Two-Axis Grinder Features Ballscrew Drive, Rigid Construction
Eastec 2019: Okamoto’s ACC-818NC is a full-function, two-axis simultaneous CNC form grinder ideal for surface, slot, step, form and contour grinding, now available with a ballscrew table drive enabling precise positioning.
Okamoto’s ACC-818NC, a full-function, two-axis simultaneous CNC form grinder ideal for surface, slot, step, form and contour grinding, is now available with a ballscrew table drive enabling precise positioning. The machine can grind cylindrical components such as pins and punches and mold components such as core pins. In addition, the available indexing fixtures streamline grinding of punches and other components requiring two-axis simultaneous control.
Heavily ribbed Meehanite construction and full-contact, double-V ways promote true tracking and precise positioning. The rigid wheelhead assembly is said to ensure long-term accuracy and reliability even under demanding grinding conditions. A three-point diamond dresser includes one two-point angle dresser for form dressing and a one-point dresser for straight dressing. Table feed control boosts productivity by enabling simple setting of as many as five different stroke positions.
The grinder has a table working area (W × L) of 8" × 20" with a 265-lb load capacity. The 8" × 1" × 1.25" grinding wheel is driven by a 2-hp spindle.
User-friendly conversational programming is said to simplify setup and operation even for operators unfamiliar with CNCs. An RS232C port and PC card slot are standard. Some of the standard accessories include grinding wheel with adapter, spindle inverter, three-point table-mounted dresser, wheel guard with coolant nozzle and a table slash cover. Options include a fully enclosed splash guard, a coolant tank with a choice of filtration systems, an electromagnetic chuck, indexing devices and more.
The double-disc grinding process is consolidating its position in automotive applications but is moving into other industries. Double-disc grinders are now easier to operate, and they have added capabilities for control flexibility, precision process control, faster changeovers, and grinding of nontraditional materials.
It sounds like a contradiction in terms-between centers and centerless grinding on one machine. But for some categories of workpieces, it's a viable production process that can yield machining time reductions of 45 percent over separate grinding operations.
Roughing and finishing on a single machine, using a single setup, has appeal for most shops. The advantages in time savings and accuracy are obvious. Eliminating the transport of workpieces between machines, as well as the setup for those secondary operations, is a boon for throughput. Critical features that need to maintain dimensional relationships can be much more reliably produced if machined complete in one clamping.