For this reason, Lockhart normally reserves pneumatics as an option for the end of a line after finishing takes place. To produce a cylinder, automakers often use a single-point boring tool to machine the bore to size and then hone it to chop off the peaks. Pneumatic and contact gages will give the same results at the honing stage, but could give different readings after the boring operation, depending on tool wear and the feed rate. Yet another limitation of pneumatics in several applications is the settling time. Because air is a compressible fluid, there is a slight lag for the air to compress and respond.
Electronic feedback is faster.
On most transfer lines, however, the difference in the response times is negligible because there is usually plenty of time to make the measurement. Use but don t abuse A costly misuse of in-line gaging is measuring every dimension on the print, rather than making just enough measurements to control the process. When a tool is cutting five diameters on a shaft, checking all five diameters is overkill. Measuring every dimension on a transfer machine is ludicrous. Measure the critical features for process control features that you might have a tough time holding because of machine creep or tool wear.