Notch a variety of angles with one set of 3-way corner notching tools
This is another application for an auto index station. A three-way corner notching tool can cut any angle larger than the smallest point by programming single or multiple hits. 15o is the smallest angle available.


Clearance corners in dies control corner burrs.
A radius in the corners of rectangular and square dies with clearance greater than .020”(0.5mm) keeps clearance uniform around the corner of the punch. If the die is sharp cornered too, then distance between punch and die corners would be greater than side clearance, resulting in large burrs. Ordering rectangle and square punches with .030” radius corners will drastically reduce corner wear on the punch. Punch corner wear can be a problem when punching thick, highly abrasive materials.


Shaving makes straight-walled holes without drilling
When you need a smooth, straight-walled hole, shaving can save the time and trouble of performing a second operation on another machine. To do this, you need to punch the hole twice. First use a punch with total clearance taken off equal to 20% of material thickness, and a die with total clearance .004”(0.1mm) over the desired finished shaved hole size. Then, program a second hit in the same place using the same size die and a punch the size of the desired finished hole. The second operation will shave the sides of the hole, removing most of the rollover and fracture effects caused in the first step, and enlarge the burnished area. This operation works best on mild steel and other materials that shear well. The example shown is a finished shaved hole of 1.000”(25.4mm) diameter in .187”(4.7mm) thick material. Use Mate’s fully guided tools for best results when hole-shaving materials thicker than 0.120”.

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