Grinding Steel | Precision Grinding, Inc.

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Grinding Steel

PGI is proud to have one of the largest grinding capacities in the United States.

Grinding is a process that moves a grinding wheel or segment in a plane while the wheel contacts the work piece and removes material to create a flat surface. Parts may require surface grinding for several reasons, including:

  • Very flat surface is required
  • Very accurate thickness tolerance is needed
  • Very smooth surface finish is required
  • Need to remove material from very hard materials
  • Quicker material removal


Vertical Spindle Grinding
(also known as Blanchard Grinding)

The face of a wheel or segmental wheel is used on the flat surface. Vertical spindle grinding, or Blanchard grinding, is often used for fast material removal, but some machines can accomplish high-precision work. The workpiece is held on a reciprocating table or a rotary-table machine.

Horizontal Spindle Grinding

The periphery (outside diameter) of the wheel is in contact with the workpiece, producing the flat surface. Horizontal spindle grinding is used in high-precision work on simple flat surfaces, flat surfaces next to shoulders, and recessed surfaces.
Grinding Applications


Comparing 3 Types of Grinding

Vertical Spindle Rotary Table Vertical Spindle Reciprocating Table Horizontal Spindle Reciprocating Table
vertical spindle rotary table sketch vertical spindle reciprocating table sketch horizontal spindle reciprocating table sketch
High horsepower High horsepower Low horsepower
Good for stock removal, plates Good for long bars and heat sensitive work Good for low stock removal, higher tolerances
Holds approximately 63 rms surface finish Holds approximately 63 rms surface finish Holds approximately 32 rms surface finish
±0.005 thickness tolerance ±0.005 thickness tolerance Low stock removal, generally ± .001 thickness, flat within .001/ft.
.003/ft. flatness tolerance .003/ft. flatness tolerance Higher tolerance
Cross hatch, spiral pattern finish Cross hatch, spiral pattern finish Longitudinal pattern, grain finish
vertical spindle rotary table image vertical spindle reciprocating table image horizontal spindle reciprocating table image


16 Grinding Machines

  • Vertical Spindle Rotary Grinding
    • 128” diagonal grinding capacity
    • 45” high
  • Vertical Spindle Reciprocating Grinding
    • 48” x 200” vertical spindle
    • 16” high
  • Horizontal Spindle Reciprocating Grinding
    • 36” x 200” surface grinding
    • 32” high

We regularly step-grind parts larger than the sizes listed above. Please contact us for details.


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