14 What is Roughness? Answer the question relating it to the ABNT NBR 8004 standard (based on ISO 1302)
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A surface texture symbol must identify roughness height average, the sampling length, the lay symbol, and the minimum amount of material that must be removed. If a value is not specified, then fill in the blank with N/A. The first five are in the U.S. customary system and the second five are in the metric system. Minimum Maximum Material Roughness Sampling Lay Symbol Removal Average Length US 1. 125 0.05 2. 125 0.05 3. 250 0.05 4. 250 0.05 5. 250 0.05 Metric 6. 1.6 0.8 7. 25/R 0.8 8. 12.5 0.5 9. 3.2 0.8 10. 6.3 0.4
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What are the differences between Runout and surface roughness? When do you apply Circular Runout or Total Runout? What are some examples?
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In the measurement of surface roughness, the height of the successive 10 peaks and troughs were measured from a drum and are 33, 25, 30, 19, 22, 18, 27, 29 and 20 microns. If these measurements were obtained on 10 mm length. Determine CLA and RMS value of the roughness
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