Section 10 / 18
Metrology & Quality
From the caliper to the CMM, with surface texture explored to a depth found nowhere else: Ra, Rz, the Rk family and how to read a plateau-honed bore.
- Live
- 4
- Pages planned
- 51
- Subsections
- 5
- Release phase
- Phase 1 first three months
Live pages
- 10 Measuring instrumentsHardness testing: Brinell, Vickers, RockwellHow the three indentation tests work and what each one measures: the Brinell ball and its force-diameter index, the Vickers pyramid and its force ranges, the Rockwell scales and the depth reading; test times, test-piece thickness and spacing, designations, which test suits which part, Knoop and Leeb in brief, why converted hardness values are approximate, and how testers are verified.
- 10 Measuring instrumentsReading a vernier caliper and a micrometerHow a vernier scale turns a 1 mm scale into 0.05 or 0.02 mm, how a 0.5 mm screw and 50 thimble divisions give 0.01 mm, the reading steps with worked examples, and why resolution is not accuracy: Abbe’s principle, measuring force, parallax, temperature, standards and makers’ error limits.
- 10 Surface roughnessSurface roughness parameters — Ra, Rz, Rt and beyondWhat Ra, Rq, Rz, Rt, Rsk, Rku, RSm and Rmr actually measure, how to choose the cut-off, what changed when ISO 21920 replaced ISO 4287 and 4288, and the Ra each machining process typically reaches.
- 10 Surface roughnessRk, Rpk, Rvk — reading a plateau-honed surfaceWhy Ra cannot describe a cylinder bore, how the Abbott–Firestone curve is split into peaks, core and valleys under ISO 13565-2, what Rk, Rpk, Rvk, Mr1 and Mr2 mean, and published target values for engine bores and seal counter-surfaces.Under review
Section map
The subsections of this section and the number of pages planned in each. Pages go live in section order, all on the same template.
- 10.1Measurement basics0/7
- 10.2Measuring instruments2/14
- 10.3Surface roughness2/16
- 10.4Form and position measurement0/7
- 10.5Quality systems0/7
In production 4 of 51 planned pages are live. The figure on each subsection is pages live / pages planned.