Standard assumptions used for the calculation of cutting length

  • The fabricated rebars (Cut & Bend) are measured from outer-to-outer ends to account for the cement cover thickness.
    (Refer L1 and L2 measurement points on Drawing 1 & 2 and refer R and Ch L measurement points on Drawing 3 & 4).

  • Bend Angles are measured as the angle of bend from the previous straight profile of the rebar.
    (Refer bend angle θ1 on Drawing 1 & 2). In case of arcs, angle is measured as the total covering angle of the profile, as in drawing 3.

  • According to civil norms, the diameter of the mandrel to be used for bending, is as follows:

    • For 6mm to 16mm: D=4d

    For above 16mm (to 40mm): D=7d

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    Where d is the diameter of the rebar to be bent and the value of D is the minimum requirement in-order to prevent occurrence of any elongation, and residual stress whilst bending the rebar rod. Please refer drawing 1 & 2.

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    In case the exact mandrel size is not available, user can use the next available size of Mandrel diameter (D) to follow the norms and calculate the cutting length using the “User -defined D” option where he or she must enter the corresponding D as an input.

    “User-defined D” option can be used also if user considers the elongation/shortage by using a smaller size of D than the recommended size is negligible or as per the user preference

  • Elongation of the rebar rod whilst bending is considered as zero (if the mandrel diameter is followed as per civil norms)

    • Accordingly, the cutting length will be the length of the center line passing through the rebar rod (please refer the center line of the rebar in drawing 1, 2, 3 & 4). As we have the outer-to-outer measurement requirements, the center line length is derived from these outer-to-outer measurements.

  • A tolerance limit of + or – 5mm is allowed in the Cut and Bend as per standards.

  • The maximum number of bends in a shape is considered as 5 (according to standard/ regular shapes) here.

    • Nevertheless, a greater number of bends will be included in advanced version of this calculator as per market need.

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