Variable gages are also indicated for three additional types of applications: where you can expect to optimize tool life and uptime by gaging the part and making corresponding machine adjustments; where scrap rates and loss of productivity are high; and where process variation is expected to be relatively high - measured by a CpK or CP of 1.33 or less.
Finally, air-to-electronic gaging systems should be considered for applications where low initial investment is a requirement and flexibility is not.
An optical gaging system utilizes light to make dimensional, geometrical and positional checks on production parts.
Allison Engine Co, formerly Allison Gas Turbine Division, General Motors, saw that Kurt's modular gaging could provide other benefits as well.
Allison, a manufacturer of aircraft engines, had a new turbine blade program that required accurate fixture gaging to measure very complex geometries on a family of turbine blades.
In applications where there is interference between the part and the gaging contacts, the air/spring actuated linear bearing slide is used.
"US automakers have always thought in terms of hard, dedicated gaging
. Shorter product development cycles, increasing quality requirements, and eroding profit margins are changing that mentality.
The transmission hub and gear gage communicates with the turning centers and grinders through a computer-aided gaging (CAG) system.
"The lathe control system is programmed to compensate a specific amount when it receives a signal from the gaging system," said Mr Krull.
You need gaging that is stable, reliable, and stays set once its calibrated.
With turning (particularly hard turning) challenging grinding, in-process gaging is moving into turning.
Many people doing statistics today are familiar with numbers but not with gaging. So they need a gage that is easy to read and displays actual sizes.
Much of the gaging function is being transferred from inspection rooms and departments, out to machine stations on the factory floor.
Gaging systems range from the simple hand-held plug gage with air column or digital readout to more complex, fully automated systems with distributed processing of related activities such as machine monitoring, robotics, and information management.
In grinding, "In-process gaging" refers to simultaneous measurement: While metal is being removed, a probe or sensing mechanism continuously measures the workpiece.