V bit moving away from the initial line


I’m fairly new to the CNC world. I’ve been getting wonky lines when I Vee carve letters (please see attached image, mainly the top bar of the “T”).
The router moves a few degrees when plunging into the wood.

I’m using CC and CM for all my carvings. A 60 Degree V bit and use the feeds and speeds recommended by CC. I tried slowing the plunging down but still get crooked lines. Any ideas why this is happening?

Thank you.

Please check your machine mechanically :

​ It is also important to be sure that the collet is correctly tightened, the endmill fits correctly and doesn’t slip, and the router is mounted securely in the mount, and that the mount doesn’t shift. Note than endmill pullout can happen gradually, especially when profiling against tall walls.[4]

The router speed setting should match the feeds and speeds for your selection of endmill and material. Please see:

(there’s a row matching dial settings to RPMs at the bottom)

There’s an interactive version at: https://public.tableau.com/profile/willadams#!/vizhome/Carbide3DCNCFeedsandSpeeds/Sheet1?publish=yes

See https://www.youtube.com/watch?v=S9bceJxpqG0 for concepts on this and see the series #MaterialMonday: #MaterialMonday on YouTube for specifics.

You should test feeds and speeds in a piece of scrap using the technique at: https://precisebits.com/tutorials/calibrating_feeds_n_speeds.htm

Another consideration is Climb vs. Conventional Milling and tooling engagement — where possible avoid slotting and add geometry and cut as a pocket (Adding geometry to cut as a pocket with a finishing pass ).

Beyond that it’s usually a matter of ​Calibration and Squaring the Machine c.f., http://docs.carbide3d.com/shapeoko-faq/how-to-calibrate-the-machine-for-belt-stretch/


Thank you Will! I think I need to tighten the eccentric nuts. I appreciate all the info!


There’s the hint…that shouldn’t happen…


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