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Troubleshooting Tips: Centerless Grinding

Problem Cause Correction
Barrel-shaped work (low ends) Work guides on entrance and exit sides deflect towards feed wheel Readjust entrance and exit guides
Face of feed wheel not straight at contact point with work piece Properly dress feed wheel; be sure truing fixture is properly set
Burned work Improper coolant flow Readjust nozzle
Dull diamond glazing Replace diamond or rotate wheel
Wheel too hard Replace wheel or make wheel act softer
Dress rate too slow Increase diamond traverse rate
Chatter Wheel out of balance Heavy dress or replace wheel
Wheel not tight on spindle Tighten flanges spindle
Blade angle too steep Change work blade
Work too high above Readjust work blade center
Work blade too thin or warped Replace blade
Wheel too hard or too fine Replace wheel or make wheel act softer
Glazed or loaded wheel Redress
Blade not properly clamped Readjust blade
Too heavy a cut Decrease stock removal rate
Vibration transmitted to machine Check for vibration
Concave work (low center)` Work guides on entrance and exit sides deflected toward the grinding wheel. Also see second cause above Readjust entrance and exit guides
Erratic work sizes Gins not adjusted properly on upper and lower slides Readjust gibs
Wear in in-feed screw and nut Repair infeed mechanism
In-feed lever not held tight Tighten nut
Insufficient lubrication on slides Provide proper lubrication
Work blade loose Tighten blade
Parts too hot (due to wheel and/or coolant) Change wheel, adjust coolant flow, or make wheel cut more freely
Feed wheel camming Tighten collet screws, replace feed wheel bearings
Feed Lines Grinding wheel not relived on exit side Dress wheel so it stops grinding 1/2" from exit table
Work guides improperly set Readjust guides
Wheel not uniform across face Redress
Fish Tails Dirty coolant Replace coolant or filters
Loose grit in wheel Redress wheel
Out-of-round Work not high enough above center Readjust work blade
Work piece bowed Pre-straighten work piece
Feed wheel not round Properly redress feed wheel
Blade angle not steep enough Change work piece
Feed wheel too slow Increase feed wheel speed
Poor Finish Improper wheel grade Proper adjustments are self_evident
Dirty coolant Proper adjustments are self_evident
Dress rate too fast Proper adjustments are self_evident
Jumpy, erratic dressing traverse rate Proper adjustments are self_evident
Dull diamond Proper adjustments are self_evident
Diamond loose Proper adjustments are self_evident
Blade not tight Proper adjustments are self_evident
Blade angle too steep Proper adjustments are self_evident
Pick-up on blade Proper adjustments are self_evident
Oil or loading on wheel face Proper adjustments are self_evident
Feed wheel loose Proper adjustments are self_evident
Feed wheel speed too high Proper adjustments are self_evident
Work too high above center Proper adjustments are self_evident
Scored Work Pick-up blade (dirt, chips, abrasive) Use coolant with greater lubricity or change work
Straight taper on work Work guides improperly set Readjust guides
Blade not level Readjust blade
Loose gibs Adjust and tighten gibs
Parts not end to end in through feed Adjust feed rate
Parts too hot (due to in through feed wheel and/or coolant) Change wheel, adjust coolant flow or make wheel cut more freely
Taper on rear Work guides on exit end of work deflected toward the feed wheel. Also see second cause in #8 Readjust exit guides
Work not straight Work not straightened sufficiently before grinding Pre-straighten work piece
Too much stock removal on a previous or prior passes Adjust stock removal rates
Parts too hot (due to wheel and/or coolant) Change wheel, adjust coolant flow or make wheel cut more freely