WorkBench - workbench.pdf

(934 KB) Pobierz
678668915 UNPDF
$175 Workbench
For $175 you can build a
bench that will retire after
you do.
I’ve hauled my grandfather’s
workbench across snow-covered
Appalachian mountains, down
narrow stairwells and into a dirt-
floored garage that should have
been torn down during the
Eisenhower administration. I’ve
built a lot of good stuff on that
bench, but now it’s time to retire
the old horse. For starters, the
bench is too low for the way I
work. And the top is pockmarked
When you glue up your top, you want
to make sure all the boards line up.
Lay down your glue and then clamp up one
end with the boards perfectly flush. Then
get a friend to clamp a handscrew on the
seam and twist until the boards are flush.
Continue clamping up towards your friend,
having your friend adjust the handscrews
as needed after each clamp is cinched
down.
678668915.036.png 678668915.037.png 678668915.038.png 678668915.039.png 678668915.001.png 678668915.002.png 678668915.003.png 678668915.004.png 678668915.005.png 678668915.006.png 678668915.007.png 678668915.008.png 678668915.009.png 678668915.010.png 678668915.011.png 678668915.012.png 678668915.013.png 678668915.014.png 678668915.015.png 678668915.016.png 678668915.017.png 678668915.018.png 678668915.019.png 678668915.020.png 678668915.021.png 678668915.022.png 678668915.023.png 678668915.024.png 678668915.025.png
with three different shapes and
sizes of dog holes. And during
the last few years I’ve become
fed up with the tool tray. The
only thing it seems designed to
hold is enough sawdust for a
family of gerbils. So I need a
new bench, but there’s no way
I’m going to spend $1,200 to
$1,400 for a high-quality bench
from Hoffman & Hammer or
Ulmia.
Enter Bob Key from Georgia. He
and his son have been building
benches using off-the-rack pine
for a few years and have even
built a website showing how
quick and easy this is to do (visit
them at
www.mindspring.com/~bobkey/
beginners.htm). I was impressed
with their idea. So I spent a
week reading every book on
benches I could find. I pored
over the woodworking catalogs.
And after a lot of figuring I came
up with a simple plan: Build a
bench for less than $175.
Drilling the 3/8" holes for the bolts is
easier if you do it in this order. First
drill the holes in the legs using your drill
press. Now assemble the leg and front rail.
Drill into the rail using the hole in the leg as
a guide. Remove the leg from the rail and
continue drilling the hole in the rail. The
hole you drilled before will once more act as
a guide. You still need to be careful and
guide your drill straight and true.
Believe it or not, I came in 92
cents under budget and ended
up with a bench that is tough,
sturdy and darn versatile. I made
a few compromises when
choosing the hardware to keep
the cost down, but I designed
the bench so that it can later be
upgraded with a nice tail vise.
However, I made no
compromises in the construction
of the top or base. You can
dance on this bench.
Another illustration of step 2.
Let’s Go Shopping
OK friends, it’s time to make
your shopping list. First a word
about the wood. I priced my
lumber from a local Lowe’s. It
was tagged as Southern yellow
pine, appearance-grade. Unlike
a lot of dimensional stock, this
stuff is pretty dry and knot-free.
Even so, take your time and pick
through the store’s pile of 12-
foot-long 2 x 8s with care to get
the best ones possible. You can
hide a few tight knots in the top,
but with luck you won’t have to.
After you cut your tenons, lay them
directly on your work and use the
edges like a ruler to mark where the
mortise should start and end (this picture).
Use a 1" Forstner bit in your drill press
to cut overlapping holes to make your
mortise (step 5).
678668915.026.png 678668915.027.png 678668915.028.png 678668915.029.png 678668915.030.png
Here’s the story on the
hardware. The bolts, nuts and
washers are used to connect the
front rails to the two ends of the
bench. Using this hardware,
we’ll borrow a technique used by
bed makers to build a joint that
is stronger than any mortise and
tenon. The Bench Dog and
Wonder Dog will keep you from
having to buy an expensive tail
vise. Using these two simple
pieces of hardware, you can
clamp almost anything to your
bench for planing, sanding and
chopping. The traditional face
vise goes on the front of your
bench and is useful for joinery
and opening cans of peanut
butter.
Now square up the edges of the
mortise using a mortise chisel and a
small mallet (step 6).
Preparing Your Lumber
Cut your lumber to length.
You’ve probably noticed that
your wood has rounded corners
and the faces are probably less
than glass-smooth. Your first
task is to use your jointer and
planer to remove those rounded
edges and get all your lumber
down to 1-3/8" thick.
