Calibration
The shape of the CMM calibration piece is....
Spherical
Vickers hardness testers use a ________ shaped indenter.
Square base pyramid.
stiffness of our surface plate is a function of the _______ of the thickness.
cube (^3)
When would you use a non-contact type CMM probe?
When the object being measured can be manipulated by a contact probe.
What is the purpose of the skid in a skid-type profilometer?
it establishes a datum
CRT's CMM uses this category and type probe...
Contact touch-trigger
What are the main three types of minerals that make up granite?
Quartz, alkali feldspar, plagioclase.
Surface texture, roundness (geometry), material, hardness, surface metallurgy
Why would you want a rough-type surface?
lubrication
a uniform error that is in every measurement taken with that instrument.
CMM reads displacement from one of these four things...
precision scales, measuring devices, encoders, transducers
What is the 4:1 ratio?
a gage must be compared to a check-standard of 25% or less of the total tolerance of the gage.
What are the two components of flatness?
Waviness and Roughness.
What is the artillery method of calibration/error finding?
This method checks large increments to small increments until an error or deviation is perceived. Once noticed, the error can be more finely defined without over-inspecting the rest of the scale.
What is a determinant error?
One that can be evaluated with a logical process.
It counts the revolutions of the main dial and is for reference.
What is the 10:1 ratio?
the rule that states an instrument should have a discrimination of 1/10th the tolerance being measured.
What is a class 2, grade AA granite surface plate?
medium wear resistance, laboratory grade
Where did the study of surface metrology stem from?
The study of friction and bearings.
What is the purpose of preload during a hardness test?
Getting through the surface layer.
lever arms do what in a dial indicator?
Amplify
What is a continuous dial indicator?
One that measures from 0 to a set value
What do you need to know to use a roughness comparator tool?
The method of manufacture
What are the five styles of CMMs?
Cantilever, bridge, column, horizontal arm, gantry