Digital Gage Indicators First in Their Size Spec Class
The L.S. Starrett Co. has introduced a range of digital electronic indicators conforming to true AGD (American Gage Design) Group 1 dimensions, providing the ability to replace traditional mechanical indicating applications in the smallest AGD size specification class. Starrett 2700 electronic indicators are the first digital gages to match true AGD Group 1 dimensions (1.70"/43 mm diameter), according to the company.
These indicators feature a 1.70" diameter, 270-degree rotating bezel, allowing for different user viewing preferences. The gages are available in two displays: a single LCD numeric IQ model (the largest of its class) with low battery warning and programmable ratios, and a numeric/analog AD model showing the two displays simultaneously.
Gages feature a 0.400" (10-mm) travel, accuracy of ±0.0001" (0.002 mm) on the F2715 models and accuracy of ±0.0002" (0.004 mm) on the F2714 models. The gages can store and view as many as 200 readings internally. Stored readings can be downloaded with included software and a USB cable. The batteries can last up to 3,000 hours under typical use. Gages are output-compatible for SPC documentation via cable or wirelessly using a Starrett DataSure data collection device.Indicators have a 3/8" (0.375") stem with 4-48 thread and are available in four models based on display readout format and resolutions. Gage functions are said to be easy to operate and include: absolute true position, travel reverse, total indicator runout, tolerance settings, floating zero, inch-millimeter conversion, three hold functions (max/min/freeze) and auto off.
Virtually every machine tool builder lists, as part of a machine's specification, accuracy and repeatability figures. What's generally not given is the method used to arrive at the figures. Though these methods are defined in linear positioning standards, not all builders use the same standards.
Different instruments (and different operators) are prone to different errors.
While countersunk and chamfered holes are similar in appearance, functionally they are quite different. Consequently, different gages exist to serve these different functional requirements.