TURNING
INTELLIGENT ADD-ONS
Choosing the correct turning approach also means looking
at all the options for better performance. CNC lathes from
Okuma America ( okuma.com ) with a P200 control or higher
have harmonic spindle-speed control settings that, when
programmed, automatically adjust spindle speed to prevent
vibration buildup before the onset of chatter. Harmonic
spindle speed control has largely been manual, but with a
few lines of NC code, parameters can be pre-set to control
amplitude, interval time and pitch in rpm changes. Shaft
parts out of alloyed steels or with high L/D ratios can be
good candidates.
Internal turning can mean threading, and in this case, Okuma
provides a variable that can override automated threading
cycles to manually change rpm to maintain thread pitch. The
reason is the same, to avoid any buildup of harmonics before
chatter occurs.
In some instances, the utilization of high-pressure coolant
systems can make a major diference in productivity. In a
recent test, the use of a 1,000-psi coolant system on an Okuma
LB3000 CNC turning center reduced cycle time from 24.01
minutes to 12.30 minutes. What's more, it greatly aided in chip
clearing compared to the low-pressure approach.
An Okuma LB3000 turning center. The use of high-pressure
coolant on equipment like this can greatly increase
productivity in turning operations.
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