Which installation method ensures proper tension in a synchronous belt drive?

Ensuring proper tension in a synchronous belt drive is crucial for optimal performance and longevity of the system. Aligning pulleys to touch the straight edge is the most effective method because it guarantees that the pulleys are perfectly aligned, which is essential for maintaining the correct tension throughout the belt. When pulleys are aligned correctly, it prevents uneven wear and potential slippage, allowing for efficient power transfer.

This method uses a straight edge or similar tool to ensure that the pulleys are parallel and at the correct distance from each other, which helps in achieving uniform tension across the belt. Proper alignment also minimizes the risk of vibrations and noise, contributing to the overall reliability of the drive system.

In contrast, the other methods presented would not achieve the desired results and could lead to issues such as increased wear or failure of the belt drive.