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Joining curved seams

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Forum topic by giser3546 posted 05-23-2014 02:34 PM 827 views 0 times favorited 10 replies Add to Favorites Watch
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giser3546

179 posts in 937 days


05-23-2014 02:34 PM

I have glued up dozens of wide panels. A hand plane and a combination square make short work of it and its one of the things I can make that consistently look very good. I am wondering however how to do this same thing without making the seams straight. Two curved surfaces that can me joined and match up PERFECTLY has proven difficult for me. I’m pretty sure the process would involve a flush trim bit but somehow getting a cut that is the exact negative of another curved surface. Anyone know a good youtube video or how to guide that could walk me through this process?

-- "If you wait for it to rain, It will"


10 replies so far

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shipwright

7173 posts in 2263 days


#1 posted 05-23-2014 02:48 PM

Sounds like you want to do it with a router. If so, an inlay bushing set will get it done with a perfect fit.
Here’s an example of a project with a very curvy joint done that way

This tutorial covers the whole project. There are lots of photos but the router cutting stuff is about in the middle.

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fibreglass trees. http://thecanadianschooloffrenchmarquetry.com/

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giser3546

179 posts in 937 days


#2 posted 05-23-2014 02:54 PM

Much appreciated shipwright, I mentioned doing it with a router because I couldn’t think of another way to do it. I do usually try to use my hand tools as much as possible but couldn’t think of a reliable way to do it. What are some other methods?

-- "If you wait for it to rain, It will"

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Loren

8309 posts in 3113 days


#3 posted 05-23-2014 03:06 PM

In one of James Krenov’s books he describes doing it with
hand planes. He found it tricky.

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giser3546

179 posts in 937 days


#4 posted 05-23-2014 03:18 PM

How would you do an concave curve with a hand plane?

-- "If you wait for it to rain, It will"

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Loren

8309 posts in 3113 days


#5 posted 05-23-2014 03:21 PM

You’d make special planes.

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giser3546

179 posts in 937 days


#6 posted 05-23-2014 03:26 PM

Ah, and thus the trickiness of it I assume.

-- "If you wait for it to rain, It will"

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jdh122

879 posts in 2283 days


#7 posted 05-23-2014 03:36 PM

The Krenov description mentioned by Loren is in The Impractical Cabinetmaker. You could do it with special hand-made planes or use an adjustable curved-bottom metal plane. The trickiness is less the fact that you need special planes and more in simply getting the two arcs to match up. Even though I dislike routers and look for alternative ways to do just about everything, I’d hesitate trying to do this by hand.

Krenov: “I planed them together with the help of one of my curved planes. And I tell you, I’m not at all sure I want to do that again! It took about a day and a half… I’d get it almost right, and then maybe take just one little stroke of the plane too much somewhere and spoil it, and then I’d have to start all over again.” (p.75 in my copy)

-- Jeremy, in the Acadian forests

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Loren

8309 posts in 3113 days


#8 posted 05-23-2014 03:38 PM

It’s using compass planes to get matched glue joint that
is likely to be tricky. I think he already had the planes.
They aren’t that hard to make. You can buy an
adjustable compass plane – I’ve used a couple and
never got the hang of making a smooth cut with one.

You can also get wood compass planes from Lee Valley,
ebay, the Japan Woodworker.

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giser3546

179 posts in 937 days


#9 posted 05-23-2014 03:54 PM

Yea, I believe this will be a situation where I use my router in then name of making something and not using tools.

-- "If you wait for it to rain, It will"

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shipwright

7173 posts in 2263 days


#10 posted 05-23-2014 04:53 PM

The other way is to stack cut on a scroll saw (or band saw for less dramatic curves) in double bevel style.
Again, the fit will be perfect. This blog describes the theory (although in veneer stock). The same idea works in thicker stock but the saw angle will be much closer to square.

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fibreglass trees. http://thecanadianschooloffrenchmarquetry.com/

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