How to punch smaller holes than sheet thickness?

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Punching 1mm holes in a 3mm thick sheet of SS 316 is generally not feasible due to the risk of the punch bending and breaking. Alternative methods include drilling with a cobalt HSS drill or a solid carbide drill for limited applications. Water jet and laser cutting are also viable options for creating smaller holes. Electrical discharge machining (EDM) can be used, with die-sinking EDM suitable for non-cylindrical holes and fast hole drilling EDM for cylindrical ones. Overall, traditional punching methods are not recommended for this thickness and hole size.
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How to punch smaller hole than sheet thickness in stainless steel.
Is it possible to punch 1mm holes in a sheet of SS 316 of thickness 3mm. I have a CNC punching machine but not sure if this would be possible.
 
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Tarun Tanwat said:
TL;DR Summary: How to punch smaller hole than sheet thickness in stainless steel.
Is it possible to punch 1mm holes in a sheet of SS 316 of thickness 3mm.
Probably not. The hole would not be parallel.

The lowest tech solution would be to drill a few holes with a Cobalt HSS drill.
Second; is to use a solid carbide drill for one hundred holes.
Third would be a water jet, and fourth, a laser.
 
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EDM
 
Tarun Tanwat said:
TL;DR Summary: How to punch smaller hole than sheet thickness in stainless steel.

Is it possible to punch 1mm holes in a sheet of SS 316 of thickness 3mm.
No. There is a formula in Manufacturing Processes for Engineering Materials by Kalpakjian for estimating the force on a punch:

Punch.jpg


From the total force, and the cross sectional area of the punch, you can calculate the compressive stress on the punch. Even if the punch had sufficient compressive strength to punch the hole, it would most likely bend sideways and break.
 
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