Calculate the horsepower required for a turning operation based on the feed rate, depth of cut, and cut

diameter, which will determine the material removal rate (or metal removal rate). Also required is the

unit power, which is a material property describing the amount of power required to cut that material.

The horsepower at both the spindle and the motor are shown, as well as the spindle torque for a given

spindle speed (RPM). The motor horsepower required for the turning operation can then be compared

to the horsepower capability of the machine.

Use The Horsepower Unit Factor Chart in the Unit Horsepower Field Based on Material being Machined.

Machining Resources, LLC, Machine Tools, Portland, TN

Calculate the surface roughness for a turning operation based on the tool nose radius and the cutting feed

(IPR). Single-point cutting tools used for finishing operations have a rounded front corner, or "nose", which

forms small peaks and valleys in the material as the tool feeds along the rotating work piece. The height of

these surface variations define the surface roughness, which can be measured as an arithmetic average (Ra)

or an RMS value.Type your paragraph here.

Determine the spindle speed (RPM) and feed rate (IPM) for a milling operation, as well as the cut time 

for a given cut length. Milling operations remove material by feeding a work piece into a rotating 

cutting tool with sharp teeth, such as an end mill or face mill. Calculations use the desired tool 

diameter, number of teeth, cutting speed, and cutting feed, which should be chosen based on the 

specific cutting conditions, including the work piece material and tool material. 

Calculate the horsepower required for a drilling operation based on the feed rate and tool diameter,

which are used to determine the material removal rate (or metal removal rate). Also required is the

unit power, which is a material property describing the amount of power required to cut that material.

The horsepower at both the spindle and the motor are shown, as well as the spindle torque for a given

spindle speed (RPM). The motor horsepower required for the drilling operation can then be compared

to the horsepower capability of the machine. 

In many milling applications, the cutting tool must step over and make several adjacent cuts to complete a machining feature. As a result a small cusp of material ,called a scallop ,will remain between these cuts on the machined surface if a ball end mill is used. The size of the step over distance and tool diameter will determine the scallop height between each step. Decreasing the step-over distance will minimize the scallop height, but will require more steps and therefore more time to machine the feature. 

To calculate the horsepower required for a milling operation based on the feed rate and depth of cut, which

are used to determine the material removal rate (or metal removal rate). Also required is the unit power,

which is a material property describing the amount of power required to cut that material. The horsepower

at both the spindle and the motor are shown, as well as the spindle torque for a given spindle speed (RPM).

The motor horsepower required for the milling operation can then be compared to the horsepower

capability of the machine.

Machining Resources, LLC 

PH 615-745-5047 

FAX 615-745-5063

E-Mail:tools@machiningresources.com

Determine the spindle speed (RPM) and feed rate (IPM) for a turning operation, as well as the cut time for a

given cut length. Turning operations remove material from a rotating work piece by feeding a single-point

cutting tool axially, along the side of the work piece. Calculations use the desired cut diameter, cutting

speed, and cutting feed, which should be chosen based on the specific cutting conditions, including the

work piece material and tool material. In some turning operations, the diameter of the work piece will change

so the spindle speed and cutting speed (SFM) must change as well. Typically, values are calculated for a

single cut diameter and then either the spindle speed or cutting speed is held constant while the other

varies.

Try Our Interactive Calculators for Milling, Drilling and Turning Call us if you need help!

Determine the spindle speed (RPM) and feed rate (IPM) for a drilling operation, as well as the cut time

for a given cut length. Drilling operations are those in which a cutting tool with sharp teeth, such as a

twist drill, rotates and feeds into the work piece axially, forming a hole with a diameter equal to that of

the tool. Calculations use the desired tool diameter, cutting speed, and cutting feed, which should be

chosen based on the specific cutting conditions, including the work piece material and tool

material.