Hydro Power In-Place Machine Work

Posted by Matt Hecht

The Laron Preferred Solution™

Laron performed two field machining jobs at a hydro plant, using a Laron designed and built Journal Squirrel Machining tool. Laron successfully completed the on-site machining of the hydro unit’s generator shaft in the thrust collar. The scope of work included the following:

1. On-site machining of the generator shaft to restore critical shaft surfaces to original tolerances.
The surfaces of the generator shaft to be restored include:

a. The diameter of the shaft along the height of the thrust collar. The bottom 7 inches of the “fit” area will be machined to 22.710 + .000 -.003. The top of the shaft was machined to 22.695 +.005 -.005.

b. The “step” in the shaft where the thrust collar seats. This surface was machined and cut parallel to the top of the shaft. The top of the shaft was within .0005 inches of perpendicular to the shaft centerline, so the final seating area for the thrust collar could be cut within .0005 inches of perpendicular to the shaft centerline.

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