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:: Figure 3. ExactDress uses acoustic emission sensing to monitor grinding wheel shape during dressing, matching it with a profle of a completed dressing operation. Pictured are the SB-5500 operator panel showing a sample grinding profle, a control board and three diferent AE sensor types. The SB-5500 platform also supports grinding wheel balancing functionality as an option. Implementation One example of a high precision AE product that is available to machine builders and job shops is Schmitt Industries' SBS AEMS (Acoustical Emission Monitoring System, Figure 2). Schmitt's AE-1000 acoustic monitor is a basic control unit that ofers crash protection and one programmable process limit that can be used for gap elimination or for monitoring grind quality. Te AE-1000 supports multiple inputs to provide separate gap and crash limits for one machine, or gap or crash detection for multiple grinding machines simultaneously. More advanced AE functionality is supported by Schmitt's ExactDress (Figure 3). Tis hardware/software product works with the company's SB-5500 grinding control platform to automate the dressing process by looking at the live acoustic emission signature of the dressing operation and comparing it with the profle of a known successful wheel dress. When there is a match, the system knows that the wheel is dressed correctly. Matching with an existing profle avoids the guesswork and over-dressing that typically result from manually implemented dressing cycles, improving quality while saving both time and cost. With ExactDress, users don't need to replace expensive CBN or diamond grinding wheels as often as they have in the past. To set up the controls, the system is "trained" with the overall gain, measurement scale and measurement window parameters for the machine, and the crash and gap sensitivity parameters are set for the particular wheel to be dressed. Ten, a successful dressing cycle is performed and the acoustic signature is recorded. Once the reference data set is completed and stored as a known good dress, the data can be used to evaluate subsequent dresses of the same process. CONTRIBUTOR Mark Astor is an application engineer at Schmitt Industries, supplier of test, measurement and process control systems for a variety of industrial and commercial applications. For more information: Schmitt Industries Inc. :: 503-227-7908 schmitt-ind.com Tread Grinding with 'A' Axis Accuracy and efciency requirements have increased with the surge in demand for parts with technically complex external and internal threads with large pitches. LINK :: short.productionmachining.com/A-Axis :: Figure 2. The SBS AE -1000 reduces air grinding time and alerts the operator of crash conditions by using acoustic detection technology. The control unit is shown with diferent AE sensors that can be selected based on machine confguration. TECH BRIEF productionmachining.com :: 29