Speeds and Feeds Calculator

The Speeds and Feeds Calculator may be employed for calculations of estimated speeds and feeds (RPM and IPM) values on the basis of the parameters you have currently set based on your tools and stock material.

How to use: Choose a type of operation (drilling, reaming, boring, counterboring, face milling, slab milling/side milling, end milling, or turning), select your stock material, choose a material for the tool (high-speed steel or carbide), input the quantity of teeth for the tool and the diameter of the workpiece/cutter. Hit the "Calculate" button for the results.

Speeds & Feeds Calculator


Interpreting Results:

-The maximum feed for roughing is the high rate
-The starting feed for the best finish is the low rate
-The starting feed for roughing should be taken from the middle of the feed range


The Speeds and Feeds Calculator uses the following formulas:

RPM = (12 * Surface Speed) / (PI * Tool Diameter) [revs/min]

Feed Rate = RPM * Chip Load * Number of Teeth (Flutes) [in/min]

Where PI is the constant (3.141592654).

Reference: Erik Oberg, et.al. (2008). Machinery's Handbook. 28th edition. Industrial Press.

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