NBN EN 12890 : 2000

Foreword
Introduction
1. Scope
2. Normative references
3. Terms and definitions
4. Order information and delivery conditions
   4.1 General
   4.2 Points to be agreed
   4.3 Mandatory information
5. Classification
6. Specifications
   6.1 General
   6.2 Designation
7. Manufacturing requirements
   7.1 Materials
   7.2 Manufacture
   7.3 Contractions
   7.4 Tapers
   7.5 Clearances
   7.6 Required machining allowances (RMA)
   7.7 Dimensional tolerances
   7.8 Surface coating
8. Quality control
9. Usage
   9.1 General
   9.2 Identification
   9.3 Modifications
   9.4 Repair and refurbishment
   9.5 Protection and packaging for transportation and storage
Table 1 - Quality classes for patterns, pattern equipment and
          coreboxes
Table 2 - Quality classes - patterns, pattern equipment and
          coreboxes made of wood
Table 3 - Quality classes - patterns, pattern equipment and
          coreboxes made of metal
Table 4 - Quality classes - patterns, pattern equipment ant
          coreboxes made of plastic
Table 5 - Characteristics of patterns and pattern equipment
Table 6 - Characteristics of coreboxes
Table 7 - Tapers
Table 8 - Surface coatings (painting and colour-coding of
          patterns, pattern equipment and coreboxes
Figure 1 Examples of clearance of core prints (vertical core)
Figure 2 Example of clearances of core prints (horizontal
          core)
Figure 3 Values of clearances of core prints (for moulding
          with horizontal joint surface)
Annex A (informative) Guidelines on the use of tables in this
          standard
Annex B (informative) Reference values for linear casting
          contractions
Bibliography

Requirements for patterns, pattern equipment and coreboxes for the production of sand moulds and/or sand cores are specified in this Standard. It does not define equipment for the production of lost patterns, permanent moulds and die casting dies. It also does not define requirements for ancillary items used in the making of pattern equipment (such as dowels, screws, etc).