Problem | Cause | Correction |
---|---|---|
Bell-mouthed hole | Tipped work head |
Realign work head |
Misalignment of center heights | Carefully "zero" centers | |
Over traveling of wheel | Reduce over travel from both ends | |
Burning of workpiece | Wheel too hard | Use softer grade wheel |
Work speed too slow | Increase work speed | |
Wheel infeed too fast | Reduce wheel infeed | |
Poor coolant flow | Ensure coolant directed at grinding contact | |
Chatter Marks | Out of balance | Balance carefully on own mount in and rebalance after truing operation |
Out of round | True before and after balancing | |
Acting too hard | Use faster dressing feed and traverse | |
Chatter Marks | Wheel too hard | Use softer wheel |
Spindle material not rigid enough | Replace spindle | |
Defective belt | Replace belt | |
Wheel out of balance or truth | Balance and/or true wheel... avoid use of bushed wheels | |
Dust or other particles inside wheel pully motor | Clean inside surface of pulleys | |
Worn spindle Machine not on solid foundation | Replace spindleAssure machine is properly aligned and not adjacent to heavy vibrating machines | |
Checking or Burning of the Work | Wheel too hard Poor dress |
Use a faster dress to open the wheel |
Diamond Lines in Work | Dressing too fast | Slow dress the wheel face |
Feed lines or spirals on workpiece | Poor wheel dressing | Redress wheel carefully |
Wheel too hard | Use softer wheel or reduce wheel feed | |
Wheel head tipped | Realign wheel head | |
Inaccuracies in Work | Improper dressing | Check alignment of dress |
Out-of-round hole | Overheated during previous rough grinding andbecome distorted | Before finish grinding, loosen clamp and retighten one at a time |
Rotating fixture out of balance | Balance rotating fixture | |
Hole distorted after front face grinding | Grind front face before grinding the hole | |
Rate of Cut too Slow | Dressing too slow | Increase the dressing rate to open the wheel face |
Scratching of the Work | Coarse grit or loading of foreign matter in wheel | Dress the wheel |
Scratching of work | Wheel too soft | Use harder grade wheel |
Faulty wheel dressing | Check for cracked or loose diamond and redress | |
Wheel too coarse | Use finer grit wheel | |
Dirty coolant | Change coolant | |
Tapered hole | Wheel too soft | Use harder grade wheel |
Uneven travel past each end of hole | Adjust over travel to be equal on both ends | |
Wheel Acting too Soft (not holding size) | Improper dress | Use lighter dressing feed Possibly slow down traverse rate |
Wheel glazing (shiny appearance) | Wheel too hard | Use softer grade wheels |
Wheel too fine | Use coarser grit wheel | |
Poor wheel dressing | Check diamond sharpness and redress | |
Poor quality/quantity coolant | Reduce oil level and increase amount of coolant | |
Wheel Loading | Infrequent dress | Dress wheel more often |
Wheel loading (metal lodged in wheel pores) | Wheel too fine | Use coarser grit wheel |
Wheel too hard | Use softer grade wheel | |
Wheel too finely dressed | Give a more open dressing to wheel | |
Poor coolant | Increase supply and clean coolant | |
Insufficient wheel breakdown | Increase work and traverse speeds |