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Figure 12: Stepping calculation in blade software
The described blade stepping procedure will not influence the blade reference
point location and the geometry of the cutting-edge surrounding surfaces. The
blade stepping merely extends or shortens the blade dedendum S890 as illus-
trated in Figure 12.
26.5 Blade Spacing Correction in TREFACE Software
The 3-face blade calculation program TREFACE applies the strategy to estab-
lish the required cutter radii at the calculation point and define side rake and
top rake angle correctly with respect to the relative cutting direction, given by
the kinematic blade offset angle. While providing the requested blade geome-
try, the program has to assure a sufficient front face cleanup, which has an in-
fluence on the resulting timing angle between the outside blade and the follow-
ing inside blade.
The initial timing angle j (Figure 13) is derived from the original 2-face calcu-
lation which is always exactly or close to 360° divided by twice the number of
blade groups (which is the slot spacing angle of the cutter head). This original
timing angle in connection with the original point radius adjustment in the 2-
face calculation assures the cutting of the correct tooth thickness.
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