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
