Problem:
Calculate the cutting speed and feed for a milling operation given the following values:
Parameter | Value |
Tool Diameter | .500 in |
NumFlutes | 4 |
SFM | 600 ft/min |
IPR | .005 in |
Solution:
Step 1: Calculate RPM
Step 2: Calculate IPM
Note: Round off milling speeds and feeds to the nearest integer.
Problem:
Calculate the cutting speed and feed for a drill operation given the following values:
Parameter | Value |
Tool Diameter | .201 in |
SFM | 250 ft/min |
IPR | .002 in |
Solution:
Step 1: Calculate RPM
Step 2: Calculate IPM
Note: Round off drilling feeds to the first decimal point.
Problem:
Calculate the cutting speed and feed for a ¼-24 tap operation given the following values:
Parameter | Value |
Tool Diameter | .25 in |
SFM | 100 ft/min |
TPI | 24 |
Solution:
Step 1: Calculate RPM
Step 2: Calculate IPM
Note: Round off tapping feeds to three decimal points or the maximum number the machine allows.
In cases where the calculated spindle speed exceeds the machine capabilities, program the maximum spindle speed of the machine and use this value in the feed calculation.
Problem:
Calculate the cutting speed and feed for a milling operation given the following values:
Parameter | Value |
Tool Diameter | .125 in |
NumFlutes | 2 |
SFM | 300 ft/min |
IPR | .003 in/rev |
Maximum RPM | 7,500 rev/min |
Solution:
Step 1: Calculate RPM
Step 2: Calculate IPM