Preventing plunge router circle marks

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Forum topic by woodworker33 posted 09-20-2014 05:45 AM 1118 views 0 times favorited 4 replies Add to Favorites Watch
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22 posts in 1499 days

09-20-2014 05:45 AM

I’m using a straight router bit and a template to hollow out a wood block. However, always on the last plunge down it makes a circle cut mark. Is there a technique to avoid this from happening? I’m using a Dewalt 618 router, if that matters.


4 replies so far

View InstantSiv's profile


262 posts in 1557 days

#1 posted 09-20-2014 11:22 AM

Move the router while you plunge.

View Gene Howe's profile

Gene Howe

10341 posts in 3390 days

#2 posted 09-20-2014 11:42 AM

Use a dish/Bowl bit.

-- Gene 'The true soldier fights not because he hates what is in front of him, but because he loves what is behind him.' G. K. Chesterton

View Picklehead's profile


1041 posts in 1891 days

#3 posted 09-20-2014 11:57 AM

After that “last plunge”, lower the bit a fraction more, lock the plunge mechanism, and make a clean sweep of the entire routed area.

-- You've got to be smarter than the tree.

View Slemi's profile


116 posts in 1503 days

#4 posted 09-21-2014 06:23 AM

I would say that your router base is not fixed enough and You move it a little to deep when You press it down to make final pass. Have two 1/8” shims, made of wood of course, at hand when You hollow pieces and then just before You plunge to final dimension put shims between router base and the working piece and plounge router to final dimension and when You have the final dimension set, take out shims and do your final pass.

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