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Usinage - Taraudage - Troubleshooting Guide - Dimmensional Accuracy  
      Dimmensional Accuracy
      » Surface Finish
  • Torn or rough thread
  • Chattering on tapped thread
      » Tool Life
  • Breakage
  • Chipping
  • Wear
 
PROBLEM SOLUTION
Oversize Pitch Diameter 
Incorrect tap 1. Use proper GH limits of taps.
  2. Use longer chamfered taps
  
Chip packing 1. Use spiral point or spiral fluted taps.
  2. Reduce number of flutes to provide extra chip room.
  3. Use larger hole size.
  4. If tapping a blind hole, allow deeper holes where applicable or shorten the thread length of the parts.
  5. Use proper lubricant.
  
Galling 1. Apply proper surface treatment such as steam oxide or TiN.
  2. Use proper cutting lubricant.
  3. Reduce tapping speed.
  4. Use proper cutting angle in accordance with material being tapped.
  5. Use larger hole size.
 
Operating conditions 1. Apply proper tapping speed.
  2. Correct alignment of tap and drilled hole.
  3. Use proper tapping speed to avoid torn or rough threads.
  4. Use lead screw tapper.
  5. Use proper tapping machine with suitable power.
  6. Avoid misalignment of the tap and drilled hole from loose spindle or worn holder.
  
Tool conditions 1. Obtain proper indexing angle for the flutes at the cutting edge.
  2. Grind proper cutting angle and chamfer angle.
  3. Avoid too narrow a land width.
  4. Remove burrs from regrinding.
  
PROBLEM  SOLUTION 
Oversize Internal Diameter 
Hole size 1. Use minimum hole size.
  2. Avoid tapered hole.
  3. Use proper chamfered taps.
 
Galling 1. Apply proper surface treatment such as steam oxide or TiN.
  2. Use proper cutting lubricant.
  3. Reduce tapping speed.
  4. Use proper cutting angle in accordance with material being tapped.
 
PROBLEM  SOLUTION 
Undersize Pitch Diameter 
Incorrect tap 1. Use oversize taps for cutting materials such as copper alloy, aluminum alloy, and cast iron.
  2. Use oversize taps for cutting tubing which will have "spring back" action after tapping.
  3. Apply proper chamfer angle.
  4. Increase cutting angle.
 
Damaged thread Use proper reversing speed to avoid damaging tapped thread on the way out of the hole.
 
Left-over chips 1. Increase cutting performance to avoid any left over chips in the hole.
  2. Remove left over chips from the hole for gage checking.
 
PROBLEM  SOLUTION 
Undersize Internal Diameter 
Hole diameter Use maximum drill size.
 
 
 
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