If you are getting unexpected, deep cuts, it's likely that the end mill is coming loose. There are two causes for this:
- The end mill isn't seated properly in the collet adapter.
- It's slipping since the feed/speed combination is too aggressive.
To solve the first, remove the nut at the bottom of the router along with the rest of the assembly and make sure that everything is fitting together like this:
Put the above assembly back into the router and fix into place with the collet nut. Cutting should now go as expected. If this isn't fixing the problem then it means you've told the Mill One to cut much faster than it's supposed to. When the machine is pushing the rotating bit really hard into the material, it forced the bit out of the router. Refer to our Speeds and Feeds page to adjust as necessary. Otherwise, send us an email and we'll be sure to help you out.