• What Is Nesting?

The term Nesting signifies housing and building a house. It also possesses other meanings such as “suitable arrangement of pieces together.” Consider pieces as indicated in the table below:

Regardless of the fact that these pieces might have cross sections with different shapes, we suppose that they all have one type of cross section only to make the matter more comprehensible. If we want to estimate materials for these pieces (envisioning the fact that they all have one cross section), the fastest solution would be to multiply the length by the number and then calculate the total sum as the required total length. This is done as the table below:

Suppose that cross sections of these pieces are circular rods with 25-milimeter diameters. If the rods are fabricated in standard lengths with 6,000- or 12,000-milimeter lengths, the number of required standard lengths calculated through a simple division would be as follows:

Since 0.35 six-meter standard length or 0.67 twelve-meter one signifies nothing in rod fabrication and all standard lengths are fabricated similarly as six-meter or twelve-meter, we have to purchase 74 six-meter standard lengths or 37 twelve-meter ones to supply materials and not to encounter lack of them theoretically. The main question, however, is this:

 

“Will not we encounter lack of these materials if we supply them?”

 

The answer is “No.” Because:

First: cutting space is not taken into account in estimating the materials above.

Second: Unauthorized state of pieces in fabricating two- or three-part pieces are neglected. In other words, we have unconsciously supposed that pieces can be fabricated as more than one part and that their integrity is not necessary. Considering these two terms, the estimation above cannot be valid. In that case:

  • Do we need some six- or twelve-meter standard lengths so as to claim confidentially that we will not encounter lack of materials?
  • What sort of combination should we place in each standard length in order to encounter the least waste?
  • What combination of pieces should we place in each standard length in order to require the least …?

Providing responses for the three questions above is called “Nesting.”  Nesting can be summarized as:

 

Arrangement of similar pieces (regarding thickness, and … area) together, adhering to the least primary materials, and waste

 

If the objective in each arrangement and estimation is following the principles and rules of Nesting, the response will be yielded easily; particularly if there are considerable number and variety of pieces. In this case, the use of a software is inevitable.

Nesting can have the following forms:

  • One-Dimensional Nesting
  • Two-Dimensional Nesting

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