CP Versus DP: Understanding the Difference Sign up for our E-Newsletters Enter your email address below:::: CP Versus DP: Understanding the Differences Author: Frank Burgos, Have you ever wondered what the designation “CP” or “DP” on a plate cylinder gear means? Most of us are familiar with gear selector charts, but just what is the difference between CP and DP? How are they related to printing repeat length? Here we’ll explore some of the differences and learn how we can liberate ourselves from the charts. Let’s begin by defining a few terms related to plate cylinders and gear construction: Printing Circumference: The measurement of the circle described by a point on a plate’s printing surface while printing.

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It is equal to the plate cylinder repeat. Pitch Circle: The imaginary circle on a plate cylinder gear that corresponds to the printing circumference. CP: Stands for “Circular Pitch”. It’s the distance from a point on a gear tooth along the pitch circle of the gear to the corresponding point on the next gear tooth.

1/2.8” 2MP CMOS Image sensor Max. 25/30fps@1080P Powerful 25x Optical and 16x Digital zoom WDR(120dB), 3D-DNR, Day/Night (ICR), ROI, Defog, AWB. CP: Stands for “Circular Pitch”. It's the distance. DP: Stands for “Diametral Pitch”. It's a ratio. With CP gears, repeat length calculations are straightforward.

Therefore, it's the difference in repeat between a plate cylinder and the next one in size. DP: Stands for “Diametral Pitch”.

It’s a ratio equal to the number of gear teeth per inch of printing diameter. Pi: The ratio between the diameter of a circle and its circumference. Pi = 3.1416 (to four decimal places) Pi x diameter = Circumference Circumference / Pi = Diameter CP Gears: With CP gears, repeat length calculations are straightforward. If we have 1/8” CP plate cylinder gears, this means that we have a total of 1/8” repeat length for every tooth on the gear; 1/4' CP means that we have a 1/4' repeat per tooth and so on. Therefore, to calculate the total repeat, all we need to do is multiply the number of teeth by the CP.