September 9, 2010

Revisiting the use of a template to make a divider

Following the initial fit of the drawers, I want to re-visit how I went about making and fitting the divider rib shown in this photo (please bear with me, as I already described this process in an earlier article; however, the drawers were but a twinkle at that time). It is a simple process; and I keep this in mind as I approach making the drawer guides required to keep the drawers in place.

Critical layout using a large framing square is a must, to ensure proper alignment of the tapers on the side aprons with the taper on the divider. Now we can see the divider in the context of the drawer locations:

I suggest using the back of the back apron as the reference surface for the edge of the framing square, for best accuracy.

I made a template using ¼-inch plywood, carefully adjusting the length to the space from the back apron to the front apron. But, most importantly, to ensure proper alignment with the side aprons:

Fine tuning the angles became trivial, using a block plane, measuring, re-measuring, and measuring one more time:

Satisfied with the fit, I used the template to transfer the outline to the piece of quarter-sawn white oak that will become the divider:

Before cutting to the line on the band saw, I measured one more time:

I cut close to the line on the band saw, leaving the line. I then used the Krenov-style hand plane to trim to the line, for final fit:

Why did I use quarter sawn white oak for this divider? For the simple reason that the side aprons are also quarter sawn white oak, and I want the divider to move identically with changes in humidity. This is a design element that should ensure long-term flatness of the top.

But first I must tackle the 61-inch long stretcher between the legs; that will require mortises on the front-to-back stretchers, and tenons on the long stretcher. I will do this later today.

— Al Navas

The stand-up desk: Support for the top

With the dust cover now matching the drawer frame, I spent a little time today shaping the rib that will provide support to the heavy top. This rib also does double duty as an anchor for the top, to keep it flat; it will attach to the top using wood buttons inserted along the top edge of the rib, with screws securing the top.

The profile of the rib must match the flat surface, and also the 7° taper on the side aprons. I used one of the side aprons and transferred the profile to a piece of ¼-inch plywood; then I carefully cut close to the line on the band saw, and finally used a block plane to shave down to the line:

rib-planing

I wanted to size the rib such that the cross-grain wood movement will not pop the desk top out of position, or blow out the dust cover underneath; I calculated that 1/8-inch undersized (that is, shorter in height) will be quite adequate to account for wood movement, with a little to spare.

The following is the plywood template in place behind the center stile of the drawer frame:

rib-template-finished

Satisfied that the taper matched perfectly the taper of the side aprons, I now transfer the profile to the piece of quarter-sawn white oak that will be the rib:

rib-template-transfer

Then I make sure it will fit:

qswo-rib

Cutting close to the line on the band saw, I use the little Krenov-style hand plane I made, to size the rib to its final dimensions:

qswo-rib-planing-to-line

On the way back to the house, I realized I had not noticed the arrangement Sandy had made on the side of the new garden tool shed. I like it!

new-shed

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James Krenov, 1920-2009


Photo from the Krenov web site

James Krenov passed away yesterday. He was 89.

I invite you to read FineWoodworking.com’s tribute to the man, the legend; the article includes links to Fine Woodworking interviews, articles and video. Also, I suggest you read the blog entry at Popular Woodworking. It is a sad day, but I will always remember James Krenov.

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