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.
Comparing 3 Types of Grinding
|Vertical Spindle Rotary Table||Vertical Spindle Reciprocating Table||Horizontal Spindle Reciprocating Table|
|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|
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.