|
|
| Operation |
Parameter |
Value |
Feed SFPM |
Rate IPR |
| Turning |
-- |
-- |
47-70 |
0.001 |
| Cut-off |
Tool Width |
0.0625-0.5 inch |
47-70 |
0.001 |
| Forming |
Tool Width |
1.0-1.5 inch |
47-70 |
0.001 |
| Drilling |
Diameter |
0.25 inch |
42-51 |
0.006 |
|
0.75 inch |
42-51 |
0.014 |
| Reaming |
Diameter |
Under 0.5 inch |
60 |
0.003 |
|
Over 0.5 inch |
60 |
0.008 |
| Die Threading |
Threads (Teeth)
per inch |
3-7.5 |
4-8 |
-- |
|
8-15 |
6-10 |
|
over 16 |
8-12 |
| Tapping |
-- |
-- |
20 |
-- |
Milling End
Peripheral |
Depth of Cut |
0.050 inch |
70 |
0.001-0.004 |
| Broaching |
Chip Load |
0.003 inch/tooth |
15 |
-- |
| Operation |
Thickness |
Pitch, T.P.I. |
Speed |
Speed Rate |
| Turning |
under 0.75 inch |
10 |
70 |
0.005 |
| 0.75-2 |
6 |
70 |
0.005 |
| over 2 |
4 |
70 |
0.005 |
Satisfactory machinability may be achieved by selecting the correct tools and machine set-ups. The relatively high hardness and the tendacy of the AL-6XN alloy to work harden must be taken into account when planning machine operations. The above table may be used as a guideline. In addition the following suggestions may be useful:
- Chips of austenitic stainless steels tend to be stringy and ductile so that the use of curlers or breakers is suggested for turning operations.
- Machine tools should not be used at more than 75% of rated capacity.
- Both tool and workpiece should be rigid with minimum overhang.
- Tools should be reground at regular intervals to keep them sharp.
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