Rockwell Automation 1771-QC , D17716.5.25 SER/B SERVO POS - Manual (Page 19)

Positioning Concepts
Chapter 3
3Ć6
Leadscrew pitch is the linear distance from one peak of the screw thread
to the next. A leadscrew with a pitch of 1/4 inch is shown in Figure 3.5.
Figure 3.5
Leadscrew Example Showing Pitch
4 threads per inch
(4 pitch) in this example
Pitch is
1/4 inch
in this
example
12003
If the leadscrew has only one thread, the pitch is also equal to the lead,
which is the distance the axis travels each revolution of the leadscrew.
You can see from Figure 3.5 that the axis will travel 1/4 inch per
revolution if the pitch is 1/4 inch. Since leadscrews normally have only
one thread, and pitch is a more common term than lead, in this publication
we use the term pitch to refer to the distance the axis travels for each
revolution of the leadscrew.
Do not confuse leadscrew pitch with its inverse, which is the number of
pitch (threads) per inch. In the example of Figure 3.5, the leadscrew has 4
pitch (threads) per inch. A leadscrew with a pitch of 1/4 inch is often
described as being a 4-pitch (per inch) leadscrew.
Leadscrew Pitch