Part quality begins at the spindle. Minimal overhang from the spindle bearings assure that spindle accuracy is transferred directly to the part being machined. Most brands of rotary tables use a collet adaptation chuck, moving the cutting several inches away from the spindle bearings. Hardinge rotary spindles are collet-ready for gripping parts of all shapes, sizes and materials. High-precision gripping options for the GD210LP include standard 16C collets, step chucks for larger diameters, Sure-Grip® expanding collets and custom collets with the use of an optional collet closer. Special accuracy FlexC™ collet systems, chucks and the precision-ground faceplate (included) will mount on the A2-5 spindle.
What does this mean to the programmer and machine operator? Higher accuracy jobs can be run, less tooling interference, length control options, internal gripping capability, no time-consuming fixtures, and lightweight alternatives for a heavy chuck. The added versatility and the ability to share tooling with other machines in the shop is highly advantageous.
The Hardinge enhanced GD210LP rotary table indexer provides rigidity, speed, accuracy, repeatability and flexibility in an affordable package. High stiffness and super rigidity are accomplished with large diameter bearings and a fail-safe clamp system allowing part weight of up to 220 pounds. Radial load testing indicated a stiffness of 4x greater than a competitive model. The GD210LP uses up to 233ft-lb/315Nm of clamping torque to handle off-center drilling, cross-axis milling and other high-force cutting applications. A fast clamp and release in milliseconds reduces cycle time. Hardinge’s hardened and ground steel cross-axis helical gear provides a longer life and continued accuracy when compared to softer gears and worm gears found in other brands. Based on true bidirectional testing, Hardinge guarantees ±15 arc-second accuracy and 10 arc-second repeatability.
“With this redesign, all of our rotary products incorporate the collet-ready spindle, states Al Comstock. The Hardinge GD210LP is the most flexible 210mm rotary solution on the market.” The GD210LP operates with a Hardinge servo control or it can be integrated to the machine via 4th axis. Options include a left- or right-hand motor mount, pneumatic collet closer, tailstock and a plate or cube trunnion for machining multiple parts. For smaller part production, look at the 160mm rotary table indexer with the Hardinge collet-ready 5C spindle.