Terms in this set (22)
Test Accuracy Ratio
ratio of the tolerance of the unit divided
by the tolerance of the reference standard
today 4:1 or 3:1 is common
Test uncertainty ratio
ratio of the span of tolerance of a measurement quanity subject to calirbation, to twice the 95% uncertaintet of the measurement process used for calibration.l
inspection of product a the vendor's plant
inspection of purchased finish parts from a supplier
inspection at the time of the internal machine set up. set-up approval, first piece inspection, first article inspection
inspection encompassing a number of production operations. The inspector visits the production location at either a random or fixed interval.
Certificate fo complaince
identity of the material
specific requirements being certified
traceable to specific data
signed by an authorized person
Certificate of Analysis
reveals actual values of the quanity of reference
'listing of each test performed customer requirement
can check material thickness, conductivity,
adaptable at 100% high speed applications
only useful for conducitve materials. Calibration is required. Part thickness and penetration depth can pose problems
simple, accurate, inexpensive technique to locate surface defects. Works on non-metallic and nonmagnetic materials.
Does not work for porous material. Works on surface defects only. faster and more economical than
can detect surface and subsurface defects in ferromagnetic parts. Portable
Used foe ferromagentic parts only. magnetism may have to be two directinal to find all disconitunties. parts may require demagnetizing.
wet particles- used for fine surface cracks
dry - subsurface defects.
used for thickness measurement, moisture content and chemical composition of both liquids and solids.
cannot detect subsurface defects in metal
relative size and orientation of internal defects. Can measure thicknesses difficult to reach with mechanical methods.
complex part geometries present difficulties. Requires skilled operators and good test standards. Coupling materials such as water petroleum jelly must be used.
internal defects in matals. Some effect permanent records. Provide continual product movement and rapid decision
high cost, trained technician,
not applicable to thin parts.
inherent safety risk
can be used on moving object,
no permanent record is kept and the human eye must judgment
lack of ductility.
allows material to deform very little prior to fracture
compound or mixture moves through a chromatography column which absorbs and then releases compoenents of the mixture
outputs a concentration as a function of time.
dodge romig tables
attribute plans for effective sampling inspection when the process average is known
assume all rejected lots are 100 percent inspected and the defectives are replaced with good products
constructed to minimize the average total insecption per lot for a gven process average
samples taken from groups/ selected chunks
zero defect sampling
inspect 100% until x units, and then sampling until defect is found.
one of 3 choices, pass, reject or keep sampling. keep sampling until reject or accept limit is reached,
no set sample size.\
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