Corner post dovetails - technique problem?

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Forum topic by jonlan posted 05-06-2016 02:13 PM 909 views 0 times favorited 1 reply Add to Favorites Watch
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72 posts in 2179 days

05-06-2016 02:13 PM

I recently bought an Incra LS positioner router system and have been very happy wth it. After trying many other joinery options on the Incra I decided to try out corner post dovetails. Things were going well until I had to cut the dovetail grooves down the length of an 8 inch board. Im running into two problems…

1 – The bit grabs the edge of the board. Each time I start pushing through to cut the groove the bit grabs the board, sometimes quite violently. It sort of scared me the first couple of times it did it. If I go super slow, it helps, but it still grabs. Is there something I could do to help with that?

2 – I just cant seem to get the grooves straight. I thought at first it was because saw dust was get bound up in the cutter about half way through the board so I started doing the cuts in smaller pieces where I’d back out to clear the dust, do another inch, and repeat until I got all the way through. The results are still off. So its almost like its still grabbing even when Im cutting the groove.

Couple of things I was thinking. Maybe the bit? Literally a brand new whiteside bit that has never been used before this and it works flawlessly when Im cutting the other end joints. Then I was thinking the speed of the router. The router is a Porter Cable 7518 and I have it on the second to lowest speed which seems to work well. Increasing the speed seems to make things worse.

Im at a bit of a loss. Any tips that might help me out here?

1 reply so far

View abie's profile


927 posts in 5063 days

#1 posted 05-06-2016 02:25 PM

I have not used mine in a year but I suggest you view all the youtube videos that Incra has produced.
Perhaps you need somemthing to hold your board firm to the table while cutting your grooves.
Good luck

-- Bruce. a mind is like a book it is only useful when open.

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