Thin-walled parts, long boring bars and unsupported workpieces – parts with irregular length-to-diameter ratios – create the situation for chatter. In an effort to eliminate chatter, Okuma developed Harmonic Spindle Speed Control (HSSC), which gives you the ability to change spindle speed automatically, according to pre-set parameters, effectively combating harmonics before they start.

Each Okuma machine is tuned to eliminate dimensional variation, control errors, and the need for external compensation devices. The HSSC is activated by an M-Code and turned off by another M-Code. There are two parameters involved. One will set the change in rpm that you wish to see. For example, if set to 50, the spindle speed will rise to 25 rpm above the commanded rpm and then fall to 25 rpm below the commanded rpm. The second parameter affects the rate of change (time) in which this change in rpm occurs. No more standing by to change the Spindle Override.

A seemingly simple technology feature, HSSC has the power to eliminate expensive tooling, work-holding devices or even a steady-rest. Less equipment to purchase, fewer elements to potentially fail – just efficient Okuma technology that gets the job done.