# 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:** 1

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**Author:** ![ConvenientWoodwork](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/convenientwoodwork/32/22558_2.png) [@ConvenientWoodwork](https://forum.onefinitycnc.com/u/ConvenientWoodwork)\
**Post date:** [June 12, 2021, 6:58pm UTC](https://forum.onefinitycnc.com/t/is-your-router-frame-a-parallelogram-mine-was/6086/1 "2021-06-12T18:58:58Z")

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![Trapezoid Square Parallelogram](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/3X/c/e/ce5e56a4be576918b78e7759b22c3f5049bc319d.jpeg)  
 ![Measure diagonal of a square](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/3X/b/c/bc58f8a76ada8ed42c1736e66dabd1c27e5cff3c.jpeg)

I’m on day 2 of CNC setup and I just discovered something that I do not recall seeing on this forum so I thought I’d share.

I mounted my machine per the instructions in the manual and YouTube video and it seemed to go well. Everything was jogging smoothly and no binding was evident. I expect most other people have the same experience (good job on design Onefinity!).

I was in process of making my spoilboard (t-nuts) and got ahead of myself. I mounted the board to the table and surfaced it, trammed the router ([my tramming jig](https://forum.onefinitycnc.com/t/tramming-the-router/1132/47)) and surfaced it again 90 deg to the first pass. It came out lovely…and then I remembered the counterbores for the t-nuts need to be made on the other side 🤦‍♂️

I figured it would be best to fixture the spoilboard in some way before I flipped it so I zeroed the X axis at 408mm (centerline) and offset +/-395mm to bore some fixturing holes. I did this at the full Y extents front and back. So now I’ve got 4 holes, one at each corner of my spoilboard. If everything is square and true I should flip the spoilboard over and all holes will line up…as you may have guessed from the post title, it didn’t. The holes at the front of the machine and the holes at the back lined up independently but not together. When I pinned the front holes the back were shifted almost exactly 0.100".

I luckily had some wiggle room in the way I mounted the rails and was able to slide the back of the machine over by 0.050" and now I have a square machine!

I hope this may help someone else! I can share pictures if it helps explain things.

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