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In Grosser's genera] case:
and normal base pitch, as:
where
t - tooth thickness at the diameter where cp is measured
p ~ circular pitch at the same diameter.
(14)
The similarity between Equations Sand 13 has led to. a
search fer a way to express the fundamental proportions of
a gear pair in the same terms, as dimensionless ratios of to,
Ph and N, independent of the cutter geometry or the units
of measurement,
"T"Factor
Definition. The author proposes that the involute of the
pressure angle in the transverse plane at the diameter where
the tooth space is equal to the tooth thickness, be used as
the dimensionless comparison factor. This factor, called T,
for transverse tooth thickness factor, is dimensionless, easily
calculated and extremely useful. It would also be possible to.
use the pressure angle at this diameter, which is in more
familiar units, at the expense of an additional mathematical
conversion. This angle will be shown for easy reference in
parentheses as (cf>T) wherever numerical values for T aile
shown, for easy reference ..
Ca.lculan:on of T. Equation 13 can be restated by multiply~
ing it by cosVtb/cosVtb, in terms of normal tooth thicknesses
IJ J'J J-J .E.~\H DO;::
. Possibly,
you hue· never heard 01 f[w7. IBul, thousands 01 our variety 01
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