Chapter 23 Flashcards
1
Q
State lathe cutting operation examples
A
Turning
Facing
Cutting off
Boring
Drilling
Knurling
Threading
2
Q
Tool geometry and its effect
A
- positive rake angle - reduce force/temperature
- relief angle - control rubbing/interference
- too high relief angle - tip chip off
- nose radius - sf and tip strength
- smaller nose - rough sf
-large nose - tool chatter
3
Q
List out component of lathe machine
A
- bed
- carriage
- headstock
- tailstock
- lead screw/feed rod
4
Q
List out workholding accessories
A
Chuck
Collet
Face plate
Mandrels
5
Q
Type of lathe
A
Special purpose
Tracer
Automatic
Turret
CNC
6
Q
What to consider before turning operation
A
- parts design to be fixtured/clamp easily
- dimension accuracy/sf
- no sharp corners/dimension variation
- blanks close to final dimension
- travel without obstruction
- machinable material
7
Q
How to prevent chatter and vibration of tool
A
- Minimize overhang
- Support workpiece rigidly
- Use tool with high stiffness and damping capacity
8
Q
Turning troubleshooting examples
A
- Tool break - tool angle/toughness/stiffness, parameter
- Tool wear - tool angle/material, fluids, parameter
- Rough sf - BUE, tool too sharp/chipped/worn, feed too high, vibration
- Dimension variability - tool/workholding stiffness, temp rise, tool wear
9
Q
Consideration before scree thread cutting
A
- Unthreaded length at bottom
- Avoid shallow bling tapped hole
- Chamfer at ends
- No slots/holes
- Standard thread insert
- Min engage length (1.5x diamter)
- All op in 1 setup
10
Q
Drill troubleshooting
A
- Drill break - chips clog, dull drill, feed too high, lip relief angle too small
- Drill wear - too high spd, fluid, high rake angle, burned drill
- Tapered hole - misalignment/bent, web not central
- Oversized hole - same , machine spindle loose, side force
- Poor hole sf - dull, fluid, alignment, welding
