Our Process

Roll Inspection

Each roll is carefully inspected at our plant or the customer's site. A full assessment is issued prior to quote. Customers are always welcome to inspect work while in progress or before it is shipped. Certified records of post-work measurements and full inspection reports issued on request.

Grinding

Waldrich-Siegen grinders are positioned on their own vibration-absorbing foundations. Grinder capacities reach diameters of 144", lengths of 600", and weights of 200,000 lbs.

Lathes

Lathe capacities reach a diameter of 62" with an over carriage up to 72" over ways. Lengths reach 668", and weights reach 200,000 lbs. All lathes have full machining capabilities.

Superfinishing & Polishing

Surface finishes as fine as 1/4 to 1/2 micro inch Ra are routinely achieved.

Dynamic Balancing

Precise balancing machines simulate in-plant rotation prior to shipping. Here a 550" marine drive shaft is dynamically balanced.

Dynamic Leak Testing Swim Rolls/
Rebuild All Manufacturers Variable Crown Rolls

Swim rolls are leak-tested under simulated mill conditions prior to shipping. Also, many of our customers have so much confidence in our abilities that they entrust PRG to repair and rebuild their variable crown rolls. Precision Roll Grinders successfully rebuilds, upgrades and modifies rolls manufactured by Kusters, Valmet, Metso, Beloit CC Series, Voith-Profil and Nipco, Hunt and Moscrop, and Farrel.

Journal Repair & Replacement

Several methods are available to bring journals back to spec. Here brush-plating applies hard alloy to repair a worn journal surface.

Suction Rolls and Specialty Roll Rebuilds