AW Extra 6/20/13 – Garden Bench

Garden Bench

Graceful, comfortable and built to last

by Luke Hartle

It dawned on me the other day that every single project I’ve made
resides in my house. Since I spend a lot of time in my back yard
garden, I decided it was high time I made something to enjoy in my
outdoor living space as well. This backless bench is the perfect
project. The bench is now the centerpiece of my yard. Stout
mortise-and-tenon joinery and naturally rot-resistant mahogany ensure
that it will retain its exalted position for years to come

Traditional joinery holds the framework together; the seat slats are
secured with a newer joinery technique, the Miller Dowel system (see
“Miller Dowel Joinery System,” below). The bench seemed to be the
perfect project on which to try these high-tech dowels. I really liked
how quick and easy they were to use compared with the traditional
screw-and-plug approach.

 

Assembly Steps

1. Mill all pieces to their final dimensions, except for the spreaders (D) and brace (F).

2. Make a template (Fig. B, page 66) to route the mortises.

3. It’s easy to end up with misplaced mortises. To avoid mistakes,
label each leg as front or back, left or right (Fig. A, page 66). Use
the
template to lay out the mortises.

4. Drill out the mortises on the drill press.

5. Rout the mortises in the bench legs (Photo 1).

6. Use a chisel to square the mortise’s corners (Photo 2). Do this
right after you rout each mortise to avoid having to reposition the
template.

7. Rout the tenons on the long rails (B) seat rails (C) and the
lower rails (E) (Photo 3). Use a large-diameter straight-cut bit for a
smooth cut. Rout the tenons on all the long and seat rails before
routing the lower rails so you only have to change your setup once.

8. Use the dovetail jig (Fig. C, below) to rout the stopped-dovetail
grooves in the long rails (Photo 4). Match the centerline of the socket
with the centerline on the jig. Clamp everything firmly to the
workbench.

9. Insert the stop block in the jig and rout the dovetail sockets in the lower rails.

10. Rough-cut the seat template pattern (Fig. D, page 68) on the bandsaw and sand smooth.

11. Rough cut the curves in the seat rails on the bandsaw. Finish the profile with the seat template and a pattern-cutting bit (Photo 5). Center the template on the rail with the back edges flush.

12. Sand all the parts to 180 grit.

13. Glue the bench frame in stages, using a waerproof glue, such as
Titebond II or III. Assemble the legs, seat rails and lower rails first
to create an end assembly. Then join the end assemblies with the long
rails (Photo 6).

14. Determine the exact length of the seat spreader (D) by measuring
the distance between the long rails where they join the legs and adding
the length of each dovetail. Cut the spreaders to length. Measuring
near the legs rather than in the dovetail grooves eliminates measuring
any slight bow in the long rails.

15. Measure and cut the brace (F) to length.

16. Route the tails of the dovetails on the seat spreaders and on
the brace (Photo 7). Run a few test cuts on scrap lumber to get the
perfect fit.

17. Use a handsaw to notch each tail so they are about 1/8 in. shorter than the sockets.

18. Rout the curves in the spreaders, as done on the seat rails in
Step 11. Make sure to use the centerline for reference. Unlike the
rails, the spreaders will have short flats on each end of the curve
(Fig. A, below).

19. Sand the seat spreaders and the brace.

20. Glue in the spreaders (Photo 8). Then, flip the bench and add the brace.

21. Shape the seat slats on the router table with a 1/4-in. round-over bit.

22. Lay out all dowel locations on the seat slats (Fig. A).

23. Attach the seat slats to the bench (Photo 9). First clamp an
outside slat so it overhangs the leg by 1/8 in. Run the drill at the
maximum rpm level with a slow feed rate to prevent tearout around the
hole.

24. Use a framing square to keep the slats’ ends aligned.

25. Trim the dowel heads with a flush-cut saw.

26. Sand the slats to 180 grit.

27. Finish the bench with an outdoor finish to preserve its color
and appearance or skip the finish and let it age naturally to a
silver-gray color.

