Basic knowledge about gauges
What is a gage?
A gage is a special mechanism used to measure the dimensional and form tolerances of a part.
On-line inspection of parts at the production site.
Inspection of parts by visual inspection or special inspection apparatus by mounting them on a gage as required.
Inspection tools include special fixtures and inspection accessories used to check the size, shape and location characteristics of the product.
Checking fixture classification: metrology inspection tools, functional inspection tools, positioning inspection tools, inspection tool holders.
Checking fixture materials: aluminum/glass/plastic parts inspection tools/carbon fiber, etc.
Sample plate: processed according to the measured part type, used to measure the measured part type.
Cardboard: processed according to the measured part type surface, used to measure the measured part type or used to fix the parts.
General gauges: generally refers to calipers, block gauge, ring gauge, stopper, micrometer, angle gauge plate and other gauges special gauges: special gauges with special parts.
Gauge: standard structural gauges used to measure the type and structure of the measured parts.
Standard sample: regularly calibrated, used in the production process plays the role of the ruler and standard parts.
Positioning datum: used only for the position datum of the product on the inspection tool
Design datum: the datum determined by the designer on the drawing for measurement and processing
Zero block (to zero block): used for calibration gauges
Degrees of freedom: Any object has six degrees of freedom, translation along three axes and rotation around three axes.
Degree of freedom constraint: constrain all the degrees of freedom of an object, the object space has the only determined position.
Inspection tool tolerance principle: the principle of one-tenth of the product tolerance.
Checker wear compensation: the principle of one-twentieth of the product tolerance.
Sources of deviation
Human observation
Clamping
Temperature
Wear
Humidity
Factors affecting the checker.
Calibration method, frequency
Calibration accuracy
Procurement cost
Operability, clamping difficulty
Part shape, weight, etc.
Temperature, humidity
Lighting