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Perfect Crown Molding CP505A 12 Combination Protractor



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the secret to a good-looking crown

molding job is having very tight-fitting

miters now that can be a difficult

proposition it can also be a lot easier

using a tool like this combination

protractor to use it simply place the

tool in the corner open the wings until

they contact the wall and read the mitre

cut directly from the gage now if you're

cutting crown molding on an angle just

set the miter saw to match the setting

on the combination protractor insert the

workpiece into the miter saw and make

the cut however if you're cutting

molding on the flat you'll be making a

compound miter cut and will need to

determine the saw miter angle as well as

the bevel angle in this case the process

becomes a bit more involved for one

thing we'll need to know the molding

spring angle that's the angle between

the molding itself and the wall in most

cases it will be either 38 degrees or 45

degrees the spring angle can be easily

determined with the combination

protractor

using the conversion table on the back

of the tool locate the column with the

appropriate spring angle in this case 38

degrees then move down the wider angle

column until you find the row showing

the miter cut setting that matches the

one displayed in the front of the

combination protractor next read the

miter angle and set the saw to match now

let's return to the table and again look

under the 38 degree spring angle this

time go to the bevel angle column drop

down to the correct row note the

corresponding bevel angle and set the

saw to match the saw is now set to begin

cutting this particular corner when

cutting crown molding the orientation of

the workpiece to the saw is critical in

this example I've labeled the right and

left hand pieces as well as the bottom

edges

when cutting the left-hand section on an

inside corner like this swing the saw

arm to the right and place the workpiece

to the left of the blade with the bottom

edge away from the saw fence to cut the

right-hand section swing the saw to the

left and place the workpiece to the left

of the blade with the bottom against the

fence

here's how to handle an outside corner

use the combination protractor to

measure the wall angle and calculate the

mitre in bevel angles here - I've marked

the Moldy for orientation when cutting

the left-hand section of an outside

corner swing the saw arm left and place

the work to the right side of the blade

with the bottom edge against the fence

for the right-hand piece swing the arm

to the right and set the work to the

right side of the blade but position the

bottom edge away from the fence

so if you want a professional-looking

job without a lot of a hassle well you

might want to try a combination

protractor