# Is your router frame a parallelogram? Mine was!

**URL:** <https://forum.onefinitycnc.com/t/is-your-router-frame-a-parallelogram-mine-was/6086>\
**Category:** Original/PRO Series (Buildbotics) (Gen 1)\
**Created:** [June 12, 2021, 6:58pm UTC](https://forum.onefinitycnc.com/t/is-your-router-frame-a-parallelogram-mine-was/6086 "2021-06-12T18:58:58Z")\
**Posts on this page:** 1\
**Showing post:** 54

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**Author:** ![woodsnipper](https://avatars.discourse-cdn.com/v4/letter/w/958977/32.png) [@woodsnipper](https://forum.onefinitycnc.com/u/woodsnipper)\
**Post date:** [September 12, 2021, 2:42pm UTC](https://forum.onefinitycnc.com/t/is-your-router-frame-a-parallelogram-mine-was/6086/54 "2021-09-12T14:42:53Z")

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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 ([R4™ Multi-Purpose Screw | GRK Fasteners](https://www.grkfasteners.com/products/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: [https://www.youtube.com/watch?v=lU0iZKajpoo](https://www.youtube.com/watch?v=lU0iZKajpoo)

- Those measurements were as perfect as I was able to measure: 81.5 cm on edges and 115.4 cm diagonals.

### Discoveries:

- One of my y-rails had a twist. I fixed it using this awesome video: [X rail doesn't sit flush](https://forum.onefinitycnc.com/t/x-rail-doesnt-sit-flush/6180) (was really easy)
- One of my combination squares isn’t square!  
– Used this to check: [https://www.youtube.com/watch?v=W-\_6r7Rzqm8](https://www.youtube.com/watch?v=W-_6r7Rzqm8)

### 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 @349iq2345, @TheyCallMeJohn, @TMToronto

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