In chapter 5 lesson 6, Jake explains bend deformation, what happens to your part and its features during the bending process. While previous lessons covered bend allowance and deduction calculations, this one focuses on the physical effects of bending and how they impact surrounding geometry.

Jake breaks down how the punch and die interact, showing that successful bends require three points of contact. He explains why parts need a minimum flange length; if the flange is too short, it can fall into the die and cause a failed bend. He also introduces die marks (or witness marks), the small contact marks left by the punch and die, and discusses how friction and stretching in the bend area can lead to visible deformation.

You’ll also learn about feature distortion, such as holes or threads becoming stretched or oblong if they fall too close to the bend line. SendCutSend automatically detects and warns you about these issues during checkout, allowing you to approve or adjust your design before production.

What You’ll Learn:

• What bend deformation is and why it matters in design
• How punch and die contact affects part shape and surface finish
• Why minimum flange length is critical for successful bending
• What causes die marks and how to account for them
• How friction and stretching affect nearby features
• Why features near bends can distort and how SendCutSend warns you in checkout
• How to design features safely outside the deformation zone for clean, accurate bends