Jevero Cost Glossary

Here you can find all terms and definitions for a better understanding of cost computation and application use.

A

  • ADJUSTMENT FACTOR: can be set for Leather materials only, and represents a characteristic related to the regularity for a specific hide; in this way, different leather types can be managed accordingly when computing their yield and other efficiency parameters
  • ALLOWANCE: the minimum distance every placed piece must maintain from the material sheet border. For the allowance/distance applied to every piece pair, see Part gap
  • AREA:

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B

  • BOX AREA: the area of the smallest rectangular box that encloses a geometry (can either be a single piece, a pair or a set of pieces)

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C

  • CATEGORY: it's a custom label/tag that can be associated to a material, so that all materials of a certain kind can be quickly found in the material list using the category filter. The category is also included in the final report.

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E

  • EFFICIENCY: also called Utilization, it's a ratio between the placed pieces' area and the total area considered
    • IDEAL __ : the ratio between the area taken up by all placed pieces and the area of the bounding box of all placed pieces
    • REAL __ : the ratio between the area taken up by all placed pieces and the area of the entire material sheet used

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G

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I

  • INITIAL ROTATION: the base rotation to apply to each piece copy; the nesting algorithm will place pieces starting from this value, incrementing it by multiples of the Rotation factor
  • ITERATION: each step performed by the nesting algorithm to rotate and place a piece copy and compute the fitness score (i.e. how "good" the placement is)

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L

  • LEATHER ASSESSMENT: nesting of parts having a Leather type material, follows a different algorithm, based on the placement of just 6 copies of the part, which can be either all placed in the same direction (the so called 0 degree mode) or with 2 pieces rotated by 180° (180 degree mode)

M

  • MATERIAL KIND: see Material type
  • MATERIAL TYPE: the type of material shape; Jevero Cost can manage material of the following kinds:
    • Single Sheet - rectangular shape having a defined width and height
    • Roll - rectangular shape having a defined height and indefinite width
    • Strip - similar to Roll, but with a smaller height, intended to be used for thin strips that only need to be cut off in length
    • Custom - irregular shaped material Leather defined by its contour
    • Leather - similar to Custom, but intended for leather materials only, which usually require a different costing computation

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P

  • PART: see Piece
  • PART GAP: the minimum distance required for each adjacent placed pieces
  • PART WASTE: see Waste
  • PIECE: the single geometry representing the shape of a part that needs to be placed on a material for cutting
  • POLYGON SIMPLIFICATION: the percentage of points that are removed from the original piece polygon, in order to simplify it and speed up the nesting iterations; lower values imply more precision but longer nesting times; higher values imply less precision but nesting iterations executed much faster
  • PRIME: can be set for parts having a Leather material, it indicates if the part needs to be placed in a high quality region of the leather material (PRIME) or not (NON-PRIME)

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Q

  • QUALITY GRADE: a percentage indicating the level of quality to be assigned to a material (0% = minimum quality, 100% = maximum quality)
  • QUANTITY PER PAIR: the number of pieces used for a pair of shoes

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R

  • ROTATION FACTOR: the rotation step to apply to the base rotation (see initial rotation) by the nesting algorithm, to try to position the piece in the most appropriate direction (e.g given an initial rotation of 15° and a rotation factor of 90°, the nesting algorithm will try to position a piece by applying the following rotations: [15°, 105°, 195°, 285°])

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S

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U

W

  • WASTE: a percentage indicating an extra waste for each part/piece to consider when computing the final yield/efficiency
  • WASTE AREA: in the Leather assessment, the unused area inside the sample parallelogram detected for the evaluation of the overall placement (i.e. the white region that corresponds to the actual waste)

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Y

  • YIELD: the amount of material needed for a pair of part copies; in case of Single Sheet material, it represents the number of sheets needed for a pair; in case of Roll material, it represents the number of width unit (set in the material properties) needed for a pair; this is useful to quickly obtain how much material is needed to produce a certain number of pairs of shoes; e.g. given a yield equal to 0.025 for a Single Sheet material, to produce 1,000 pairs of a certain piece, we would need 0.025 x 1,000 = 25 sheets; for a Roll material where the width unit is set to m, we would need 25 m of material from that roll

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