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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 +/- 12" Within 3° overall +/- 1° +/- 12" +/- 14"
10 ft - 17 ft +/- 34" Within 3 12° overall +/- 1° +/- 1" +/- 12"
17 ft - 24 ft +/- 1" Within 4° overall +/- 1 12° +/- 1 12" +/- 1"
Over 24 ft +/- 1" Within 5° overall +/- 1 12° +/- 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 12° overall +/- 1° n/a n/a
17 ft - 24 ft See Note 1 Within 4° overall +/- 1 12° n/a n/a
Over 24 ft See Note 1 Within 5° overall +/- 1 12° 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).
  2. The level to vertical face is a cumulative tolerance. You cannot be more than half the allowed tolerance out at any one point.
    For example: If your tolerance is 11/2° for the vertical face, you can be 3/4° out at the bottom, 0° out at midpoint, and 3/4° out at the top. This would be 11/2° out total. You would not be allowed to be more than 3/4° out at any given point since that would be more than half your tolerance in one spot.


Tolerances for Hot 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 +/- 14" Within 1 12° overall +/- 12° +/- 12" +/- 14"
10 ft - 17 ft +/- 12" Within 2° overall +/- 34° +/- 34" +/- 38"
17 ft - 24 ft +/- 34" Within 2 12° overall +/- 1° +/- 1" +/- 34"
Over 24 ft +/- 1" Within 3° overall +/- 1 12° +/- 1 12" +/- 1"
*To properly QC, all stringers are stood up at full scale pitch.


Tolerances for Hot 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 12° overall +/- 12° +/- 12" +/- 14"
10 ft - 17 ft See note 1 Within 2° overall +/- 34° +/- 34" +/- 38"
17 ft - 24 ft See note 1 Within 2 12° overall +/- 1° +/- 1" +/- 34"
Over 24 ft See note 1 Within 3° overall +/- 1 12° +/- 1 12" +/- 1"
*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).
  2. The level to vertical face is a cumulative tolerance. You cannot be more than half the allowed tolerance out at any one point.
    For example: If your tolerance is 11/2° for the vertical face, you can be 3/4° out at the bottom, 0° out at midpoint, and 3/4° out at the top. This would be 11/2° out total. You would not be allowed to be more than 3/4° out at any given point since that would be more than half your tolerance in one spot.


Your Steel Bending Experts

People Like Us!

These rolled plates you processed for us had to be welded together for an exposed circular guardrail. We assembled the plates, ends lined-up, radiuses matched – the parts fit perfectly. Thank you and your team for your accuracy and performance.


Joshua H.

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