Is your router frame a parallelogram? Mine was!

Update on my parallelogram situation. Did the following:

  1. Took everything apart

  2. Added another board on top of my existing table to achieve a surface as flat as possible

  • For me this was with 1 mm in each direction using a flat edge; side to side, front to back, and diagonals.
  • I used used jack hand plane to flatten the board underneath, then glued a 5/8" melamine 4’x4’ piece on top with construction adhesive.
  1. Followed the Onefinity assembly video with these additions:
  • Used a center punch (wrapped it in a few layers of hockey tape to get it just the right size for the mount hole) to mark each hole. This worked surprisingly well at getting dead center.
  • Pre-drilled each mounting hole using a 8" long 1/8" drill bit per forum.
  • Used #9x2" GRK screws (GRK Fasteners | R4 Multi-Purpose Screw) with #10 washers to mount. These allowed for a bit of play for adjustment, but easy to use and stable.
  • Compulsively checked the diagonal distances and for square against the known straight bottom each of the mounting board. Moved the gantry back and forth several times while checking.
  • Mounted front corners as per video with gantry in front, then all back mounts with gantry at the back (4 on each), then the rest of the front mounts.
  • Check distances and square again (then once more).
  1. With everything seemingly accurate (and connectors etc. attached), used the game controller to mark each corner as per this: Square your X and Y axis - CNCnutz Episode 212 - YouTube
  • Those measurements were as perfect as I was able to measure: 81.5 cm on edges and 115.4 cm diagonals.

Discoveries:

Conclusions:

  • Having a moonscape tabletop may not be sufficient for mounting the Onefinity.
  • Check your rails for twist (can’t do this with a flat top for reference)
  • Check your measuring tools for accuracy!

With thanks to those with constructive comments and kind offer to supply the mounting template @Aiph5u, @TheyCallMeJohn, @TMToronto

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