# Tramming Discrepancy

**URL:** <https://forum.onefinitycnc.com/t/tramming-discrepancy/24070>\
**Category:** Uncategorized\
**Created:** [December 18, 2023, 5:05pm UTC](https://forum.onefinitycnc.com/t/tramming-discrepancy/24070 "2023-12-18T17:05:29Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![349iq2345](https://avatars.discourse-cdn.com/v4/letter/3/bb73d2/32.png) [@349iq2345](https://forum.onefinitycnc.com/u/349iq2345)\
**Post date:** [December 18, 2023, 7:34pm UTC](https://forum.onefinitycnc.com/t/tramming-discrepancy/24070/5 "2023-12-18T19:34:28Z")

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Hey Erik,

the [Mitz Pellicciotta method](https://www.youtube.com/watch?v=GVpq96KFfvk), which is a method that works the better the larger the bit diameter is, because it looks at the direction of the patterns such a bit makes when it is not perpendicular to wasteboard surface, works only as **third step** after you ensured your machine is

1. [**rectangular** (“squared”) (_bar gauge_) and 2. **coplanar** (“not twisted”) (_fishing line method_)](https://forum.onefinitycnc.com/t/what-do-i-do-first/18349/6).

Only then I would proceed with

1. [**Tramming the router** (Checking for perpendicularity between milling motor axis and (different areas of) worksurface)](https://forum.onefinitycnc.com/t/tramming-the-router/1132/97)

IMPORTANT NOTE: Surfacing the wasteboard **does help nothing** if the machine is not accurately rectangular (“squared”) and coplanar (not twisted)! Not at all! All your workpieces including the wasteboard will remain a parallelogram and be twisted if you don’t ensured steps 1 and 2 accurately.

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