Bandsaw Circle Jig.pdf
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Band Saw
Circle Jig
© 2007 August Home Publishing Co.
J
igs
&
F
ixtures
B
and
s
aw
C
irCle
J
ig
Y
ou can cut circles on a band saw by simply
driving a nail into a piece of plywood and
using it as a pivot point. Or, you can build an
adjustable jig. This jig can be held to the table
with clamps or a unique turn button system.
BASE.
To build the jig, start by cutting a base
of
3
/
4
" plywood, 24" long, and 2" wider than
the depth of your band saw table, see Fig. 2.
TONGUE.
To form the sliding tongue that
holds the pivot nail, bevel rip a section out of
the center of the base.
BACKBOARD.
The outside two sections are
joined back together with a
3
/
4
" plywood back-
board, see Fig. 2. To determine its length,
lay the two outside sections together upside
down with the sliding tongue in place, and
measure across all three pieces.
Next, to determine its width, measure
across the front of your saw table and add
1
1
/
2
". Then draw a line across the three pieces
using this measurement, and cut the back-
board to width so it fits on this line.
Now, screw the backboard to the bottom of
the jig with the sliding tongue in place.
STOP SYSTEM.
The sliding tongue is held in the
correct position (depending on the radius to
be cut) with a thumb screw or studded knob
mounted in a threaded insert, see Fig. 1.
To install the insert, drill a counterbored
hole into the backboard, centered and near
the end of the tongue slot. Then install the
insert and thumb screw or knob. (Put a penny
in the counterbore to diffuse the pressure.)
PIVOT NAIL.
Next, drill a hole near the end of
the tongue, snip a 3d nail in half, and push it
into the hole as a pivot point, see Fig. 1.
BLOCKS.
You can clamp the jig to your band
saw’s table, or hold it in place with turn but-
tons. To attach turn buttons, cut two blocks
1
1
/
2
" wide and slightly less in thickness than
the saw table. Then, glue the blocks to the
bottom of the base, tight against the left end
of the table, see Fig. 3.
TURN BUTTONS.
To mount the jig to the table,
drill two counterbored holes for carriage
bolts, see Fig. 4. Then make two turn but-
tons to fit onto the bolts and use wing nuts or
knobs to tighten them down, see Fig. 5.
ALIGNMENT.
To align the jig for use, clamp it
down so the pivot nail aligns with the front of
the saw blade’s teeth.
1
DETAIL
Pivot
point
Sliding tongue
"
Counterbore,
" deep
#/4
Penny
Threaded
insert
!/8
Thumb screw
or studded
knob
Side of
band saw
Sliding
tongue
Turn button
holds jig
to band
saw table
Front of
band saw
#/4"
Plywood
backboard
Thumb screw holds
tongue in correct
position
2
Fasten backboard
to base with
screws or
nails and glue
#/4"
Bevel rip "
tongue from center
of
#/4
#/4"
plywood base
BOTTOM
SIDE UP
TOP SIDE
UP
90°
24"
#/4"
3
0°
Width
across
front of
band saw
table plus 1!/2"
#/4"
Tongue
must slide
smoothly
Side of
band saw table
plus 2"
SLIDING TONGUE
#/4"
3
4
1”-Dia.
counterbore,
" deep
5"
#/8
First,
clamp jig to
band saw table
so backboard
is touching
right edge
of table
Blocks
Second, glue
and clamp
block to
bottom of base
tight against
left edge of table
#/8"-Dia.
through hole
centered on
counterbore
3"
1!/2"
#/8" Carriage bolt.
Length may vary
1"-Dia. counterbore,
" deep
5
6
#/8
CROSS
SECTION
Table
Block
Block
Turn button
NOTE:
Block is
slightly thinner
than band saw
table thickness
Swing
turn button
to secure
jig to table
Wing nut
or knob,
and washer
Turn button
1
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© 2007 August Home Publishing Co. All Rights Reser ved.
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