| Problem |
Possible Cause |
Suggested Correction |
|
Chatter Marks
|
Grinding cut too heavy
|
Lighter cuts
|
| |
Wheel too hard |
Softer wheel, increase work speed, dress
coarser, reduce wheel speed, enrich
grinding fluid mixture |
| |
Wheel out of balance |
Balance the wheel |
| |
Slendor work unsupported
Machine Vibration
|
Check for vibration within the machine and
for vibration tramsitted to the machine |
| Short wave marks |
Vibration from belts
|
All these possible causes are corrected
by repair and/or replacemenmt of machine
components |
| |
Vibration transmitted from other
machine |
|
| |
Vibrations in hydraulic system |
|
| |
Vibration from motors
|
|
| Long wave marks |
Out of balance wheel
|
Rebalance wheel
|
| |
Stopping wheel without turning
coolant off, causing
unbalanced wheel
|
Rebalance wheel and make it a rule to stop
coolant and run wheel until moisture is
thrown off |
| |
Wheel oil soaked on onje side |
Replace wheel
|
| |
Allowing wheel to absorb moisture
from floor |
Store in racks off floor
|
Shadows
|
Grease or oil spots on wheel
|
Redress wheel face
|
| |
Hard spots in wheel surface
|
Heavily redress wheel or replace wheel |
| |
Wheel loading
See long wave marks |
Redress wheel. |
Burlap finish
|
Loose diamond tool |
Keep tool securely fastened
|
| |
Vibration of diamond tool |
Damped vibration support
|
| |
Uneven table traverse when truing |
Check hydraulic system |
Diamond Truing lines
|
Diamond too sharp
|
Try a duller diamond |
| |
Table traverse fast |
Slow table speed |
| |
Wheel too hard
|
Try softer wheel or make act softer
(See #1 above)
|
Feed Lines
|
Wheel not suitable
|
Change Wheel
|
| |
Improper control of traverse or
work speed when finishing
|
Change work speed or wheel speed when
finishing |
| |
Impropoer coolant distribution
when truing |
Readjust coolant flow and direction |
| |
Improper use of steadyrests
|
Ensure steadyrests are even |
| |
Head or footstock out of alignment |
Check head and footstock, tableways
and center holes. |
Barber Pole Finish
|
Improper lubrication of tableways
|
Adjust the oile flow or change oil
|
| |
Work loose on centers
|
Be sure the footstock and headstock are properly clamped
|
| |
Centers do not fit spindles
|
Check centers for fit
|
| |
Loose fitting footstock spindle
|
Obtain new footstock spindle
|
Burnt Work or Cracked Surfaces
|
Wheel too hard
|
Try softer wheel or make act softer
|
| |
Wheel structure too dense
|
Try more open structure wheel
|
| |
Wrong wheel bond
|
Consult Radiac Application Department
|
| |
Grinding wheel over speed
|
Reduce speed
|
| |
Work revolving too slowly
|
Increase work speed
|
| |
Grinding cut too heavy
|
Rough and finish grind with two wheels
|
| |
Insufficient coolant
|
Check coolant level, pipes and pumps
|
| |
Nozzle not directing coolant properly
|
Redirect flow or obtain new nozzle
|
| |
Wrong Coolant
|
Consult Radiac Applcation Department
|
| |
Grinding wheel improperly trued
|
Redress wheel
|
Rough Finish
|
Wheel too coarse or too hard
|
Softer wheel, increase work speed,
dress coarser, reduce wheel speed
|
| |
Diamond too sharp
|
Try dull diamond
|
| |
Dressingtoo coarse
|
Slow down dress traverse, lighter dress
|
| |
Cut too heavy
|
Try lighter side
|
| |
Traverse too fast
|
Slow down speed
|
| |
Work speed too fast
|
Decrease work speed
|
| |
Lack of proper steadyfast
|
Lighter stock removal, softer wheel
|
| |
Dirty coolant
|
Change coolant
|
| |
Solution of coolant too weak
|
Adjust concentration
|
Uneven Wheel Surface
|
Rapid diamond wear
|
Change to larger diamond
|
| |
Improper distribution of coolant
|
Readjust coolant flow and direction
|
| |
Diamond tool holder not securely clamped
|
Securely fasten holder
|
| |
Table floating
|
Reduce lubricant flow to table or change to lighter oil
|
Out-of-Round Work When Plunge Grinding
|
Work piece center holes out of round or not in line
|
Relap center holes
|
| |
Burrs in work piece center holes
|
Clean holes
|
| |
Work loose on centers
|
Be sure footstock and headstock are clamped
|
| |
Centers loose
|
Tighten and clean centers
|
| |
Center holes do not fit spindles
|
Replace and clean centers
|
| |
Center goles out-of-round
|
Regrind center holes
|
| |
Work piece center holes not deep enough
|
Deepen holes or blunt center points slightly
|
| |
Work centers scored
|
Regrind centers and lubricate
|
| |
Center points worn down
|
Regrind centers
|
| |
Work too tight on centers
|
Loosen footstock spring tension
|
| |
Insufficient coolant |
Readjust coolant flow
|