Melbourne MTC-49407, Owner'S Manual

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Timbers with birdseye, interlocked grain, fiddleback or other kinds of
reversing grain will be more easily smoothed with a 50° blade, yielding
an overall cutting angle of 62°.
While you can change the bevel angle of a single blade, this is very
labour-intensive, especially when going from a higher to a lower angle.
Additional blades are available from Melbourne Tool Company that come
pre-ground to the angles mentioned above. Having multiple blades that
can be swapped out allows the user to change cutting angle quickly and
will make the MTC-49407 a very versatile tool.
Smoothing jobs are often better handled with a higher cutting angle. The
38° blade gives an overall cutting angle of 50°, an excellent general-
purpose smoothing angle. The 38° blade is also ideal when traversing
(planing panels across the grain).
Planing with grain 38° Bevel Angle
50° Bevel Angle
Figured Grain
25°Bevel
37°Cutting
Angle
12°Bed Angle
12°Bed Angle
12°Bed Angle
50°Bevel
62°Cutting
Angle
38°Bevel
50°Cutting
Angle
25°Bevel
37°Cutting
Angle
12°Bed Angle
12°Bed Angle
12°Bed Angle
50°Bevel
62°Cutting
Angle
38°Bevel
50°Cutting
Angle
Smoothing using the 38° blade
Planing figured timber using the 50 ° blade