Used 2000 CINCINNATI #350-20 RK | GRINDERS, CENTERLESS

CINCINNATI 350-20 TWIN GRIP RK SERIES MACHINE
S/N HK-31075     Year:  2000

STANDARD CATALOG SPECIFICATIONS
Grinding Wheel
Diameter maximum/minimum…………………………….. 24/17" (609/431mm)
Hole size……………………………………………………… 12" (304mm)
Regulating Wheel
Diameter maximum/minimum……………………….. 14/11" (355/279mm)
Hole size…………………………………………………………… 6" (152mm)
Machine Capacities – Standard Equipment
Work diameter……………………………………….. 1/2 to 6" (12,7 to 152mm)
Grinding wheel width………………………………………... 20" max. (508mm)
Regulating wheel width……………………………………… 20" max. (508mm)
Main drive horse power……………………………………… 50 HP (37 KW)
SIMPLY PRODUCTIVE
The RK Series proves outstanding precision.  Simple mechanical design combines with advanced features to make these machines remarkably accurate (0.1 micron).
Cincinnati Milacron has reduced the number of parts in the RK Series by 42% while improving grinding performance.  Pneumatics have been removed and most hydraulics have been replaced by smooth running electric drives.  Complex computer programming has been replaced by simple state-of-the-art operator controls.  (See options for additional controls selections).
Mechanical design of the RK Series helps keep set up easy.  The grinding wheel position is fixed, rigidly mounted to the machine bed.  An upper/lower slide arrangement, under the regulating wheel and work rest, swivel together with a single adjustment for quick, accurate adjustment of taper or wheel contact.

BASIC 350-20 RK CENTERLESS MACHINE DESCRIPTION
• Epoxy granite machine base.  1,000,000 lbs. static stiffness.
• Advanced design upper and lower slide utilizing an anti-friction way system.
 T.H.K. slides.
• Swivel plate with anti-backlash single screw adjustment.
• Regulating wheel housing with double-ended spindle support.
• Variable speed regulating wheel drive system (15-300 RPM) AC brushless Servo motor, RPM selectable.
• "FILMATIC" double ended support (TWIN GRIP) style grinding wheel spindle bearing system with hydrostatic lift at spindle start up.
• Single axis slide drive, utilizing precision backlash-free, preloaded heavy duty 2.500"  (63.5mm) diameter ball screw with A.C. brushless Servomotor, providing two-way compensation, and 0.000004" (0.1 micron) resolution.
• Rear mounted control station provides slide axis compensation push buttons for machine size adjustments.  This control station also includes an emergency stop push button.
• Externally mounted main drive motor and hydraulic pump unit.
• Machine arranged for central coolant supply.
• Standard machine operation using "INCH" measure.
• Electrical equipment wired in accordance with "ANSI/NFPA 79 Electrical Standards for Metal Working Machine Tools."  Motors are 460 volts, 3 phase, 60 Hz. A.C.
• Machine mounted electrical cabinet.
• The Servo motors are controlled by a state-of-the-art multi-axis dedicated motion controller (DMC).  Logic functions are controlled by G.E. Fanuc Controls.
(See Electrical Options).

PRECISION COMPONENTS
RK machines are built on an epoxy granite base, selected for its superior rigidity, vibration damping and thermal characteristics which provides the base with one million pounds static stiffness.
RK Centerless slides combine anti-friction ways, brushless AC servo motors, precision ball screws and digital feed back.  The results give you two-way compensation with 0.000004" (0.1 micron) resolution.
The RK Series CNC Grinding Wheel Dresser Offers:
• 2-Axis DMC (Dedicated Motion Control).
• CNC Profile tailoring.
• Step relation control.
• Anti-friction slides.
• 0.000004" (0.1 micron) Resolution.
• Rigid design for accurate, responsive operation.

Grinding wheel truing attachment "Camless Design" with anti-friction way system and ball screws.  Selectable rate Servo motor for the traverse axis and Servo motor diamond axis providing 0.000004" (0.1 micron) resolution.  Includes a 7/16" (11.1 mm) shank diamond holder.

Regulating wheel truing attachment with anti-friction way system and ball screws for the traverse axis.  Selectable rate Servo motor traverse axis with manual compensation for the diamond axis.  Includes a 7/16" (11.1 mm) shank diamond holder.

FILMATIC grinding wheel spindle bearings with hydrostatic lift provide long lasting, hydrodynamic, self-centering support which is consistent under varying grinding loads.  Rotational accuracy is 0.000004" (0.1 micron).  The regulating wheel is rigidly supported at both ends by special hydrodynamic bearings.

GRINDING WHEEL DRIVE
Variable speed AC grinding wheel drive is available to grind at a constant surface speed with the DMC.  Alternate, higher horsepower motors can also be furnished at additional cost.

COMMONALITY AND SUPPORT
If you have Cincinnati Centerless machines, you will be able to use most of your existing work support tooling on the new RK Series machines.

EQUIPPED WITH
SBS Balancer on grinding wheel spindle.
Siemens Simodrive 611 Controls.
CNC Dressers.
Heidenhain scales.
Attached electrical panel with air conditioner.
Externally mounted main drive motor and hydraulic pump unit.
50 H.P. Spindle motor.

OPTIONS CONTROLS
Fanuc 18 I.
Allen Bradley Control Logix.
Siemens 840 D.
Others available upon request.

Specifications are deemed accurate, however, subject to verification or prior sale.