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  1. Take the 4x8 cm extrusions and 4x4 extrusions and make a box.
    • Take the 4x8 cm extrusions and 4x4 extrusions and make a box.

    • Take a FreeCAD image snapshot here and throughout.

  2. Start by taking the 4080 extrusions - the short sides - and mounting the corner brackets to them.
    • Start by taking the 4080 extrusions - the short sides - and mounting the corner brackets to them.

  3. Take a corner bracket. Use the corner bracket with the ridge in the middle.
    • Take a corner bracket. Use the corner bracket with the ridge in the middle.

  4. Put in 4 spring nuts. Note that these may be inserted from the top of the rail, not necessarily from the side. Use 4 of these per corner bracket.
    • Put in 4 spring nuts. Note that these may be inserted from the top of the rail, not necessarily from the side. Use 4 of these per corner bracket.

  5. Detail of spring nut. it has a sprung ball on the back side.
    • Detail of spring nut. it has a sprung ball on the back side.

  6. Mount the first bracket on a corner. Put the short side of the bracket on the short frame side, and the long side of the bracket on the long side. Do not tighten yet.
    • Mount the first bracket on a corner. Put the short side of the bracket on the short frame side, and the long side of the bracket on the long side. Do not tighten yet.

  7. Insert the next 4 spring nuts. When inserting these, have the bolt holes near each other. Use a screwdriver to roll the spring nuts into the slot.
    • Insert the next 4 spring nuts. When inserting these, have the bolt holes near each other. Use a screwdriver to roll the spring nuts into the slot.

  8. To install the corner brackets, put in the 4 screws in first.
    • To install the corner brackets, put in the 4 screws in first.

  9. Use the 10 mm long, 5 mm diameter screws here.
    • Use the 10 mm long, 5 mm diameter screws here.

  10. Do the second short side 4080 extrusion - use short side of bracket. Do not tighten yet. Then put the frame in a position to connect the 4 sides together at the corners. Adjust location of corner brackets as needed.
    • Do the second short side 4080 extrusion - use short side of bracket. Do not tighten yet. Then put the frame in a position to connect the 4 sides together at the corners. Adjust location of corner brackets as needed.

  11. Insert the spring nuts on all corners, then bolt the 4 sides together.
    • Insert the spring nuts on all corners, then bolt the 4 sides together.

  12. With corners loosely in place, now fit the 4040 member next to the short edges of the frame. Do the same on the other side.
    • With corners loosely in place, now fit the 4040 member next to the short edges of the frame. Do the same on the other side.

  13. Put 4 spring nuts in each corner to mount the 4040 member
    • Put 4 spring nuts in each corner to mount the 4040 member

  14. Use a flat bracket.
    • Use a flat bracket.

  15. Use 4 screws, now 8 mm long. Start screws on all sides. Do not tighten yet.
    • Use 4 screws, now 8 mm long. Start screws on all sides. Do not tighten yet.

Finish Line

Robert Kirk

Member since: 04/28/2013

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24 Guides authored

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