> Drilling Speed and Feed Calculator

## Drilling Speed and Feed Calculator – CNC Drilling Feed Rate and Spindle Speed Calculation Formula

How to calculate drilling speed and feed correctly? There are many certain parameters to be considered. Simply input the required value in the Drilling Speed and Feed Calculator on CNCLATHING.COM, you can determine CNC drilling speeds and feeds in the shortest time. This RPM and IPM calculation formula for drilling can also used to figure out how long the cutting time would be in minutes for a given cut length. Our CNC machining formula collection also provides Milling Speed and Feed Calculator and Turning Speed and Feed Calculator accessible to anyone. Feeds and speeds are usually all set in the programming software, you always have chance to calculate and decide the rate before creating the program for drilling machines.

Note:

1. The RPM calculated in the Drilling Speed and Feed Calculator refers to the spindle speed in drilling process, and the IPM refers to feed rate.
2. The exact RPM is not always needed, the following calculator (formula) may be used to estimate the value closely.
3. Cutting speed (SFM): the rate at the workpiece surface, measured in surface feet per minute, irrespective of the machining operation used.
4. Tool diameter and Cut length in this calculator in inches.
5. The drilling RPM and IPM calculation formula use the desired tool diameter, cutting speed, and cutting feed, which should be chosen based on the specific cutting conditions, including the workpiece material and tool material.

## Drilling Speed and Feed Calculator

 Cutting speed (SFM) × 12 ÷ Tool diameter (in) × π = Spindle speed (RPM) Cutting feed (IPR) × Spindle speed (RPM) = Feed rate (IPM)
 Cut length (in) ÷ Feed rate (IPM) = Cut time (min)

## Understand Spindle Speed and Feed Rate – What is Drilling Spindle Speed (RPM)?

The spindle speed is the rotational frequency of the spindle of the machine, such as milling machine, lathes, drills, and routers, measured in revolutions per minute (RPM). The preferred speed is determined by working backward from the desired cutting speed (SFM or m/min), which may be defined as the rate at the workpiece surface, and incorporating the diameter of cutter or workpiece. CNC drilling is computerized process in which a cutting tool with sharp teeth rotates and feeds into the workpiece axially and create a hole with diameter equal to that of the tool (drill bit). In drilling operation, the tool diameter is used.

## Understand Spindle Speed and Feed Rate – What is Drilling Feed Rate (IPM)?

Feed rate is the velocity at which the cutter is fed, or the speed of the cutting tool’s movement relative to the workpiece as the tool makes a cut, typically measured in inches per minute (IPM). Drilling feed rate is determined by the type of cutting tools, surface finish desired for milling parts, power available at the spindle, rigidity of the machine and tool setup, characteristics of the material to be cut, workpiece strength, cut width, etc.

## The Importance of Drilling Speed and Feed Calculations

The spindle speed is derived from cutting feeds and speeds, it is one of the ideal cutting conditions for a tool, if the condition is not ideal, the adjustment of spindle speed is necessary, usually reduce in RPM or modify it to a correct value. Some materials can be cut at a wide range of spindle speeds, while cutting speed is critical to some materials like stainless steel, it’s easy to harden under cold working, then resist the tool’s cutting action. Insufficient feed rate or incorrect spindle speed will cause improper cutting conditions, therefore it’s important to figure out the CNC drilling speeds and feeds with our CNC drilling calculator and control it carefully to avoid overheating of the cutter and workpiece.

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