TOLERANCE STANDARDPrepared (also subject responsible if other) 1 (7) No. UABUKR 1034-012 Uen Approved Checked EAB/FJB/GR (T. Andersson) Date Rev 2014-05-19 G Reference SURFACE APPEARANCE Abstract This describes a method for specifying limiting values for tolerance requirements of surface appearance in the product specification and with reference to LZT 142 0001 (reference standard) for evaluation distance. The test method is not described here. It is described in 1729-505. Application Used for flat surfaces of: • not surface coated metals, except sand cast surfaces • painted surfaces • metal plated surfaces • anodized surfaces • plastic mouldings surfaces Use for other surfaces: Specifying requirements for other surfaces for which this method is not directly applicable due to the geometry. For example surfaces specified as concave or convex where the distance and light conditions will wary may need an additional specific instruction for how to handle the inspection distance and light conditions. Contents 1 2 3 4 5 6 7 General Tolerance notation Tolerance requirements Inspection of surface appearance References Reference standard reproduction Annex 2 2 3 5 5 6 7 The reference standard is reproduced in section 6. 0. B. The evaluation distance for a specified quality grade is the distance where in a line pair the line having the larger letters can be read but not the line having the smaller letters. By the use of the reference standard for definition of the evaluation distance differences in visual acuity of different observers are balanced. 2. The letter A denotes requirements of the general condition of the surface. Note that the original reference standard LZT 142 0001 shall be used for inspection not the reproduction. The letter B requirements with reference to weld marks etc.5A1 (half of the evaluation distance for quality grade 1 shall apply) . A4.TOLERANCE STANDARD Prepared (also subject responsible if other) 2 (7) No. Examples of tolerance notations. Several quality grades of surface appearance exist corresponding to different evaluation distance. 2 TOLERANCE NOTATION Tolerance for surface appearance is indicated on the product specification (drawing) by a combined letter and number code. See also clause 3. 2. Example.2 QUALITY GRADE The quality grade notation by the numbers 1 to 7 where the number 1 to 7 refer to the corresponding pair of lines on the reference standard LZT 142 0001. The specified number defines the evaluation distance that shall be applied. The letter D requirements apply for corrosion on cut edges of pre-treated sheet steel. C and D. UABUKR 1034-012 Uen Approved Checked EAB/FJB/GR (T. A4B5 A multiple in the notation implies that the corresponding increase or decrease of the evaluation distance shall be applied. The letters shall be given in alphabetical order followed by the quality grade. Andersson) 1 Date Rev 2014-05-19 G Reference GENERAL Surface appearance refers in this instruction to an aesthetic concept and to the occurrence of disturbing surface defects caused in processing and handling. The letter C requirements apply for smooth painted surfaces. The letters gives the type notation and the numbers the quality grade.1 TYPE NOTATION The type notation by the letters A. 1.1 Tolerance requirement A At the specified evaluation distance the surface shall appear free from swellings. stains. Andersson) Date Rev 2014-05-19 G 3 TOLERANCE REQUIREMENTS 3. 3.1 Tolerance requirement A . At the specified evaluation distance the surface shall appear free from orange peel texture. UABUKR 1034-012 Uen Approved Checked EAB/FJB/GR (T. other foreign substances. cuts.3.1 METAL SURFACES. isolated solid impurities appearing as granules.2 Tolerance requirement B At the specified evaluation distance the surface shall appear free from bubbles (due to boiling). pin-holes and craters or other small surface defects.2.1. cavities. discoloration.2.3 METAL PLATED SURFACES 3. scores. dents. weld marks and soldering marks and also from bend scores parallel to the bending line. NOT SURFACE COATED Reference (This do not apply to surfaces of sand castings) 3. and scratches. 3. 3. If no tolerance requirements are found in the quality specification the following shall apply.TOLERANCE STANDARD Prepared (also subject responsible if other) 3 (7) No. dust.2 PAINTED SURFACES The tolerance requirements for painted surfaces (lacquer coatings) are laid down in quality specification for respective lacquering. For example.1 Tolerance requirement A At the specified evaluation distance the surface shall appear free from dirt. 3.2 Tolerance requirement B At the specified evaluation distance the surface shall appear free from weld seams. fixing marks. bulges and waviness. discoloration and runs. also such as may be caused by defects of the basis material. 