Lec 8 Flashcards
Slab milling (diagram)
arbor cutter
Face milling (diagram)
spindle
End milling (diagram)
spindle shank end mill
Vertical vs horizontal milling bit (diagram)
coloumn base spindle for milling cutting table saddle knee`
Material remove rate =
Remove material / cutting time
Upmilling (diagram)
Conventional
chips carried and thrown onto work piece surface - weld to already finished surface req polish and furtherwork increases cost
work hardens surface
slides across already machined surface
Upmilling chip size zero -> increase or Max -> decrease
Depth of cut starts at zero and increases
tooth slides along until pressure high enough to dig in and cut - slide cut therefore poor finish and work hardens material and dulls cutting tool
Upmilling pushing in which direction
pushes away and lifts workpiece from lathe -> req higher clamping force
Downmilling (diagram)
Chips decrease in thickness as tooth rotates
teeth engage at specific point - no slide cut
chips carried away from cutting surface
increased tool and machine load
cutter pulls towards workpiece and pushes down on it - lower clamping force
Downmilling disadv
Backlack is worse therefore lower tolerance
Planing (diagram)
Accurate flat surfaces various cross sections grooves and notches
Shaping (diagram)
Like planing smaller cutting tool moves across workpiece in one direction
Why is planing and shaping no longer used
superseded by milling and grinding in industry though they are cheaper in comparison only do one specific job
used to maintain large dies
Broaching (diagram)
single pass
many teeth each larger than the other
pull end - front pilot - rough teeth - semi finishing teeth - finishing teeth - rear pilot
Sawing (diagram)
Blade many small teeth each tooth removes small amount of material
req many passes
