In the 1980's, spindle runout of drills was generally measured statically by manually rotating the spindle and mechanically measuring runout. Then, methods to measure spindle runout dynamically became popularized as electronic equipment made by companies such as Lion Precision became available to measure runout at full operational speed. I am looking for information about when this transition took place, and what the industry practice was in 1989 (ie. - were runout specifications for drills given by manufacturers usually a static measurement or a dynamic measurement). Thanks *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************