How to Correct Chatter Marks
Chatter
Marks on the Ground Surface of a Part occur when the Grinding Wheel bounces
in and out against the Part Surface during Grinding instead of
feeding into the Part Surface with a smooth steady stroke. When Chatter Marks
are observed on a Part it must be scrapped.
1. |
Grinding Wheel Gap In-feed Speed is too fast. |
2. |
Work Head Spindle Speed is too fast or too slow. |
3. |
The Grinding Wheel is dull. |
4. |
The Diamond Dresser is blunt or damaged and is therefore not dressing the Grinding Wheel correctly. |
5. |
The part count between dressings is too low. |
6. |
The Grinding Wheel is not balanced. |
7. |
The Grinding Wheel Belt and/or Grinding Wheel Belt Pulleys are dirty or loose. |
8. |
There is excessive vibration caused by a faulty Motor or Motor Bearings. |
9. |
Vibrations are being transmitted into the Grinder by other machines or presses in the vicinity of the Grinder. |
1. |
Make sure the Grinding Wheel Gap In-feed Speed (variable 526) is set according to the Grinder 500 Variables Table. If the Grinding Wheel Gap In-feed Speed is not set correctly, adjust the Grinding Wheel Gap In-feed Speed. |
2. |
Make sure the Work Head Spindle Speed (variables 524 and 525) are set according to the Grinder 500 Variables Table. If the Work Head Spindle Speed is not set correctly, adjust the Work Head Spindle Speed. |
3. |
Dress the Grinding Wheel. Click here for procedure |
4. |
Replace the Diamond Dresser. Click here for procedure |
5. |
Make sure the part count between dressings is set between 8 and 12. Click here for procedure |
6. |
Balance the Grinding Wheel. |
7. |
Examine and adjust the Grinding Wheel Belt and Pulleys. |
8. |
Examine and replace faulty Motors and/or Motor Bearings if required. |
9. |
Relocate the Grinder or the source of external vibration or install a Vibration Dampening System under the Grinder. |