15. Nickel Based Materials
Guidelines for success
Chamfer parts before machining
This prevents burrs on exit and creates smooth
entrance and exit of cuts preventing chipping
Feed at 90º to chamfer to avoid notching
Use largest lead angle possible (45° preferred)
Use strongest geometry possible
Vary the D.O.C. (reduces notching)
Ramp the cuts on a slight angle (reduces notching)
Increase speed (reduce BUE)
16. Nickel Based Materials
Guidelines for success continued
Edge preps are very important (See charts)
When testing start at low feed and increase
.001" per pass.
Try slightly higher SFM than competition
Honed edge should provide longest life in
clean cuts
Increase SFM for interrupted cuts
Using coolant will increase notching but
reduce BUE
17. Guidelines for success
Round inserts
Do not exceed 25% of the insert diameter
DOC equal to 5% to 15% of diameter is optimum
Never double notch inserts by cutting in both
directions (DNGA or CNGA profile cuts)
Flank wear
Reduce speed
Increase feed
Nickel Based Materials
18. Countermeasures - Edge Chipping
Cause
Speed too low
Feed too high
Incorrect Edge
prep
Vibration
Countermeasure
See chart for correct speed
Reduce Feed
See Chart
Check Chucking, reduce tool
overhang. Change direction
of cut. Reduce lead angle or
nose radius to reduce tool
pressure
20. Troubleshooting Wear
Use correct SFM. Too high or too low can both
cause wear.
Check feed (IPR) Maybe too high.
Check for correct edge prep
Vibration and micro chipping. Your machine
and setup must be very rigid.
21. Troubleshooting Insert Breakage
Cause
Scale
Breakage on
entering or
exiting.
Countermeasure
Increase width of
land and add hone.
Increase insert
thickness, increase
edge prep, check shim
seat.
22. T Land
Measure the width of the T Land across insert
not perpendicular to T Land
W
23. Honed Insert
A hone .0005 to .001 used for finishing and
with a T Land for roughing
B hone = .002 to .003 used for severest
roughing.
Honed
Edge
24. Ceramic & Whisker Ceramic
Edge Preparations
T Lands
.008" x 20° (standard edge prep)
Turning & Milling Clean Materials Nickel Materials
.008" x 20° + A Hone
General Purpose Cobalt and Iron Based Alloys
.008" x 20° (use a lighter feed & higher speed)
.008" x 20° + A Hone
Scale Applications, Overlay Welds, Lightly Interrupted
Cuts, Hardened Material Finish Turn & Mill
.008" to .015" x 30° +B Hone
The Severest Roughing Applications
27. Gray Cast Irons
Speeds & Feeds
Cutting Speed
2000 to 3400
Start at 2300
Feed
.005” to .030”
As Required
28. Edge Preparations
T Lands
.008" – .016" x 20°
Turning & Milling .008" – .016 “ x 20° + A Hone
General Purpose Cobalt and Iron Based Alloys
.008" x 20° standard edge prep
.008" to .016” x 20° + A Hone
Scale Applications, Overlay Welds, Lightly
Interrupted Cuts, Hardened Material Finish Turn &
Mill
.013" to .015" x 30° +B Hone
The Severest Roughing Applications
Turning, max feed is 1.5 times the width of the T land
Milling the max feed must be less than the T land