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TABLE 2-6.  TOOL CORRECTION CHART.

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T. O. 1-1A-9 TABLE 2-6.  TOOL CORRECTION CHART. A. TOOL CHATTER Check: 1.  Tool overhand (reduce to minimum) 2.  Work Support (eliminate vibration) 3.  Nose radius (too large a radius may cause chatter) 4.  Tool clearance (be sure end cutting edge angle is sufficient) 5.  Feed (increase feed if too light a feed has tendency to rub rather than cut) 6.  Tool load (vary side cutting edge angle to correct improper load) 7.  Chip breaker (widen breaker if chips are too tight.) B. CHIPPING OF CUTTING EDGE Check: 1.  Edge sharpness (Hone or chamber slightly) 2.  Chip Breaker (widen breaker if tight chip causes chipping) 3.  Speed  (Increase) 4.  Coolant  (Heating and cooling of tip may cause chipping) C. RAPID TOOL WEAR Check: 1.  Feed (Increase) 2.  Speed  (Low and excessive speeds cause tool wear) 3.  Relief angles (clearance may not be sufficient) 4.  Nose radius (decrease size) D. UNSATISFACTORY FINISH Check: 1.  Speed (rough finishes can be eliminated by increasing speed) 2.  Nose radius (too large a nose radius mats finish) 2-81.  MACHINING CORROSION RESISTING STEEL 2-82.  The corrosion resisting steels, especially the 18-8 grades, are more difficult to machine than the carbon steels and most   other   metals.      Even   though   they   are   more   difficult   to   machine,   the   same   general   methods   are   used   with modification/compensation for the individual characteristics of each type or grade.  To improve machining characteristics of some types, their chemical content is modified by adding selenium (Se) and sulfur (S).  The modified alloys which are usually designated by a suffix to type number such as 430 F or Se.  Exceptions are types 416 and 303. 2-83.   For  comparison  and  as  a  general  guide  to  the  machining  characteristics  of  free  machining  screw  stock  grade B1112 as an 100% machinable '"norm.  " This table is only intended as a starting point and is not intended to replace any information accumulated through experience or other available data. 2-70

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