3. 105 86-MZY383 20 Uen.3 Tolerance requirement C This only applies for smooth surfaces. 3.2. stains.5. and milkiness in the clear lacquering if any. UABUKR 1034-012 Uen Approved Checked EAB/FJB/GR (T. 3.1 Tolerance requirement A At the specified evaluation distance the surfaces shall appear free from dirt. The colour of the dyed anodic coatings must not show a visible difference from the colour standard specified. cuts. other foreign substances. . fixing marks. embedded or loose solid particles. weld marks and soldering marks and also from bend scores parallel to the bending line. burnt edges. dents.2 Tolerance requirement B At the specified evaluation distance the surface shall appear free from weld seams. Andersson) Date Rev 2014-05-19 G Reference At the specified evaluation distance the surface shall appear free from blisters. 3. Minor shades in lightness owing to local variations in the base metal are permitted. bulges and waviness. dullness. scratches. cuts. granular deposits. shades. ejector marks and flash lines. dust.TOLERANCE STANDARD Prepared (also subject responsible if other) 4 (7) No. and scratches. scores. fixing marks. other foreign substances. scores.2 Tolerance requirement B At the specified evaluation distance the surface shall appear free from weld seams. 3. sink marks.4.3. cavities. cuts.1 Tolerance requirement A At the specified evaluation distance the surface shall appear free from dirt.5 SURFACE ON PLASTIC MOULDINGS 3. stains. cavities.3. cavities. and scratches. Marks from unclean material shall not be visible on transparent material surfaces. dust. bulges and waviness. dust.4 ANODIZED SURFACES 3. The same applies unless otherwise stated for marks from gates. burn marks etc. 3. dents. discoloration. stains. discoloration.4. other foreign substances.3 Tolerance requirement D At the specified evaluation distance the cut edges shall appear free from corrosion and discoloration due to corrosion by-products. 3. weld marks and soldering marks and also from bend scores parallel to the bending line and discoloration. And the surface shall also appear free from dirt. 1 cannot be reckoned with but the deviations should in many cases be small. good light conditions without reflecting light in the inspection place is assumed. The reference standard may also be used in workshop conditions. However. 5 REFERENCES Supplementary document 1729-505 Uen Evaluation of surface appearance . In case of dispute inspection according to section 4. UABUKR 1034-012 Uen Approved Checked EAB/FJB/GR (T. With some experience the inspector should recognise not acceptable surface defects thus reducing the use of the method in section 4. Depending of the manufacturing batch size and by experience a suitable number of single object samples has to be inspected to give a representative perception of the whole batch.1 to cases of doubt.2 APPLICATION DIRECTIVES The directives in this section are not mandatory but have been included to prevent unnecessarily expensive inspection.1 TEST METHOD Reference The inspection shall be carried out according to test instruction 1729-505 Uen. Andersson) Date Rev 2014-05-19 G 4 INSPECTION OF SURFACE APPEARANCE 4.1 shall always be applied. Identical results compared to the method in section 4.TOLERANCE STANDARD Prepared (also subject responsible if other) 5 (7) No. If the result from this inspection is approved the rest of the batch can be inspected in normal workshop conditions. 4. Andersson) 6 Date Rev 2014-05-19 G Reference REFERENCE STANDARD REPRODUCTION Just for information. For inspection original reference standard marked LZT 142 0001 shall be used.TOLERANCE STANDARD Prepared (also subject responsible if other) No. Not for use at Inspection. 6 (7) . UABUKR 1034-012 Uen Approved Checked EAB/FJB/GR (T. Andersson) 7 Date Rev 2014-05-19 G Reference DOCUMENT CHANGE INFORMATION The document is rewritten.TOLERANCE STANDARD Prepared (also subject responsible if other) 7 (7) No. discoloration and stains are added in clause 3. Rev. Tolerance notations are added in clause 3.G Type notation D added for cut edge corrosion on plate sheet steel.3. 3.5. 3. UABUKR 1034-012 Uen Approved Checked EAB/FJB/GR (T.1 and 3.1.1.4. Dust. .1. other foreign substances.2.1.