Material types

Jevero Cost can handle different kinds of material, namely:

  • Single sheet: it is a simple rectangular sheet of material
  • Roll: it is a continuous roll that is usually fed into cutting machines
  • Strip: similar to a roll, but it's way more thinner and usually cut in length spans, rather than by means of cutting dies
  • Custom: it is a sheet of material having an irregular shape
  • Leather: it is specifically intended for leather material

See details in the next sections.

Single sheet

single sheet

A single sheet is a rectangular piece of material for which the user can specify:

  • Sizes: the sheet sizes can be specified both as presets (A0, A1, A2, ...) or custom values, that is width and height associated with a specific unit of measure (mm, m, ft, yd, ...)
  • Allowance: this is the allowance for the entire sheet margins, so that pieces will be placed considering an offset from the sheet borders
  • Part allowance: this is the allowance for each part that will be placed on the sheet during the nesting phase (e.g. pieces will be at least this distance apart from each other)
  • Cost: the cost for this type of material can be specified for each unit of measure (for instance $10/m2). Jevero Cost will automatically compute the cost of the entire sheet, from the sheet's sizes.

The costing for the single sheet is performed by nesting the parts on the sheet and computing how many pairs can be cut with one sheet. That is then compared against the cost of the material to generate a cost.

Roll

roll

The roll represents an "infinite" sheet of material having a certain height. The properties that can be specified for a roll are:

  • Sizes: unlike the single sheet, a roll can be assigned a height value only (the width is considered "infinite", and the actual efficiency during the nesting phase is computed considering a linear unit of measure)
  • Allowance: see Single sheet
  • Allowance: see Single sheet
  • Cost: like the Single sheet, the cost is expressed for each unit of measure, but since the total size of the roll is not known, the cost is computed considering the provided height and a width equal to a unit of the measure chosen

The costing is calculated by nesting the pieces on a virtual roll, the pattern is then used as a base for the calculation assuming that the utilization will be repeated across the roll.

EXAMPLE

If a roll has a height equal to H = 120 cm and a cost per unit equal to C = $ 5.00 / m2, the final cost will be C x H x 1 = 5.00 ($/m2) x 1.2 (m) x 1 (m) = $ 6.00

Strip

strip

Strips are cut in length spans and used as parts "as-is". Therefore they are not actually nested. The user can provide the following information:

  • Sizes: unlike the single sheet, a roll can be assigned a height value only (the width is considered "infinite")
  • Cost: see Roll

Custom

custom

A custom material can be defined by means of:

  • Custom shape: it is the shape of the material sheet, which can be provided as an SVG or DXF file, along with its unit of measure
  • Allowance: the allowance for this kind of sheet has a unique value applied to all its border, because on the irregular shape it is not possible to detect the axes along which to consider a "width" or a "height"
  • Part allowance: see Single sheet
  • Cost: this indicates the cost per unit of measure. The total cost of the sheet is automatically computed, based on the area of the shape provided

Leather

leather

This kind of material is specific for the leather and can be assigned some additional properties. The user can define:

  • Sizes: sizes are determined by the area of the material sheet, since - like the Custom sheet - its shape is irregular. The area value needs to be filled in with its associated unit of measure
  • Info: additional information that is specific for the leather, such as
    • Adjustment factor: it is a characteristic of the specific leather that defines how regular it is, the lower the better.
    • Quality grade: this percentage indicates the quality assigned to the material.
  • Part allowance: see Single sheet
  • Cost: this represent the cost per unit of measure. The total cost of the sheet is automatically computed, based on the area filled in

Leather calculation are fairly complicated, they are performed on an ideal piece of material. The method used is based on the russ and small publication. The pieces are nested and a scale area is computed. That scale area is then weighted against the given data and the overall yield is calculated. To see more information see the relative page