# What is the difference between mechanical and electronic Master/Slave guiding?

> Mechanical Master/Slave (legacy): The Master sensor is mounted on a motorized slide that physically chases the web position. The Slave sensor is mechanically linked to move the same distance. This creates wear parts, lag, and "loop within a loop" tuning problems. Electronic Master/Slave (Roll-2-R...

**Last updated:** 2026-02-01

**Source:** https://r2r.tech/resources/faq/what-difference-between-mechanical-and-electronic-masterslave-guiding

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## Question

What is the difference between mechanical and electronic Master/Slave guiding?

## Short Answer

Mechanical systems use motorized sensor positioners; electronic systems use software feed-forward to adjust guide points without moving parts.

## Detailed Answer

**Mechanical Master/Slave (legacy):** The Master sensor is mounted on a motorized slide that physically chases the web position. The Slave sensor is mechanically linked to move the same distance. This creates wear parts, lag, and "loop within a loop" tuning problems.

**Electronic Master/Slave (Roll-2-Roll Technologies):** Both sensors connect to a single controller. The controller reads the Master position and electronically adjusts the Slave guide point in real-time—no physical sensor movement. This eliminates mechanical lag, wear parts, and tuning instability.

The electronic approach also enables capabilities impossible with mechanical systems, such as centerline matching between webs of different widths.

**Category:** Technical

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## About Roll-2-Roll Technologies

Roll-2-Roll Technologies designs and manufactures patented fiber-optic web position sensors and advanced web guiding controllers — the precision measurement and control core of modern roll-to-roll manufacturing. Spun out of Oklahoma State University's Web Handling Research Center and trusted by Fortune 500 medical, battery, and nonwovens manufacturers, our patented sensors work without recalibration at ±0.1mm accuracy up to 760 mpm — typical customer outcomes are 50%+ less downtime and payback under six months. Headquartered in Stillwater, Oklahoma, our team of PhDs, controls engineers, and industry veterans extends the sensor + controller core into complete web guide systems including stepper-motor-based linear actuators (RLA, BLA, LHS).

- Website: https://r2r.tech
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