Cutting Crown Molding; Cutting Base Molding - Bosch GCM18V-12GDC Operating/Safety Instructions Manual

Cutting Base Molding

• Base molding can be cut vertical against fence or flat
on the table. The maximum size that can be verti-
cal on the fence is 6-3/4" (171mm), flat on table is
13-1/2" (343mm).
LOCATION OF
MOLDING ON SAW
Bevel Angle
Molding piece being cut
Miter Angle
Inside
corner of wall
Position
of molding
Finished side
Miter Angle
Outside
corner of wall
Position
of molding
Finished side

Cutting Crown Molding

Crown molding cuts must be positioned properly to fit
exactly.
There are two ways to cut crown molding: flat on table
or angled to table and fence.
Crown molding's "spring angle" is the angle between the
back of the molding and the bottom flat surface that fits
against the wall.
This miter saw has special miter detents at 31.6° and
bevel detents at 33.9°. These detents allow you to easily
position most crown molding flat on the table and make
precise cuts for 90° corners. NOTE: These detents can-
not be used with 45° crown molding. These detents are
only for use with crown molding that has a 38° "spring
angle."
Saw Operations
BASE MOLDING CUTTING INSTRUCTIONS
Molding in Vertical Position: Back of
molding is against
Bevel = 0º
To left of
corner
Left at 45º
Bottom
against table
on saw
Keep left
side of cut
Right at 45º
Bottom
against table
on saw
Keep left
side of cut
• Follow the table for helpful hints on cutting base
molding for corners that have 90° angles.
• Cutting base molding can be done either as a chop
cut or a slide cut depending on the size of the work-
piece.
the fence
To right of
corner
Right at 45º
Bottom
Top against fence
against table
Keep right
side of cut
Left at 45º
Bottom
against table against fence
Keep right
side of cut
See also page 56 for miter and bevel angle charts for
cutting crown molding that has 38° and 45° spring
angles. Each chart lists the exact miter and bevel set-
tings required for a wide range of corner angles.
Even though these angles are standards, most rooms do
not have angles of exactly 90°; therefore, you will need
to fine-tune your settings.
The optional Bosch GAM 220 MF and GAM 270 MFL
Digital Anglefinder/Protractors measure spring angles
and corner angles, then automatically determine the
exact miter and bevel settings necessary to make each
crown molding cut fit perfectly.
Molding in Horizontal
Position: Back of molding
is flat on the table
Bevel = 45º
To left of To right of
corner corner
0º 0º
Bottom
against fence
Keep left Keep left
side of cut side of cut
0º 0º
Bottom
Top against fence
Keep right Keep right
side of cut side of cut
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