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counterbore

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counterbore


  3  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Counterbore  \Coun"ter*bore`\  (-b?r`),  n. 
  1.  A  flat-bottomed  cylindrical  enlargement  of  the  mouth  of  a 
  hole,  usually  of  slight  depth,  as  for  receiving  a 
  cylindrical  screw  head. 
 
  2.  A  kind  of  pin  drill  with  the  cutting  edge  or  edges  normal 
  to  the  axis;  --  used  for  enlarging  a  hole,  or  for  forming 
  a  flat-bottomed  recess  at  its  mouth. 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Counterbore  \Coun`ter*bore"\  (koun`t?r-b?r"),  v.  t. 
  To  form  a  counterbore  in  by  boring,  turning,  or  drilling;  to 
  enlarge,  as  a  hole,  by  means  of  a  counterbore. 
 
  From  WordNet  r  1.6  [wn]: 
 
  counterbore 
  n  :  a  bit  for  enlarging  the  upper  part  of  a  hole  [syn:  {countersink}, 
  {countersink  bit}] 




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