The mortises in the front rails are also
made on the drill press. Make them 1-
¼" deep to make sure you can get a
washer in there. If you can’t, try clipping an
edge off of the washer.
Once your lumber is
thicknessed, start working on
the top. If this is your first
bench, you can make the top,
then throw it up on sawhorses to
build the base. The top is made
from 1-3/8" x 3-3/8" x 70"
boards turned on edge and
glued face-to-face. It will take
five of your 2 x 8s to make the
top. Build the top in stages to
make the task more
manageable. Glue up a few
boards, then run the assembly
through the jointer and planer to
get them flat. Make a few more
assemblies like this, then glue
all the assemblies together into
one big top.
Drilling your dog holes may seem like
hard work using a brace and bit. It is.
However, you get an amazing amount of
torque this way — far more than you can
get with a cordless drill. Sadly, I had
cooked my corded drill, so this was my only
option.
When you finally glue up the
whole top, you want to make
sure you keep all the boards in
line. This will save you hours of
flattening the top later with a
hand plane. See the photo
above for a life-saving tip when
you get to this point. After the
678668915.031.png 678668915.032.png 678668915.033.png
glue is dry, square the ends of
your assembled top. If you don’t
have a huge sliding table on
your table saw, try cutting the
ends square using a circular saw
(the top is so thick you’ll have to
make a cut from both sides). Or
you can use a hand saw and a
piece of scrap wood clamped
across the end as a guide.
Build the Base
The base is constructed using
mortise-and-tenon joinery.
Essentially, the base has two
end assemblies that are joined
by two rails. The end assemblies
are built using big 1"-thick, 2"-
long tenons. The front rails are
attached to the ends using 1" x
1" mortise-and-tenon joints and
the 6"-long bolts. Begin working
on the base by cutting all your
pieces to size. The 2¾"-square
legs are made from two pieces
of pine laminated together. Glue
and clamp the legs and set them
aside. Now turn your attention
to cutting the tenons on the
rails. It’s a good idea to first
make a “test” mortise in a piece
of scrap so you can fit your
tenons as they are made. I like
to make my tenons on the table
saw using a dado stack. Place
your rails face down on your
table saw and use a miter gauge
to nibble away at the rails until
the tenons are the right size.
Because pine is soft, be sure to
make the shoulders on the
edges 1" wide on the upper side
rails. This precaution will prevent
your tenons from blowing out
the top of your legs.
Now use your tenons to lay out
the locations of your mortises.
See the photo at right for how
this works. Clamp a piece of
scrap to your drill press to act as
a fence and chain-drill the
mortises in the legs. Make your
mortises about 1/16" deeper
than your tenons are long. This
will give you a little space for
any excess glue.
Once you’ve got your mortises
drilled, use a mortise chisel to
678668915.034.png
square the round corners. Make
sure your tenons fit, then dry-fit
your base. Label each joint so
you can reassemble the bench
later.
Bed Bolts
There’s a bit of a trick to joining
the front rails to the legs.
Workbenches, you see, are
subject to a lot of racking back
and forth. A plain old mortise-
and-tenon joint just won’t hack
it. So we bolt it. First study the
diagram at left to see how these
joints work. Now here’s the best
way to make them.
First chuck a 1" Forstner bit in
your drill press to cut the
countersink in the legs for the
bolt head. Drill the countersinks,
then chuck a 3/8"-brad-point bit
in your drill press and drill in the
center of the counterbore
through the leg and into the
mortise.
Now fit the front rails into the leg
mortises. Chuck that 3/8" bit into
your hand drill and drill as
deeply as you can through the
leg and into the rail. The hole in
the leg will guide the bit as it
cuts into the rail. Then remove
the leg and drill the 3/8" hole
even deeper. You probably will
have to use an extra-long drill
bit for this.
OK, here’s the critical part. Now
you need to cut two small
mortises on each rail. These
mortises will hold a nut and a
washer and must intersect the
3/8" holes you just drilled. With
the leg and rail assembled,
carefully figure out where the
mortises need to go. Drill the
mortises in the rails as shown in
the photo. Now test your
assembly. Thread the joint with
the bolt, two washers and a nut.
Use a ratchet and wrench to pull
everything tight. If your bench
ever wobbles in your lifetime, it’s
probably going to be a simple
matter of tightening these bolts
to fix the problem. Remember to
tell this to your children.
678668915.035.png
Zgłoś jeśli naruszono regulamin