Bistro Table, Part 4: Making the Top-Support Ring

The table will eventually look like this:

Sketchup mockup

The top slats for this table will be supported by a center round piece as well as by a ring that rests on the base.

View from below showing the ring that supports the top slats

Today's post will be about making these two support pieces and will be mostly pictorial.  Lots o' pics!

Started with a full scale drawing of the ring - 23 1/2" outer diameter

Detail view on one component of the 8-piece ring

Originally I thought I might use splines to connect the parts, but I went with integral tenons on one end and mortises on the other end of each piece.

Took dimensions from the drawing, squared up some pieces and marked where things will go

After a couple successful test pieces, ganged up the rest and marked edges together

Transferred angles to faces and then to other edge

Marked to make absolutely certain of no mistakes

Making the tenons

Sawed off the waste end

Marked the tenon extents using a router plane as marking gauge

Sawed the shoulder, which was 3/4" from the end

Split off as much as I could safely do

Pared close to the line

Then used the router with unchanged setting to get exactly to the lines

Cleaned up the shoulders with a sharp chisel

Rinse and repeat for the rest of the pieces

Making the mortises

First, removed the waste

Then carefully squared the end

That's what Daddy likes!  This is important for a good joint.

Before going further, numbered the joints (even though they were fairly interchangeable)

Made a knife nick on the corner 3/4" from end to mark the depth of the mortise,
transferred nick marks to other corner with bevel gauge and squared lines onto the edges in mortise area

Used same router setting as before to mark the mortise

Sawed close to the lines

Left the lines

After chiseling out the waste, pared closer to the lines.
Tested the fit of the tenon, and pared more until the fit was right

Fitting them together

After all eight pieces were done, I tested the fit by assembling two sections of four pieces each.

Two half-rings dry-assembled with tight joint lines

Then carefully fit the halves together to see what kind of adjustments would need to be made.

Left side: gap on the inside

Right side: gap on the inside

This meant I needed to shave a little off every piece and it's easiest to do that on the mortise end.  I freehanded the cut on a shooting board, taking a bit off the outside half of each mortise end.

Probably should have made a special shooting board for this, but this worked

Got a nice fit after only one iteration of this

With the parts dry fit, I marked out the circles and then did the shaping.

Marked the outer circle with large homemade compass

Didn't get pics of the shaping, but it went off easily

After shaping, the joints looked like this on the outside ...

... and this on the inside.  I glued in small off-cuts from the tenons to fill these gaps.

Glued up using a ratchet strap, which pulled the joints together nicely.
Clamps and holdfasts kept the ring from twisting while the glue set.

And there it is.

Not perfectly round, but it doesn't need to be.

As for the circle part in the center of the sub-top, that also went well.

6" x 6" x 5/8" thick blank, squared and marked

Sawed the bulk of waste off

Then used chisel, spokeshave and file to complete the shaping and smoothing.  Came out nice.
I also made a 4" round piece from redwood that will be the center of the top.

Next time: Making the top slats and bringing it all together.