Machinery's Handbook, 31st Edition
SPEEDS AND FEEDS
1083
Table 1. Tool Troubleshooting Check List
Tool Material
Problem
Remedy
Excessive flank wear—tool life too short
Carbide
1. Change to harder, more wear-resistant grade 2. Reduce the cutting speed 3. Reduce the cutting speed and increase the feed to maintain production 4. Reduce the feed 5. For work-hardenable materials—increase the feed 1. Use a coolant 2. Reduce the cutting speed 3. Reduce the cutting speed and increase the feed to maintain production 4. Reduce the feed 5. For work-hardenable materials—increase the feed 6. Increase the lead angle 7. Increase the relief angles
HSS
6. Increase the lead angle 7. Increase the relief angle
Excessive cratering
Carbide
1. Use a crater-resistant grade 2. Use a harder, more wear-resistant grade 3. Reduce the cutting speed 4. Reduce the feed 5. Widen the chip breaker groove 1. Use a coolant 2. Reduce the cutting speed 3. Reduce the feed 4. Widen the chip breaker groove 1. Increase the cutting speed 2. Lightly hone the cutting edge
HSS
Cutting edge chipping
Carbide
3. Change to a tougher grade 4. Use negative-rake tools 5. Increase the lead angle 6. Reduce the feed
7. Reduce the depth of cut 8. Reduce the relief angles 9. If low cutting speed must be used, use a high-additive EP cutting fluid
1. Use a high additive EP cutting fluid 2. Lightly hone the cutting edge before using 3. Increase the lead angle 4. Reduce the feed
HSS
5. Reduce the depth of cut 6. Use a negative rake angle 7. Reduce the relief angles Carbide and HSS 1. Check the setup for cause if chatter occurs
2. Check the grinding procedure for tool overheating 3. Reduce the tool overhang 1. Change to a grade containing more tantalum 2. Reduce the cutting speed 3. Reduce the feed 1. Increase the cutting speed 2. If low cutting speed must be used, use a high additive EP cutting fluid 4. For light cuts, use straight titanium carbide grade 5. Increase the nose radius 6. Reduce the feed
Cutting edge deformation
Carbide
Poor surface finish
Carbide
7. Increase the relief angles 8. Use positive rake tools
Copyright 2020, Industrial Press, Inc.
ebooks.industrialpress.com
Made with FlippingBook - Share PDF online