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1.) In order to make deformations (material deformations) it is necessary to pre-punch the clearance hole.
This pre-punch is normally bigger than the finished clearance hole.
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2.) The max. depth of a 90° sunk is 3/4 of the sheet thickness as the entire material thickness cannot be punched.
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3.) If the screw head height is higher than the sheet thickness, there are two possibilities to create the countersink.
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a.) A bigger screw thread clearance hole than required. Keep in mind that the surface area for the head support is reduced and the strength calculation must be
adjusted accordingly.
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b.) The sheet can be embossed to create the countersink. Be aware that a raised emboss may create problems with further sheet handling.
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