When I got up on Saturday morning, I knew there was a huge possibility that in the shop I wouldn’t be doing what I planned. I was going in to spray the final coat of shellac onto my clocks; I’m looking to darken the overall appearance just a shade more. The humidity was high which means that there was a chance for the finish to blush, or turn cottony white with moisture trapped in the finish.
Instead, I decided to work on the backboards for the two clocks. On most antique clocks, the backs run top to bottom and are not attached to the hoods, so the hood can be removed. The stacked series of three photos at the left show a typical clock back (click on the image to make it bigger).
Generally you see a main board that runs the full length with ears attached at the base and hood areas. That requires a board or panel that’s 90″ in length and 15″ wide. I could have done that – may due it if John and Joe (brothers for which I’m building this clock) want to go with the antique design.
The second clock, however, is for me (at least at this time), so I’m going at it differently. I’m running the boards across the back from the bottom up about 50″ just as would be seen on a case piece of furniture. I then plan to turn the upper board so its grain runs vertical. To make the transition, I’m using a tongue-and-groove joint. It’s a bit more work and will need a few additional fasteners (nails I suspect), but I can use short pieces of scrap cut off from other projects. Frugal, huh!
To make this happen, I first added a shiplap cut to each of the milled, over-long, random-width boards selected for the back. I began at the bottom – the bottom board was cut on only one edge. From there to the 50″ mark (it doesn’t have to be that length, it’s just what I chose based on the number of pieces I had to use and the width of those pieces), I fit and positioned each board. The top board – also shiplapped on one edge – was taken back to the tablesaw for the tongue portion of the transition joint. I then slipped the top horizontal board in place and added a couple of clamps to hold things secure.
I had to get the final length measurement of the vertical board, so I had to stand the case upright and add the hood. With that measurement in hand, I cut the groove portion along the bottom edge of the panel, and laid out the exact spot where the back needed to step out to fill in the extra width of the hood.
Because the glued-up panel had set in the shop for some time,there was a small amount of warp I had to deal with. Here’s a great shop tip: To straighten out the panel, I clamped a straight piece of stock across the panel width keeping the clamps above the height of my saw fence, then made the cuts needed to form the groove.
The ears were cut at my band saw, then trimmed to length at the bench using my handsaw. To final check and tweak the fit, I joined the tongue and groove, then slide the assembly into position. Below you can see how the transition works. Because the top panel extends down the clock’s case, there are more than enough places for fasteners. This setup should work great.
Build Something Great!