Like Blanchard grinding, surface grinding uses a magnetic chuck and an abrasive wheel to remove material. Most surface grinders have the abrasive wheel spindle in a horizontal position. Surface grinding can produce a surface that is smoother, flatter and more parallel than Blanchard grinding, and it is ordinarily used only for removing small amounts of material at a time. Grinding permits very accurate tolerances of less than 0.001″ and allows for very smooth surface finishes up to 16 microinch RMS.
There are four surface grinders at Withers Tool, Die and Manufacturing Company. One of our machines has a vertical spindle and a magnetic chuck that pivots, which works well for grinding angle shear blades and performing other non-parallel applications. The longest surface grinder has a magnetic chuck that is 240″ long and 30″ wide and has ground parts parallel within 0.0003″ over that length.
Specs for Our Surface Grinders
- Mattison SSG – 30″ x 36″ x 240″
- Mattison SSG – 24” ” x 42″ x 120″
- Gardner #618 – 6″ x 12″ x 18″
- Goeckel GB 65el Knife Grinder – 10″ x 10″ x 100″
Examples of Surface Grinding Work/Jobs We Do
- Die Work
- Mold Work
- Tooling Plates
- Shear Blades
Surface Grinding can obtain the following tolerances:
- Flatness +/- 0.0001″ per foot
- Parallel +/- 0.0001″ per foot