Tooling_U Chapter 5 Vocab Flashcards
A small hard particle or crystal of material used to machine, grind, or finish a workpiece. These are capable of producing a very smooth surface finish, but still leave marks on the surface of a part
Abrasive Grains
The average distance between the peaks and valleys that characterize a particular surface. This describes the quality of the surface but does not detect waviness or flaws.
Average Roughness
What does the abbreviation Ra mean?
Average Roughness
A hardened steel tube, either fixed or removable, that is used to constrain, guide, or reduce friction. During Use, the inside of this is a dynamic surface, while the outside is static.
Bushing
The tension per unit length developed at a specified point in a surface and observed as a function of time.
Dynamic Surface Tension (SFT)
What does SFT stand for?
Dynamic Surface Tension
What is the definition of equilibrium?
a state of physical balance
A manufacturing process that involves pouring a heated liquid material into a hollow mold until the material cools into a solidified shape. This creates a surface with no clear lay.
Casting
The sample length on the surface of the part that a stylus-type instrument measures. This length is often marked on a part drawing.
Cutoff
A surface that moves or makes contact with other surfaces during use. For this, surface texture may affect how the surface rolls or slides against another surface.
Dynamic Surface
A type of comparison measurement during which inspectors use a fingernail to scratch the surface of the machine part. The inspectors then run that same fingernail along a surface replica block to compare its surface roughness to the roughness of the part.
Fingernail Test
The overall direction of the pattern created by the production process. This cannot be measured because it measures only a direction.
Lay
What does µ in stand for?
Microinches
What is the decimal equivalent of one microinch?
One-millionth of the U.S. Standard inch. Roughness is measure in microinches
The surface that represents the desired specifications on a part drawing. This does not have surface irregularities and is geometrically perfect.
Nominal Surface
What is the definition of nominal?
(of a role or status) existing in name only.
The point of maximum height. On the surface of the part, this lies above the average line, and the distance between this and the valleys determines average roughness.
Peaks
A small square plate that has standard surface characteristics. This device is used to calibrate the stylus-type instrument used to inspect surfaces
Precision Reference Specimen
A device that gathers measurement data from the workpiece. On a stylus-type instrument, this uses a stylus tip to contact the surface of a part.
Probe
A stylus-type device that measures surface roughness. This amplifies its signal to compensate for waviness and indicates only roughness.
Profilometer
The inherent, fine, closely spaced irregularities remain on a part surface after manufacturing. This is created by the production process.
Roughness
A surface that remains fixed in one place during use. It does not contact other surfaces in motion.
Static Surface
What is the definition of static?
lacking in movement, action, or change
The precision tip that records measurements. This is usually made of diamond and traces surface irregularities to measure surface roughness
Stylus
