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HOME > CALCULATORS > BENDING TOLERANCES

BENDING TOLERANCES


Rotary Draw, Roll and Increment Bending Tolerances

Standard shop tolerances for rotary draw, roll and increment bending procedures are available upon request.



Spiral Bending Tolerances



Tolerances for Cold Spiral Bending
Plain view radius of 12'0" or less.

True Arc Length Plumb to Radius Line Torpedo Level Vertical Face Pitch in Degrees Height at Midpoint Height at Top
Under 10 ft +/- 1⁄2" Within 3° overall +/- 1° +/- 1⁄2" +/- 1⁄4"
10 ft - 17 ft +/- 3⁄4" Within 3 1⁄2° overall +/- 1° +/- 1" +/- 1⁄2"
17 ft - 24 ft +/- 1" Within 4° overall +/- 1 1⁄2° +/- 1 1⁄2" +/- 1"
Over 24 ft +/- 1" Within 5° overall +/- 1 1⁄2° +/- 2" +/- 1"
*To properly QC, all stringers are stood up at full scale pitch.


Tolerances for Cold Spiral Bending
Plain view radius greater than 12'0"

True Arc Length Plumb to Radius Line Torpedo Level Vertical Face Pitch in Degrees Height at Midpoint Height at Top
Under 10ft See Note 1 Within 3° overall +/- 1° n/a n/a
10 ft - 17 ft See Note 1 Within 3 1⁄2° overall +/- 1° n/a n/a
17 ft - 24 ft See Note 1 Within 4° overall +/- 1 1⁄2° n/a n/a
Over 24 ft See Note 1 Within 5° overall +/- 1 1⁄2° n/a n/a
*To properly QC, all stringers are stood up at full scale pitch.

Notes:
1. Plumb to Radius line tolerance is Not Applicable. Instead, Albina will apply our standard shop cord and rise tolerances (available upon request).


Tolerances for Cold Spiral Bending
Plain view radius of 20'0" or less.

True Arc Length Plumb to Radius Line Torpedo Level Vertical Face Pitch in Degrees Height at Midpoint Height at Top
Under 10ft +/- 1⁄4" Within 1 1⁄2° overall +/- 1⁄2° +/- 1⁄2" +/- 1⁄4"
10 ft - 17 ft +/- 1⁄2" Within 2° overall +/- 3⁄4° +/- 3⁄4" +/- 3⁄8"
17 ft - 24 ft +/- 3⁄4" Within 2 1⁄2° overall +/- 1° +/- 1" +/- 3⁄4"
Over 24 ft +/- 1" Within 3° overall +/- 1 1⁄2° +/- 1 1⁄2" +/- 1"
*To properly QC, all stringers are stood up at full scale pitch.


Tolerances for Cold Spiral Bending
Plain view radius greater than 20'0"

True Arc Length Plumb to Radius Line Torpedo Level Vertical Face Pitch in Degrees Height at Midpoint Height at Top
Under 10 ft See note 1 Within 1 1⁄2° overall +/- 1⁄2° n/a n/a
10 ft - 17 ft See note 1 Within 2° overall +/- 3⁄4° n/a n/a
17 ft - 24 ft See note 1 Within 2 1⁄2° overall +/- 1° n/a n/a
Over 24 ft See note 1 Within 3° overall +/- 1 1⁄2° n/a n/a
*To properly QC, all stringers are stood up at full scale pitch.

Notes:
1. Plumb to Radius line tolerance is Not Applicable. Instead, Albina will apply our standard shop cord and rise tolerances (available upon request).


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I ended up in the hospital when the stair stringers arrived, but I was told that it was the best job of rolling and forming the shop here had ever seen. It went together perfectly!


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Curved steel members don't just "come that way" from the mill. Curved steel members are produced from straight lengths of material and are bent per your specifications.

Albina Co., Inc. produces the highest quality curved steel products in the steel industry and provides the most reliable and professional customer service experience.

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