GENERATING GEAR GRINDING
Infeed in mm
per stroke (pass)
Feed rate
in mm/Rev.
Shift Movement
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Grinding Perfect Gears: A Tough Puzzle?
Dressing
Grinding Wheels
Machine
Quality
etc.
Coolant
Perfect
Gears
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Causes of Gear Errors: Profile Deviations
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Causes of Gear Errors: Lead Error
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Causes of Gear Errors: Burning & Cracking
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Causes of Gear Errors: Concentricity
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- good profile form
1
Profile Form
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one or two sided
2
Profile Form
- diamond worn on one side
- insufficent grinding allowance
- insufficient amount of shifting
- grit size of wheel too fine
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3
Profile Form
- unbalanced grinding wheel
- spindel, workpiece out-of round
- wrong change gears
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4
Profile Form
- wrong profile angle on grinding wheel
- wrong value for differential change gears (AZA, NZA)win-win
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5
Profile Form
- wobble, faulty fixturing tooling
- tailstock centres damaged/faulty
- workpiece spindle bearings damaged
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6
Profile Form
- unfavorable gear flank/ grinding wheel contact sequence
- profile loss on wheel, shifting too small
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- grinding wheel too soft
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7
Profile Form
- insufficient profiling of grinding wheel
- tooth profile of grinding wheel too thick
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one or two sided
- root relief of grinding wheel excessive
8
Profile Form
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- correct alignment
9
Alignment
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- insufficient overtravel
10
Alignment
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11
Alignment
- grinding wheel imbalance
- feed per rev. excessive
- grinding spindle ouf-of round
- flange damaged
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12
Alignment
- insufficient load angle compensation
- error in spindle drive system
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13
Alignment
- wobble, centres, fixturing faulty
- tailstock centre inprecise
- workpiece spindle out-of-round
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14
Alignment
- work head inclination angle wrongly set
- backlash in change gears incorrect
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15
Alignment
- wrong value for differential gears
- differential gear train out-of-round
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16
Alignment
- crowning erratic on left flank due to excessive
clearance between stylus and stylus bushing
(non-CNC machines only)
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- multi-start grindng when number of teeth divided by
number of starts equals even, whole number.
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