How Wide Should Steel Be Pre-Bending for a 21 Finish with a 1 Lip?

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Discussion Overview

The discussion centers around determining the initial width of a piece of .125" steel sheet metal required to achieve a final width of 21" after a 1" lip is bent at a 90-degree angle. The scope includes practical application and technical reasoning related to metal bending calculations.

Discussion Character

  • Technical explanation, Mathematical reasoning

Main Points Raised

  • One participant inquires about the initial width needed for the steel sheet before bending, suggesting it will be more than 22".
  • Another participant provides a link to a bending allowance calculator as a resource for determining the necessary width.
  • A subsequent reply expresses satisfaction with the provided reference, indicating it was helpful.
  • Another participant notes that the median fiber during bending may not be at the midpoint of the thickness, suggesting that the specific bending machine used could affect this position.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the exact initial width needed, and there are varying perspectives on the factors influencing the bending process.

Contextual Notes

There is an acknowledgment that the position of the median fiber can vary based on the bending machine, which may introduce additional considerations into the calculations.

badgermanb
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I need a piece of .125" steel sheet metal to be 21" wide after a 1" lip is bent to 90 degrees on one side. How wide does the initial piece of steel need to be before bending in order to achieve this? I know it will be more than 22", but how much more?

If I recall its fairly simple to figure out I just can't remember how to do it. Thanks
 
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Thanks that works perfectly.
 
Excellent reference.

Note that the median fiber is not necessarily at the middle of the thickness. The actual machine doing the bending is going to dictate just where that median fiber is. You may very well find that it was closer to 1/3 from the inner surface than 1/2.
 

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