Woodhaven 3210 Owner's Manual - page 2
BEFORE BEGINNING
Identify and verify that you have all the parts
listed. Read the instructions at least once, familiarizing
yourself with the parts before beginning. You'll
need a #2 Phillips screwdriver for assembly.
The Small Oval Jig is designed to be used with a stationary
belt or disk sander to sand the outside of ovals. It can be
used with an overarm pin router (only if it has a plunging
mechanism) to rout the inside and outside of ovals.
THE WORK TABLE
The Small Oval Jig needs a work table for the One Track
of the Small Oval Jig to ride in. We offer a Work Table (3215)
with a groove cut in it for this purpose. Otherwise make your
own work table approximately 12" x 24", with a 3/4" wide x 3/8"
groove cut across the center of the table in the short direction.
The groove should be just wide enough for the One Track to
slide easily but with very little slop, and deep enough so the
One Track is flush. The work table is clamped to the bench
or table of the tool that’s being used to machine the oval.
If you’re using a sander, place the work table about
1/4" away from the sanding surface. See fig. 1.
If you’re routing or drawing an oval,
see that section of the instructions.
PIVOT ASSEMBLY
Install a 1/8" Spacer (BUSH001) on both of the 3/4"
Thumb Screws (5505). Insert the Thumb Screws thru the
two holes in the 16" One Track and start 1/4-20 Oval Nuts
(5760B) on the ends of the thumb screws. See fig. 2.
Slide the 6" One Track (4206) on the oval nuts so
the end of it overhangs the end of the 16" One Track
(3210A) 1-3/4" and tighten the thumb screws.
Insert a 7/16" Screw (MP043) thru both of
the Pivots (3210P) and start a 10-24 Oval Nut
(5750B) on the end of each screw. See fig. 3.
Slide the Pivots into the open end of 16" One Track. Their
position on the One Track will depend on the size and differential
of the oval you need to make. Slide the 16" One Track into the
groove in the work table that’s clamped to the table of your sander.
Slide it in until the 6" One Track underneath bottoms out against
the edge of the work table. The 6" One Track serves as a stop
and also allows you to make small adjustments to the oval size.
OVAL SIZE & DIFFERENTIAL
We’ll use an 4" x 6" oval as an example in setting up the
Small Oval Jig. Measure 2" (half the small dimension of the
oval) from the sanding surface (or cutting tool) to the center of
the Inside Pivot (pivot closest to the cutting tool). The Inside
Pivot sets the small dimension of the oval, so 2" multiplied
by 2 gives you the 4" dimension. To make it easier, you can
also measure to the inside edge of the Pivot, then add 1/4", or
the outside edge of the Pivot and deduct 1/4". See fig. 4.
Set the differential of the Outside Pivot to the Inside Pivot to
get the 6" dimension needed, which is a 2" differential (6" - 4" =
2"). Divide the 2" differential by 2 (2"/2 = 1")to get the center-
to-center distance needed between pivots. Since the Pivots are
1/2" wide, cut a spacer to fit between them that’s 1/2" narrower
then the distance needed (1" - 1/2" = 1/2" wide spacer). Place the
1/2" wide spacer between the pivot edges and tighten the Outside
Pivot. Another way to position the Outside Pivot is to measure
3" (half of the 6" large oval dimension) from the sanding surface
(or cutting tool) to the center of the Outside Pivot. See fig. 4.
1
2
3
1
4
1/4” Spacing