The DICT Development Group
1 definition found
for Diametral pitch
From The Collaborative International Dictionary of English v.0.48 :
Pitch \Pitch\, n.
1. A throw; a toss; a cast, as of something from the hand;
as, a good pitch in quoits.
Pitch and toss, a game played by tossing up a coin, and
calling "Heads or tails;" hence:
To play pitch and toss with (anything), to be careless or
trust to luck about it. "To play pitch and toss with the
property of the country." --G. Eliot.
Pitch farthing. See Chuck farthing, under 5th Chuck.
2. (Cricket) That point of the ground on which the ball
pitches or lights when bowled.
3. A point or peak; the extreme point or degree of elevation
or depression; hence, a limit or bound.
Driven headlong from the pitch of heaven, down
Into this deep. --Milton.
Enterprises of great pitch and moment. --Shak.
To lowest pitch of abject fortune. --Milton.
He lived when learning was at its highest pitch.
The exact pitch, or limits, where temperance ends.
4. Height; stature. [Obs.] --Hudibras.
5. A descent; a fall; a thrusting down.
6. The point where a declivity begins; hence, the declivity
itself; a descending slope; the degree or rate of descent
or slope; slant; as, a steep pitch in the road; the pitch
of a roof.
7. (Mus.) The relative acuteness or gravity of a tone,
determined by the number of vibrations which produce it;
the place of any tone upon a scale of high and low.
Note: Musical tones with reference to absolute pitch, are
named after the first seven letters of the alphabet;
with reference to relative pitch, in a series of tones
called the scale, they are called one, two, three,
four, five, six, seven, eight. Eight is also one of a
new scale an octave higher, as one is eight of a scale
an octave lower.
8. (Mining) The limit of ground set to a miner who receives a
share of the ore taken out.
(a) The distance from center to center of any two adjacent
teeth of gearing, measured on the pitch line; --
called also circular pitch.
(b) The length, measured along the axis, of a complete
turn of the thread of a screw, or of the helical lines
of the blades of a screw propeller.
(c) The distance between the centers of holes, as of rivet
holes in boiler plates.
10. (Elec.) The distance between symmetrically arranged or
corresponding parts of an armature, measured along a
line, called the pitch line, drawn around its length.
Sometimes half of this distance is called the pitch.
Concert pitch (Mus.), the standard of pitch used by
orchestras, as in concerts, etc.
Diametral pitch (Gearing), the distance which bears the
same relation to the pitch proper, or circular pitch, that
the diameter of a circle bears to its circumference; it is
sometimes described by the number expressing the quotient
obtained by dividing the number of teeth in a wheel by the
diameter of its pitch circle in inches; as, 4 pitch, 8
Pitch chain, a chain, as one made of metallic plates,
adapted for working with a sprocket wheel.
Pitch line, or Pitch circle (Gearing), an ideal line, in
a toothed gear or rack, bearing such a relation to a
corresponding line in another gear, with which the former
works, that the two lines will have a common velocity as
in rolling contact; it usually cuts the teeth at about the
middle of their height, and, in a circular gear, is a
circle concentric with the axis of the gear; the line, or
circle, on which the pitch of teeth is measured.
Pitch of a roof (Arch.), the inclination or slope of the
sides expressed by the height in parts of the span; as,
one half pitch; whole pitch; or by the height in parts of
the half span, especially among engineers; or by degrees,
as a pitch of 30[deg], of 45[deg], etc.; or by the rise
and run, that is, the ratio of the height to the half
span; as, a pitch of six rise to ten run. Equilateral
pitch is where the two sloping sides with the span form an
Pitch of a plane (Carp.), the slant of the cutting iron.
Pitch of poles (Elec.), the distance between a pair of
poles of opposite sign.
Pitch pipe, a wind instrument used by choristers in
regulating the pitch of a tune.
Pitch point (Gearing), the point of contact of the pitch
lines of two gears, or of a rack and pinion, which work
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