Often while making work there is a need to fabricate or customize a tool. In my previous post I mentioned the need of a curved sole hand plane, well here they are. I decided to make two different ones knowing they would both get used. The larger plane is curved across its width where the smaller plane is curved both in its width and length. The smaller, compass plane allows me to create compound surfaces much easier, such as the back and seat of my "
Sapele Dining Chair".


I did not use any plans to make these, just a plane one of my peers had already made himself, using his construction as a starting point. They are quite simple to make, especially after you have made a few. There are two thinner side walls, a wider "infill" piece, and the sole.
I get all of my curved irons from
Hock Tools and always start with that plane Iron. You can choose any width or diameter iron you feel necessary and base both the width of the infill, and curve of the sole off it. Make sure to leave some extra width on your infill section to allow adjustment while planing. The infill section should be made up of one solid, long piece to start off. Once you have your pieces roughed out and in the square drill through holes to whatever diameter dowel you have. These dowels will be cut off after the glue up, so make sure to keep them towards the ends of the plane, but not too close to cause short grain. Next mark out, and cut your angles for the iron, this is the trickiest part to get perfect. The angles are a personal preference but keep the pitch of the iron around 45-55 degrees, and the other enough to clear chips. The difficulty in this is making sure these angels are far enough apart to leave clearance for the blade, as well as the shavings being cut. This is very difficult to do after the plane is glued together, so make sure to measure carefully and
don't forget about the addition of the sole. The sole will add material to the bottom and require a greater distance between the two angles. After this step your plane should look just like the drawing above.
Another, larger dowel will be placed near the center of the plane for a wedge to leverage the iron against the infill. This location needs to leave room for both the iron wedge. This hole can be drilled either before or after gluing the plane together. Now the plane gets glued together with the four locating dowels on the edges. Make sure to be generous with clamping pressure and try to stay neat where the iron will be.
Now join and plane it flat and you can start working on the sole of the plane. The sole needs to be a very dense and durable wood such as Bubinga or hornbeam. Place the still square sole under the plane to mark the opening and transfer your angles as well, so keep your bevel gauge set. Chisel out the opening maintaining your angles and it should be ready to glue. The sole can be chiseled close and finalized once it is glued on. You should not have cut any profiles at this point as it will make the sole difficult to glue on.

Once your sole is glued hand plane it to the curve of the blade
. This curve will not be the radius of the iron, it will be whatever that radius is while rotated at the angel of the infill.
You should wait until the very last minute to sand the sole if at all, otherwise your sole will not be flat and will not maintain a consistent radius. If you have a CNC router this process can easily be more accurate as well. Now you can flush any unfinished edges and cut the profiles.
The wedge should be a low angle otherwise it will not stay in place, but not too low where it will pop out unexpectedly (think of this similar to a door stop). Also make your wedge out of a hard, dense material so it can withstand the pressure. A nice additional touch is to add or inset metal into the back of the plane. This will prevent damage when you knock the iron out with a hammer.
That's it, your ready to plane!! Don't forget it will inevitably take a few more tweaks to get everything fine tuned, the rest is for you to customize and finish as you would like.