Router, planer sled, problems

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Forum topic by skier1 posted 05-19-2017 05:52 PM 1065 views 0 times favorited 4 replies Add to Favorites Watch
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1 post in 984 days

05-19-2017 05:52 PM

I’m getting a washboard effect when trying to flatten a board. I’s worse going crossgrain. Tried taking just a small amount, same effect. Any ideas?

4 replies so far

View TungOil's profile


1372 posts in 1106 days

#1 posted 05-19-2017 06:09 PM

I’m not clear on what you are trying to do from your post above. If you can you post a picture of what your setup looks like, perhaps someone can help.

-- The optimist says "the glass is half full". The pessimist says "the glass is half empty". The engineer says "the glass is twice as big as it needs to be"

View bbasiaga's profile


1243 posts in 2607 days

#2 posted 05-19-2017 06:35 PM

I think you are trying to flatten a board using a router sled for planing.

If so, I would say to make sure each pass overlaps the last by 50% or so. That is, if you use a 1” bit move the sled forward a haf inch at a time.

You should also check that the router is flat in the sled. If it tips slightly forward you may be creating a sloped cut.

Finally I would say not to expect a super smooth finish from the router bit. The grain can be disturbed in swirl marks from the rotation of the blade, and there can be tool marks left over as well. My Douglas fir workbench top looks like it is washboarded, but if you run your hand down it it is smooth. It’s just how the grain is laying from the router passes.


-- Part of engineering is to know when to put your calculator down and pick up your tools.

View runswithscissors's profile


3081 posts in 2637 days

#3 posted 05-20-2017 03:07 AM

A dish cutting router bit can help. They have slightly rounded corners, so a ridge is less likely to form.

-- I admit to being an adrenaline junky; fortunately, I'm very easily frightened

View Woodknack's profile


13027 posts in 2992 days

#4 posted 05-20-2017 03:25 AM

Be more specific about the equipment and setup, preferably include pics (hopefully right side up), otherwise everyone is just shooting in the dark. For what it’s worth, my guess is vibration. Your setup isn’t rigid enough.

-- Rick M,

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