BIG-PLUS Taper Conversion

BIG PLUS® tapers deliver the precision and rigidity demanded by today’s most demanding machining applications—but not every spindle shop can support them properly. In this short video, Moe St. Onge of SPS Spindle explains how we helped an aerospace customer upgrade a 50-taper boring mill to a BIG-PLUS taper—without removing the machine from their facility. SPS Spindle is one of the only licensed spindle rebuilders qualified to perform BIG-PLUS work, and the only company capable of on-site BIG-PLUS taper grinding. You’ll see how our team converts conventional tapers to BIG-PLUS, performs precision taper and face grinding directly on-site, and uses certified Big Daishowa gauging to verify proper BIG-PLUS fit. The result is improved spindle performance that allows customers—especially those in aerospace and other high-precision industries—to achieve tighter tolerances, long-reach accuracy, and reduced concerns about taper reliability, all while minimizing machine downtime.