Special stamping techniques

Can a stamped or drawn part have a sharp internal corner instead of a radius?

Sources

1. CNC Milling Design Guide | Balford
   3. Use Practical Internal Corner Radii An end mill leaves a radius in any internal vertical corner. A truly sharp corner means another process—like Wire EDM—or a design change. Bumping up the radius lets us run a larger, stiffer cutter, which typically shortens cycle time and gives you more consiste...
2. Wire EDM Services China | Precision Wire Cutting
   Do I need a start hole? For internal profiles, yes — the wire must pass through the material, so a start hole is required. For external contours the wire can start from outside the blank. We confirm the start-hole position and diameter during DFM review. What corner radius can wire EDM hold? Wire ED...
3. CNC Milling Services China | Custom Milled Parts
   What is the practical limit on internal corner radii? A standard rotating cutter leaves a radius equal to its own. Deep pockets and small corners may need smaller tools (and therefore more passes) or a secondary process such as wire EDM for truly sharp corners. We review corner radius against functi...
4. How To Calculate Blank Size For A Deep Drawn Cup?
   Why does the formula give a larger blank than the real part needs? Because it assumes a sharp bottom corner and a wall that keeps the full sheet thickness. A radiused bottom corner removes material from the calculation, and real drawing thins the wall slightly, so a cup with a generous radius typica...
5. How To Calculate Blank Size For A Deep Drawn Cup?
   Q: Why does the formula give a larger blank than the real part needs? A: Because it assumes a sharp bottom corner and a wall that keeps the full sheet thickness. A radiused bottom corner removes material from the calculation, and real drawing thins the wall slightly, so a cup with a generous radius ...
6. Wire EDM Services China | Precision Wire Cutting
   Cut after heat treatment without annealing the material. Narrow slots & intricate profiles Features milling cannot reach with a practical tool. Through features Precise through profiles with controlled corner radius. Low-force parts Thin or delicate sections that would distort under cutting force. W...

What an engineer still needs from you

• material and material condition (grade, temper)
• material thickness, plus the key diameter, height and wall thickness
• tolerances, burr direction and the visual acceptance standard
• annual volume - it decides whether tooling is single-hit, progressive or transfer
• surface finish, and any secondary machining, annealing or plating

This page is an engineering answer, not a quotation and not a dimensional acceptance. It is generated from Balford's published material and held to the verified company fact sheet.