TECHNICAL INFO

Troubleshooting

■ The grinding sound suddenly becomes high
■ Feed marks are left on the workpiece
■ Grinding ability decreased
■ Grinding burns appear
■ Poor surface roughness
■ Roundness is poor
■ Scratches appear irregularly
■ Isolated scratches appear
■ Uniformly distributed chattering occurs
■ The grinding sound alternates between loud and quiet

■ The grinding sound suddenly becomes low
■ Grinding affected layer
■ The grinding ratio is being decreased
■ Warping occurs (for surface grinders)
■ Poor workpiece tolerance
■ Cylindricity is poor
■ Screw-like scratches appear
■ Chattering occurs at regular intervals
■ Chattering occurs irregularly

When a problem occurs while grinding, finding the cause is not easy due to the variety of complexly intertwined factors involved. In order to investigate the cause of problems, it’s important to understand what is going on during grinding — things like the condition of the workpiece, the condition of the wheel usage surface, and sound and heat generated by the process — by being sufficiently observant on the work site. Please make use of these simple troubleshooting measures that we’ve summarized here.

The grinding sound suddenly becomes high
• Decrease the wheel speed (reduce V/v) • Increase the infeed rate and traverse feed rate • Increase coolant volume or pressure	• Decrease the stock removal • Increase dressing amount and traverse feed rate • Raise coolant concentration
The grinding sound suddenly becomes low
• Increase the wheel speed (increase V/v) • Decrease the infeed rate and traverse feed rate • Decrease dressing amount and traverse feed rate	• Decrease the stock removal • Increase dresser's setting angle • Increase coolant volume or pressure
Feed marks are left on the workpiece
• Decrease the wheel speed (reduce V/v) • Decrease dressing amount and traverse rate • Adjust workhead parallel and machine spindle	• Decrease the stock removal • Increase coolant volume or pressure
Grinding affected layer
• Decrease the wheel speed (reduce V/v) • Decrease the infeed rate and traverse feed rate • Increase coolant volume or pressure	• Decrease the stock removal • Increase dressing amount and traverse feed rate
Grinding ability decreased
• Decrease the wheel speed (reduce V/v) • Increase dressing amount and traverse feed rate	• Decrease the stock removal • Increase coolant volume or pressure
The grinding ratio is being decreased
• Increase the wheel speed (increase V/v) • Decrease the infeed rate and traverse feed rate • Decrease dressing amount and traverse feed rate	• Decrease the stock removal • Increase dresser's setting angle • Increase coolant volume or pressure
Grinding burns appear
• Decrease the wheel speed (reduce V/v) • Decrease dressing amount and traverse feed rate • Use coolat with good lubricity-penetration	• Decrease the stock removal • Increase coolant volume or pressure
Warping occurs (for surface grinders)
• Decrease the stock removal • Use coolant with good lubricity-penetration	• Increase coolant volume or pressure
Poor surface roughness
• Increase the wheel speed (increase V/v) • Decrease the infeed rate and traverse feed rate • Increase dresser's setting angle • Raise the concentration of coolant	• Decrease the stock removal • Do frequent dressing • Decrease dressing amount and traverse feed rate • Rebalance the wheel carefuly
Poor workpiece tolerance
• Decrease the wheel speed (increase V/v) • Decrease the infeed rate and traverse feed rate	• Decrease the stock removal
Roundness is poor
• Change the grinding cycle • Replace the dresser with a new one	• Correct the center hole by grinding it
Cylindricity is poor
• Modify the stabilizer position • Adjust the table swivel	• Adjust over-run amount in the processing surface end • Modify to a dressaer with large diamond
Scratches appear irregularly
• Increase the dresser's setting angle • Clean around the coolant	• Decrease the infeed rate and traverse feed rate
Screw-like scratches appear
• Fix the dresser securely	• Chamfer the grinding wheel immediately after dressing
Isolated scratches appear
• Increase the wheel speed (increase V/v) • Decrease dressing amount and traverse feed rate • Change toa dresser with sharp point	• Decrease the stock removal • Increase coolant volume or pressure
Chattering occurs at regular intervals
• Decrease the stock removal • Fix the dresser securely • Raise the concentration of coolant • Rebalance the wheel carefuly	• Do dressing frequently • Chamfer the grinding wheel immediately after dressing • Increase coolant volume or pressure • Fix the grinding wheel to the flange securely
Uniformly distributed chattering occurs
• Decrease the vibrations of outside, machine, etc. • Decrease the wheel speed (reduce V/v) • Decrease the infeed rate and traverse feed rate • Increase coolant volume or pressure	• Rebalance the wheel carefuly • Decrease the stock removal • Decrease dressing amount and traverse feed rate
Chattering occurs irregularly
• Decrease the infeed rate and traverse feed rate	• Clean around the coolant
The grinding sound fluctuates repeatedly
• Decrease the infeed rate and traverse feed rate

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