TAKE 5 Five ways to maintain machine performance and tool life
Alan Miller
2. Test Static Accuracy Another way to confirm spindle performance or ensure that bearings are holding up is to inspect the accuracy of spindle movement. Any runout in a spindle will be amplified as it extends through the tool and into the part. Similarly, if Z-axis movement is not parallel, users will see the resulting imperfections on parts. I recommend using a test bar that’s inserted into the spindle and a touch probe to measure movement. Simply spinning the spindle slowly or moving it along the Z-axis while the probe is on the bar will reveal any issues.
Machine maintenance is critical to metalcutting. Because of their manual nature, certain tasks can be hard and time- consuming, taking up valuable spindle time. These efforts are necessary, however, to ensure consistent performance of machinery and tooling. Left to work for extended periods without attention, spindles and other machine components may pass on problems to parts and cutting tools. I often see how frustratingly difficult these issues are to diagnose. The best plan is to schedule routine maintenance and testing, especially when applying premium tools. What many people first think is tool trouble frequently can be resolved with cleaning, more vigilant monitoring of machinery or both. The following suggestions are for maintenance and monitoring. 1. Verify Taper Accuracy The spindle is a key link in the machining chain. Whether it’s an errant chip, fluid buildup or heating wear, part quality and machining efficiency can be hurt. Visual checks are not enough, and neither is an occasional wipe-down. This is where a taper gage comes in handy. By applying a blue layout dye, inserting it into the spindle and removing it, inconsistencies that cause poor contact of the spindle taper with tool holders are revealed. This information enables targeted cleaning and repair.
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