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Which is the possible cause when a twist drill produces a rough hole on the job? 

Which is the possible cause when a twist drill produces a rough hole on the job?  Correct Answer Feed rate is too high 

Explanation:

The common defects in drilling are listed below:

Oversized holes
  • The unequal length of the cutting edges
  • The unequal angle of the cutting edges
  • The unequal thinning of the point
  • The spindle running out of the center
  • The drill point not being in the center
Overheated drills
  • Cutting speed is too high
  • Feed rate is too high
  • Clearance angle is incorrect
  • Cooling is ineffective
  • Point angle is incorrect
  • The drill is not sharp
Rough holes
  • Feed rate is too much
  • Drill cutting edges are not sharp
  • Cooling is ineffective
An unequal flow of chips
  • An unequal flow of chips is caused if the cutting edges are not equal and the point angle is not in the center of the
    drill
Broken drill or split web
  • Cutting speed is too high
  • Feed rate is too high
  • Work is not held rigidly
  • The drill is not held correctly
  • The drill is not sharp
  • Point angle is incorrect
  • Cooling is insufficient
  • Flutes are clogged with chips

Related Questions

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4. The objective of job evaluation is to price the job rather than the man.
5. The objective of cost management is a product design.
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