Chapter 24 Flashcards
State type of milling
Peripheral milling
Face milling
End milling
Profile milling
Slot milling
Thread milling
Tapping
Groove milling
Explain the milling direction
Climb milling - same direction
Conventional milling - opposite direction
State the effect of insert shape on feed mark
Small corner radius - more feed mark
Corner flat -less feed mark
Wiper - smooth feed mark
Effet of lead angle
- lead angle decrease, chip thickness increase
State the undesirable position of face milling
The centre is on top of the edge (zero angle). It has to be positive or negative angle.
Troubleshooting guide for milling
Tool breakage - tool toughness, angle, parametre
Wear - parameter, tool material, angle, fluid
Rough SF - high feed, few teeth, tool chipped, BUE, chatter
Tolerance too broad - workholding, temp rise, dull ,chips clog
Burnished - dull, depth of cut too low, relief angle too small
Burr formation - dull, incorrect exit /entry angle, feed/depth too high, insert shape
Breakout - lead angle too low, incorrect geometry, entry/exit angle, feed/depth too high
What is back striking in milling and what is the cause?
The milling cutting edge strike the workpiece twice. Cause by dull, tilt in cutter spindle, negative tool angke
Describe column knee milling
“muay thai knee”
Describe Broaching
Imagine sawing/filling to create a profile either on surface/internal surface
State the 3 type of saw teeth
Straight - alternative
Raker - alternate straight
Wave - “wave”
Type of burr
High speed steel
Carbide
Rotary file
Ways to generate gears.
Form cutters
Pinion cutters
Rack cutters
Hobbing