 

Sources

Source information may have changed since the original publication date.

Steve Wall Lumber Co., walllumber.com, 800-633-4062, Select
4/4 mahogany, $4.30 a bd. ft.; Select 8/4 mahogany, $4.60 a bd. ft.

Miller Dowel Co., millerdowel.com, 866-966-3734, 1X Miller
TruFit drill bit, $18; 1X mahogany Miller dowels, 100-count bag, $35.

Rockler, rockler.com, 800-279-4441,   5/8-in.-dia. x 14-degree dovetail bit, #91034, $13.

Woodworker’s Supply, woodworker.com, 800-645-9292, 3/4-in. double-flute straight bit, #04-140, $17.

Amana Tool, amanatool.com , 800-445-0077,  1/2-in.-dia. x1-in.
flush-trim template bit with upper ball bearing, #45460, $23;
1/2-in.-dia. x 1-1/2-in. flush-trim bit, #47124, $25.

Click on any image to see a larger version.

1. Mortise-and-tenon joinery makes this bench strong and
durable. Rout the mortises in the legs using a template and a
top-bearing pattern bit. The bulk of the material has already been
removed on the drill press.

 

2. Square the corners of the mortise with a chisel before
removing the template. The template serves as a guide to square the
corners and ensure a perpendicular cut.

 

3. Cut the tenons on the rails with a 3/4-in.-dia. straight
bit. A plywood sled with an attached hardwood fence ensures the
shoulders of the tenon are cut square and keeps your hands away from
the spinning bit.

 

4. Rout the stopped-dovetail sockets for the seat supports
using a simple shop-made jig. Clamp the jig to the stock and the
workbench. Add a stop-block to the jig to cut the shorter sockets for
the brace in the lower rails.

 

5. Rout the curve in the seat rails and spreaders using a
template. Center the template on the rail and secure it with
double-sided tape. Climb-cut the last portion of the curve first to
prevent tearout.

 

6. Glue the long rails to the assembled end frames. Keep the
dovetail groove opening faceup (that is, down on the bench) on the long
rails. The grooves on the lower rails face the opposite direction to
hide the dovetail joint.

 

7. Rout the tails on the ends of the brace and the seat
spreaders. Stabilize the stock using a push block with a slide
attached. Fasten the slide so it runs along the top of the fence. Clamp
the stock to the slide so it butts against the push block.

 

8. Glue the spreaders and the brace to the bench frame. Slide
the dovetails together by hand as far as possible. Use a rubber mallet
to tap the joint home. Alternate tapping each end to prevent binding.

 

9. Install the slats to the bench frame using Miller Dowels.
When the first board has been doweled, use a 1/4-in. spacer to set the
gap between the slats. Clamp the end of each slat as you drill and
dowel, working your way across the bench.

 

Miller Dowel Joinery System

The Miller Dowel system combines the strength of wood joinery
with the ease of a screw. Drill the hole, add the glue, tap the peg and
you’re finished. The secret to the dowel’s success lies in its stepped
design. The shoulder on the head of the dowel seats before the other
shoulders do, driving the parts together much like a nail does.
Horizontal ribs on the dowel absorb moisture from the glue, causing the
dowel to swell in the hole and lock in place. The head of the dowel
serves as a plug in the hole, but unlike traditional plugs, the Miller
Dowel leaves dark-looking end grain exposed for a decorative look after
the plug is sanded and finished

Miller Dowels are available in three sizes and a wide variety of
species. A companion stepped drill bit is specifically designed for
each size of dowel. (see Sources, above).

 

Cutting List

 

 

Figure A

 

Detail 1

 

Detail 2

 

This story originally appeared in American Woodworker Feb/Mar 2007, issue #127.

Buy this back issue.

Figure B

 

Figure C

 

Figure D