Speed/Feed Examples

Milling Speed/Feed Example

Problem:

Calculate the cutting speed and feed for a milling operation given the following values:

ParameterValue
Tool Diameter.500 in
NumFlutes4
SFM600 ft/min
IPR.005 in

Table 3.1: Mill Speed/Feed Example

Solution:

Step 1: Calculate RPM

Step 2: Calculate IPM

Note: Round off milling speeds and feeds to the nearest integer.

Drill Speed/Feed Example

Problem:

Calculate the cutting speed and feed for a drill operation given the following values:

ParameterValue
Tool Diameter.201 in
SFM250 ft/min
IPR.002 in

Table 3.2: Drill Speed/Feed Example

Solution:

Step 1: Calculate RPM

Step 2: Calculate IPM

Note: Round off drilling feeds to the first decimal point.

Tap Speed/Feed Example

Problem:

Calculate the cutting speed and feed for a ¼-24 tap operation given the following values:

ParameterValue
Tool Diameter.25 in
SFM100 ft/min
TPI24

Table 3.3: Tap Speed/Feed Example

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.

Maximum Spindle Speed Example

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:

ParameterValue
Tool Diameter.125 in
NumFlutes2
SFM300 ft/min
IPR.003 in/rev
Maximum RPM7,500 rev/min

Table 3.4: Maximum Spindle Speed Example

Solution:

Step 1: Calculate RPM

Step 2: Calculate IPM