Grinding Lathe Cutting Tools by dfhdhdhdhjr

VIEWS: 52 PAGES: 10

									Grinding Lathe
Cutting Tools

 Session 8



                 1
Grinding Lathe Tool
• Wide variety of cutting tools for lathe
   • All have certain angles and clearances
     regardless of shape
Shape and Dimensions of General-purpose
Lathe Toolbit




                                              2
Grinding a Lathe Toolbit
1. Dress face of grinding wheel




                                  3
Grinding a Lathe Toolbit
2. Grip toolbit firmly, supporting hands
   on grinder toolrest
3. Hold toolbit at proper angel to grind
   cutting edge angle
  •   Tilt bottom of
      toolbit toward
      wheel and grind
      10º side relief
      or clearance
      angle
                                           4
Grinding a Lathe Toolbit
Cutting edge ~ ½ In long and extend
over ¼ width of toolbit




10º side relief or clearance angle

                                      5
Grinding a Lathe Toolbit
4. While grinding, move toolbit back and
   forth across face of wheel
  •   Prevents grooving wheel
5. Toolbit must be cooled frequently
   during grinding
  •   Never overheat toolbit! Quench often!
  •   Never grind HSS with Silicon Carbide
      wheel

                                              6
Grinding a Lathe Toolbit
6. Grind end cutting edge so it forms
   angle of 70-80º with side cutting edge
  •   Hold tool so that end cutting edge angle
      and end relief angle of 15º ground at
      same time




                                                 7
Grinding a Lathe Toolbit
7. Using toolbit grinding gage, check
   amount of end relief when toolbit is in
   toolholder




                                             8
Grinding a Lathe Toolbit
8. Hold top of toolbit approximately 45º to
   axis of wheel and grind side rake to
   approximately 14º
   •   Do not grind below top of toolbit




Side rake ground the length
of the cutting edge
                                              9
Grinding a Lathe Toolbit
9. Grind slight radius on point of cutting
    tool, being sure to maintain same front
    and side clearance angle
10. With oilstone, hone cutting edge of
    toolbit slightly
  •   Lengthen life of toolbit
  •   Enable it to produce better surface finish
      on workpiece

                                                   10

								
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