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Straight Grind
What is Straight Grind?
Straight Grind is a Pivot Punch Corporation exclusive grinding process, with grind lines parallel to the piercing action and perpendicular to the line of potential fracture.
Straight Ground punches offer many advantages over cylindrically ground punches:
Reduction of galling, snap-back, pick-up or firing;
Easy punch withdrawal through material;
Lubrication-retaining characteristics of the ridges;
Straight shearing and less tonnage required;
Punches holes to size with less stripping pressure;
Reduction of buckling, and retained concentricity of the punch;
Reduced rollover and dimpling on thin material.
These unique features combined with steels such as M2, CPM-M4, CPM-3V, CPM-10V, CPM-15V offer you the absolute best punch in the industry.
Pencil-Testing the Straight Grind Theory*
Figure 1. Move pencil radially (90º to the piercing action):
Graphite builds up on straight grind, Area A;
No graphite visible when moving pencil radially on cylindrical grind, Area B.
Figure 2. Move pencil lengthwise (parallel to the piercing action):
Pencil "removes" graphite buildup on straight grind, Area A;
Graphite builds up on cross grain or cylindrical grind, Area B.
This demonstration utilizing graphite is indicative of metal pickup and galling that occurs in metal stamping.*
Note how straight grinding tends to reject pickup and galling. *NOTE 1: Surface irregularities caused by grinding are shown exaggerated for clarity.
*NOTE 2: The above illustration is for demonstration purposes only. Straight grinding is illustrated for only one half of the point length. Pivot’s straight grind punches are ground the entire point length and partially up the blend radius to minimize the possibility of punch point fracture at the base of the blend radius.
