Centerless Grinder Options
Advancements in technology have brought many exciting changes to the way parts can be processed with centerless grinding. The centerless grinder can be highly automated, reducing operator influence on the finished part. Many electronic retrofits replace hydraulically controlled machine movement.
New Style Rate Valve
Improve dressing with better control of traverse rates. This simple to install and inexpensive retrofit provides more accurate dressing control. The upgrade, while still hydraulically controlled, is an improvement from the standard Cincinnati rate valve, providing a reduction in maintenance issues.
The rate valve meters the flow out of the cylinder or Accudrive motor, creating constant traverse rates. This retrofit provides the ability to preset and control traverse rates in both directions freeing the operator from constant adjustment and decision making during dressing.
The New Style Rate Valve Retrofit Kit comes complete with all hoses, fittings, and plates to assemble on your grinder. Your maintenance staff will be able to install the package in less than two hours.
Diamond Roll Dressing
Rotary dressing and truing is becoming more popular and profitable in abrasive machining. Manufacturers have found rotary dressing to be superior to single point, cluster and stick dressing for processes that require high part production or close part tolerances. Diamond roll or diamond disc dressing is a very fast method of dressing a centerless grinding wheel.
Fast infeed dressing can be achieved with a preformed diamond roll that plunges into the wheel forming the wheel to the diamond. Touch up dressing is a matter of seconds with this method. CRI often adds the diamond roll truing unit to our CNC dresser for grinding multiple parts at a time. This gives the consistency of the same preformed diamond roll truing each separated wheel, eliminating one more variable in multiple simultaneous part manufacturing. With processes requiring wide rolls, CRI recommends hydraulic driven motors to handle the large torque requirements.
The rotary dressing and truing process maximizes the grinding wheel life and greatly increases consistency in the wheel profile. Rotary dressing can be incorporated into the grinding machine’s controls to maximize production time, reduce operator labor, and ensure tighter tolerances of the finished product. Not only are higher production rates possible, but more complex designs can be produced, further reducing setup and improving the grinding machine’s utilization.
Eliminate the Cincinnati hydro-mechanical one-way compensation unit or handwheel with CRI’s Servo Comp. This thrufeed retrofit will give you the ability to make incremental moves in both forward and reverse directions. CRI’s Servo Comp is extremely accurate, making incremental compensation moves to .000050 of actual slide movement. When coupled with CRI’s Low Friction Slide system, incremental actual slide movements of .000010 are realized.
The Servo Comp comes ready to be interfaced to gaging in a closed loop system. CRI’s Micro Comp System can be retrofit on any model of Cincinnati centerless grinder. CRI directly couples a high resolution servo motor and gearbox to an oversize ballscrew to eliminate backlash issues. To further enhance the stiffness of the system, CRI has developed a one-piece, heavy-duty, cast-iron, yoke assembly.
Today’s tight tolerances demand ever increasing control over the grinding process. To obtain greater accuracy, servo systems with user friendly operator interfaces are employed. Give your operators the tools they need to obtain the quality your customers demand.
Servo Drive Transmission
Part quality improvements, as well as increased uptime, can be achieved with CRI’s Servo Drive Transmission replacement. This drive package eliminates the inherently problematic variable pitch pulley system found in Cincinnati’s centerless grinders. CRI’s Servo Drive allows for changing the speed of the regulating wheel during the grinding cycle, giving you greater control and flexibility of part quality.
The Servo Drive is fully programmable. During an infeed cycle, a very slow speed can be used at the start of the grind cycle for heavier stock removal. The drive can be sped up at the end of the grind cycle to improve roundness and surface finish of the ground part.
This simple compact drive has no gears to wear, giving you long lasting performance. CRI’s Servo Drive is a powerful drive with smooth, quiet operation that has all the benefits of servo drive systems, at a more affordable price.
Low Friction Slide Assembly
Low Friction Slides are especially useful to achieve critical part tolerances in thrufeed grinding. The bottom slide is milled to accept pretensioned linear rails that self-adjust for increased fit and durability. The rails have a capacity of over 30,000 pounds of load. This retrofit, coupled with our Micro Comp system, increases compensation capabilities to .000010 actual slide resolution.
With the new electroluminescent display, the SB-4475 model balancer puts more control and information at your fingertips. Quicker setups and dynamic graphic displays keep you well informed and in total control. The system is elegantly simple; a computer control, sensor, spindle mounting-adapter, and balance head.
The balancer takes the magic out of wheel balancing. Fully automatic operation means you no longer need to pre-balance grinding wheels, and eliminates the need for awkward equipment, which only does part of the job.
The SBS Dynamic Balance System operates on a principle of mass compensation for wheel imbalance. The balance head contains two movable eccentric weights. Each weight is driven by electric motors through a precision gear train. These weights can be repositioned to offset any imbalance in a grinding wheel.
The sensor picks up imbalance or vibration. The signal is fed to the controller, which filters the signal by RPM. The controller then drives the two balance head weights in the direction that reduces the amplitude of the vibration signal. When the weights are positioned so the lowest vibration level is reached, the balance cycle is complete.