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Application Overview: Grinder

Grinders are used for cutting or shaping metal parts and providing the properly finished surface. Drives or Motion products are used to maintain constant grinder wheel speed during all phases of the process.


Application Challenges
  • Speed
    Maintain constant grinding surface speed
  • Efficiency
    Grind at optimal efficiency while doing heavy or light grinding
  • Electronic Gearing
    Follow an external encoder to synchronize conveyor with other sections of the process
  • Adjust torque to optimal performance as grinding stone dulls or clogs


Applicable Products
Drives Products | Servo and Motion Products

Drives ProductsFeaturesBenefits
A1000 or G7 Drives
Max FrequencyConstant grinding surface speed can be maintained

regardless of changes to the stone’s diameter during the grinding process.

The user can set variable speed levels up to 400 hz.

Adjustable Speed ControlArbitrary grinding speeds can be set based on the amount of material to be cut and the grinding wheel type.
Frequency Detection and Speed AgreeBoth Frequency Detection and Speed Agree signals can interlock with primary and auxiliary machinery as well as safety equipment while the grindstone is rotating.
Energy Saving ControlEnergy Saving Control reduces motor noise and stabilizes the load, perfecting the finishing process. Energy Saving Control allows the motor to run at optimal efficiency and precision when performing light grinding.
Overtorque or Undertorque DetectionBoth Overtorque and Undertorque detection settings enable the drive to quickly detect changes as the grinding stone dulls or clogs. The drive can be set to respond to selectable load changes by using Variable Overtorque Detection via the drives Analog input.

Servo and Motion ProductsFeaturesBenefits
Machine control capabilities in single-axis controllerReduce third-party devices by combining machine control with motion control
EtherNet/IP communication OptionSigma-5 with MP2600iec can act a master or slave device
MotionWorks IEC Programming SoftwareIEC61131-3 based programming makes new production runs only a few mouse clicks away
Variable ratio digital gearingIndependently driven axes can be perfectly synchronized
High resolution serial encoder Up to 20-bit resolution translates into excellent speed and torque ripple characteristics. High noise immunity if afforded by serial encoder technology utilizing error-checking algorithms.
High torque to inertia ratioDynamic performance in a small space-saving design
High IP ratings availableIP67 on some models permits both solid debris and liquid containments easing machine design requirements
Bearings with high radial loading capacitySGMGV motor features high radial load capacity compared to motors of similar power capacity, increasing the functional life of the motor in a grinding application
Auto ID EncoderMachine commissioning requires no loading of motor data into the amplifier – plug and play operation


Application Details

Heavy cutting is done at slow speed. With a constant wheel pressure on the material to be shaped, the pounds/minute of material removed, or work done, varies with the wheel speed. This is the constant torque part of the profile. After the heavy cutting is complete, a polishing (light cutting) operation is performed. A high speed, lighter wheel-to-material pressure is maintained; therefore, less material in pounds/minute is removed. This is the constant horsepower part of the load profile.

Yaskawa AC drives have features that save energy, which allows the motor to run at optimal efficiency and precision when performing light grinding. Energy Saving Mode also reduces motor noise and stabilizes the load, perfecting the finishing process. Yaskawa AC drives can automatically detect changes to the amount of torque required during the shaping and finishing phases using Torque Detection. This feedback enables the drive to quickly detect changes as the grinding stone dulls or clogs. This can lead to significant cost savings by prolonging the life of grinding stones.

Motion Control products in precision grinding, such as convex and concave shapes typical in lens grinding require servo control to maintain accuracy on the cutting axis (at minimum).


Additional Information

The pdf contains the same information as the web, but in some cases may contain more and should be used if a printed version is required.


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