x5x1mm Link
    8 Low Profile Screws M5 Link Length: 35mm
    4 Low Profile Screws M5 Link Length: 10mm
    12 Tee Nuts - M5 Link
    4 Self Tapping Screw Link
    1 Nut Block for 8mm Metric Acme Lead Screw Link
    2 Eccentric Spacer Link Length: 6mm
    2 Aluminum Spacers Link Size: 6mm
    4 Xtreme Mini V Wheel Kit Link
    4 Low Profile Screws M5 Link Length: 27mm
    2 Low Profile Screws M5 Link Length: 25mm
    4 Screws M4 Link Length: 12mm
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