Transcript Tech 46 Unit 4

Milling Defined
The process of cutting away material
by feeding a workpiece past a rotating
multiple tooth cutter
Vertical Milling Machine
Milling Machine Parts
Milling Machine Parts
Horizontal Milling Machine
Milling Operation
Conventional or Up Milling
Climb Milling
Milling Cutters
Milling Cutters
End Mills
Tool Holding for Milling
End Milling
Face Milling
Milling Workholding Devices
Milling Workholding Devices
Calculating RPM For Milling
• RPM = CS x 4/D
• Where RPM = Spindle speed (in
revolutions per minute).
• CS = cutting speed of milling cutter (in
SFPM)
• D = diameter of milling cutter (in inches)
Calculating Feed Rate For Milling
•
•
•
•
•
Feed Rate is expressed in IPM
IPM = CPT x N x RPM
IPM = Feed rate in inches per minute.
CPT = Chip per tooth
N = Number of teeth of the milling cutter
Calculate Feed Rate For Milling
Given The Following:
•
•
•
•
CS = 300
D = 0.5”
CPT = 0.005
N=2
Answer
• The first step is to calculate the spindle
speed before the feed rate can be
calculated.
• RPM = CS X 4/D = 300 x 4/0.5 = 2,400
• The second step is to calculate the feed
rate.
• IPM = CPT x N x RPM
• = 0.005 x 2 x 2,400
• = 24 IPM (Inches Per Minute)
ISO-8859
partner-pu
Offset Boring Head
ISO-8859
partner-pu
Right Angle Attachments
Digital Readout
Bed-Type Milling Machine
Horizontal Knee/Column Milling
Machine
Machining Center
Calculate IPM and RPM
• Given that:
– CS = 250
– D = 0.25”
– CPT = 0.003
–N=4
Show your work here:
RPM = _______;
IPM = ________
Your Name: ________________________