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External Grinding FAQs

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Problems in External Grindings:
INDICATION
CAUSE
REMEDY
CHATTER MARKS :short, close & evenly spaces marks. Loose wheel spindle bearing. Tighten or refit bearing. Check axial and radial play.
Regularly spaced marks. General vibration. check for loose coupings and be sure that motor and spindle are in balance.
Long regularly speed chatter marks forming checker board pattern. Wheel out of balance. Re-balance carefully repeat after dressing. If trouble persists run wheel without coolant to throw off excess of water.
  Wheel out of round. True before and after balancing: True to face.
Chatter marks fairly long wide and evenly spaced at wide intervals and generally discolored : wheel glazed or loaded. Work centres or work rest 12. Check fit of centre.
General Dressing use sharp diamond rigidly held close to wheel.
Scratching of work narrow and deep regular marks. Wheel too coarse. Use finer grit.
Wide regular marks of varying depth. Wheel too soft. Use harder grade.
Widely spaced spots on work. Oil stoped or glazed area on wheel face. Balance and true wheel. Avoid getting oil on wheel face
Fine spiral or thread on work. Faulty wheel dresser. Replace cracked or broken diamond : set dresser at correct angle : turn diamond every third dressing : tighten holder of diamond dress with less penetration : do not allow diamond to dwell in contact with wheel : do not start dressing cuts on face , locate tool on face but start cuts from edge : Traverse diamond across face of wheel evenly : round off wheel edges.
  Faulty operation Prevent penetration of advancing of following edges of wheel by being careful to dress wheel race parallel to work : reduce wheel pressure : provide additional steady rest : reduce traverse in relation to work rotation : when making numerous passes make slight change in traverse rate each pass to break up pattern.

Wavy traverse lines.

 

Ragged wheel edges. Round off wheel edge
Isolating deep marks. Coarse grit or foreign matter in wheel face Dress out
Spirals on work : Spirals (Traverse lines ) same lead on work as rate of traverse. Turning Having turn tool set exactly on work wheel contact line, but pointed down 10 degree round on edge of wheel face.
Wheel grinding effect, lack of cut, glazing buring of work, chatter. Wheel too hard in effect. Increase work and traverse speed , decrease wheel spindle speed and width of wheel face. open up wheel by sharper dressing : increase wheel pressure (infeed) : Use thinner coolant : avoid dwelling at end of traverse : avoid gummy coolants use coarser grit & use coarser softer bond.
Wheel marks : short wheel life : not holding cuts : tapered work. Wheel too soft in effect. Decrease work and traverse speed & wheel pressure (infeed) . Increase spindle sped. wheel diameter and width of wheel face.Dress with slow traverse & slight penetration.Use heavier coolants. Do not pass off work at end of traverse.
Wheel loading : metal lodged on grains or in wheel porous. Incorrect wheel Use coarse grit or more open bond to provide chip clearence : use abrasive that fracture more easily : use more coolant.
  Faulty dressing. Use sharper dresser : Dress faster : Clean wheel after dressing.
  Faulty coolant use more cleaner and thinner coolant.
  Faulty operations. Manipulate to soften effect wheel : use less infeed.
Wheel glazing : shiny appearance. Improper wheel Use coarse grit, softer bond : manipulate wheel to soften effect.
  Improper dressing. Keep wheel sharp with sharp dresser. Faster traverse .
  Faulty coolant use less oil coolant. use more coolant.
  Faulty operation use greater infeed
  Gummy coolant Increase soda content if water is hard : do not use soluble oils in harder water.