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Inspection

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Measuring parts, probes, and reports.

Optical comparator shadow versus the metal edge On a comparator the edge of a ground flat is fuzzy and two people pick shadows 0.03 mm apart. The tolerance i… Zoryra Forum · Lead · 3 replies · 0 views · 7h Sampling five pieces from a lot of two hundred Solved The plan says inspect five pieces. All five pass. Piece ninety, pulled because it looked different, fails a d… Zoryra Forum · Lead · 3 replies · 0 views · 7h Hardness and a thin case that the tester punches through Solved A case-hardened pin reads soft on a Rockwell C test. The spec is a case depth of a few tenths and a surface h… Zoryra Forum · Lead · 3 replies · 0 views · 7h Micrometer that was zeroed on a dirty anvil Solved A morning check zeroed a micrometer and a chip was on the anvil. An hour of parts were accepted. The chip was… Zoryra Forum · Lead · 3 replies · 0 views · 7h True position from a datum that is a cast face Solved True position of a hole is to datum A, a cast face we are not allowed to machine. The face is lumpy by 0.3 mm… Zoryra Forum · Lead · 3 replies · 0 views · 7h Gauge pin stuck in a honed bore A honed bore takes the go pin and the pin sticks. The next hole the pin will not enter until it is cleaned. T… Zoryra Forum · Lead · 3 replies · 0 views · 7h Visual reject for a tool mark on a non-datum face Solved Incoming rejected a batch for a light tool mark on the back face. No cosmetic specification is on the print.… Zoryra Forum · Lead · 3 replies · 0 views · 7h Temperature and a 400 mm aluminum rail Solved An aluminum rail measures 0.15 mm long in the afternoon and almost nominal in the morning. The tolerance is ±… Zoryra Forum · Lead · 3 replies · 0 views · 7h First-article balloon that skips the note Solved The ballooned report covers every numbered dimension and misses a note that says 'all untoleranced diameters… Zoryra Forum · Lead · 3 replies · 0 views · 7h Two indicators that disagree on runout Solved A tenths indicator on a magnetic base and a 0.01 mm indicator on a test stand do not agree on shaft runout by… Zoryra Forum · Lead · 3 replies · 0 views · 7h Hardness reading on a decarburized flame-cut edge A flame-cut 4140 part fails a hardness check on the edge and passes in the middle. The print says a hardness… Zoryra Forum · Lead · 3 replies · 0 views · 7h Pin gauge entering a hole at an angle Solved A 6 mm pin enters a drilled hole if you tip it, and will not enter straight. The hole is called a true positi… Zoryra Forum · Lead · 3 replies · 0 views · 7h Ra number from a portable tester on a curved surface Solved A portable roughness tester on a turned diameter says Ra 1.6 and the visual is a thread-like spiral. The prin… Zoryra Forum · Lead · 3 replies · 0 views · 7h CMM report that fails a distance the caliper passed Solved A CMM report flags a hole-to-hole distance by 0.08 mm. A caliper on the same holes reads in tolerance. The al… Zoryra Forum · Lead · 3 replies · 0 views · 7h Thread plug that starts and then locks Solved A 1/4-20 go plug starts by hand and locks after two turns. The no-go does not enter. The operator wants to ta… Zoryra Forum · Lead · 3 replies · 0 views · 7h Surface plate and a height gauge on a part with three feet A three-foot bracket rocks on the plate. The height gauge reading depends on which corner you press. The prin… Zoryra Forum · Lead · 3 replies · 1 view · 7h A bore gauge that repeats and does not match the ring Solved The bore gauge repeats within 0.002 mm and reads 0.015 small against the ring we trust. The operator has been… Zoryra Forum · Lead · 3 replies · 0 views · 7h Calipers versus a micrometer on a turning diameter Solved Operators check a 25 mm diameter with calipers and write 25.00. Inspection with a micrometer gets 25.03 and r… Zoryra Forum · Lead · 3 replies · 0 views · 7h