Ryobi MS181 Manuel de l'opérateur télécharger pdf (Page 29)

Page 29

CUTTING CROWN MOLDING

Your compound miter saw does an excellent job of

cutting crown molding. In general, compound miter

saws do a better job of cutting crown molding than

any other tool made.

In order to fit properly, crown molding must be com-

pound mitered with extreme accuracy.

The two contact surfaces on a piece of crown molding

that fit flat against the ceiling and the wall of a room

are at angles that, when added together, equal

exactly 90°. Most crown molding has a top rear angle

(the section that fits flat against the ceiling) of 52° and

a bottom rear angle (the section that fits flat against

the wall) of 38°.

LAYING MOLDING FLAT ON THE

MITER TABLE

See Figure 39.

To use this method for accurately cutting crown

molding for a 90° inside or outside corner, lay the

molding with its broad back surface flat on the miter

table and against the fence.

When setting the bevel and miter angles for com-

pound miters, remember that the settings are interde-

pendent; changing one angle changes the other angle

as well.

Keep in mind that the angles for crown moldings are

very precise and difficult to set. Since it is very easy

for these angles to shift, all settings should first be

tested on scrap molding. Also, most walls do not have

angles of exactly 90°, therefore, you will need to fine

tune your settings.

OPERATION

CEILING

OUTSIDE

CORNER

INSIDE

CORNER

CROWN MOLDING FLAT ON MITER TABLE

38°

52°

FENCE

MITER TABLE

TOP EDGE AGAINST FENCE =

LEFT SIDE, INSIDE CORNER

RIGHT SIDE, OUTSIDE CORNER

BOTTOM EDGE AGAINST FENCE =

RIGHT SIDE, INSIDE CORNER

LEFT SIDE, OUTSIDE CORNER

FENCE

MITER TABLE

Fig. 39

1 2 ... 24 25 26 27 28 29 30 31 32

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Ryobi MS181 Manuel de l'opérateur Page 29

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