Length of Approach for Drilling Operation Calculator

✖Diameter of drill bit is essentially the straight distance across the widest part of the cutting edge (lips) of the drill bit. It determines the width of the hole it will create on workpiece.ⓘ Diameter of Drill Bit [D]			+10% -10%
✖Drill Point Angle is the angle between the two cutting edges (lips) of a drill bit at its tip. This angle affects how aggressively the bit cuts and what materials it's suited for.ⓘ Drill Point Angle [θ]			+10% -10%

✖Approach Distance is the extra distance the drill travels before it starts cutting into the workpiece. It allows the tool to reach its cutting speed and position itself properly for an accurate hole.ⓘ Length of Approach for Drilling Operation [A]

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Formula

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Length of Approach for Drilling Operation

Formula

`"A" = 0.5*"D"*cot("θ"/2)`

Example

`"12.49999mm"=0.5*"60.3553mm"*cot("135°"/2)`

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Length of Approach for Drilling Operation Solution

STEP 0: Pre-Calculation Summary

Formula Used

Approach Distance = 0.5*Diameter of Drill Bit*cot(Drill Point Angle/2)
A = 0.5*D*cot(θ/2)
This formula uses 1 Functions, 3 Variables

Functions Used

cot - Cotangent is a trigonometric function that is defined as the ratio of the adjacent side to the opposite side in a right triangle., cot(Angle)

Variables Used

Approach Distance - (Measured in Meter) - Approach Distance is the extra distance the drill travels before it starts cutting into the workpiece. It allows the tool to reach its cutting speed and position itself properly for an accurate hole.
Diameter of Drill Bit - (Measured in Meter) - Diameter of drill bit is essentially the straight distance across the widest part of the cutting edge (lips) of the drill bit. It determines the width of the hole it will create on workpiece.
Drill Point Angle - (Measured in Radian) - Drill Point Angle is the angle between the two cutting edges (lips) of a drill bit at its tip. This angle affects how aggressively the bit cuts and what materials it's suited for.

STEP 1: Convert Input(s) to Base Unit

Diameter of Drill Bit: 60.3553 Millimeter --> 0.0603553 Meter (Check conversion here)
Drill Point Angle: 135 Degree --> 2.3561944901919 Radian (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

A = 0.5*D*cot(θ/2) --> 0.5*0.0603553*cot(2.3561944901919/2)

Evaluating ... ...

A = 0.0124999919105563

STEP 3: Convert Result to Output's Unit

0.0124999919105563 Meter -->12.4999919105563 Millimeter (Check conversion here)

FINAL ANSWER

12.4999919105563 ≈ 12.49999 Millimeter <-- Approach Distance

(Calculation completed in 00.020 seconds)

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Created by Kumar Siddhant

Indian Institute of Information Technology, Design and Manufacturing (IIITDM), Jabalpur

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National Institute Of Technology (NIT), Hamirpur

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< 7 Drilling Operation Calculators

Material Removal Rate during Drilling Operation using Feed

Go Material Removal Rate in Drilling = (pi*Machined Surface Diameter^2*Feed Rate in Drilling Operation*Rotational Frequency of Tool)/4

Material Removal Rate during Drilling Operation when Enlarging Existing Hole

Go Material Removal Rate = (pi*(Machined Surface Diameter^2-Work Surface Diameter^2)*Feed Speed)/4

Diameter of Drill Bit given Length of Approach

Go Diameter of Drill Bit = 2*Approach Distance/tan(pi/2-Drill Point Angle/2)

Material Removal Rate during Drilling Operation

Go Material Removal Rate in Drilling = pi/4*Machined Surface Diameter^2*Feed Speed

Machining Time for Drilling Operation

Go Machining Time = Length of Cut/(Feed Rate*Rotational Frequency of Drill-bit)

Drill Point Angle for given Length of Approach

Go Drill Point Angle = 2*atan(0.5*Diameter of Drill Bit/Approach Distance)

Length of Approach for Drilling Operation

Go Approach Distance = 0.5*Diameter of Drill Bit*cot(Drill Point Angle/2)

Length of Approach for Drilling Operation Formula

Approach Distance = 0.5*Diameter of Drill Bit*cot(Drill Point Angle/2)
A = 0.5*D*cot(θ/2)

Common Drill Point Angles

Drill point angles are given differently for various different machining conditions and different materials used as workpiece. The most used Drill Point Angles are: 1. 90° - for Softer Materials 2. 118° - for Soft to Medium hardness Materials 3. 135° - for Harder Materials.

How to Calculate Length of Approach for Drilling Operation?

Length of Approach for Drilling Operation calculator uses Approach Distance = 0.5*Diameter of Drill Bit*cot(Drill Point Angle/2) to calculate the Approach Distance, The Length of Approach for Drilling Operation is the required length the drill needs to move to achieve maximum engagement since the beginning of Tool-Workpiece contact. It's essentially the "dead travel" of the drill bit before it engages with the material. It plays a crucial role in several aspects of drilling such as - clearance of chips, Tool clearance, rapid entry etc. Approach Distance is denoted by A symbol.

How to calculate Length of Approach for Drilling Operation using this online calculator? To use this online calculator for Length of Approach for Drilling Operation, enter Diameter of Drill Bit (D) & Drill Point Angle (θ) and hit the calculate button. Here is how the Length of Approach for Drilling Operation calculation can be explained with given input values -> 12499.99 = 0.5*0.0603553*cot(2.3561944901919/2).

FAQ

What is Length of Approach for Drilling Operation?

The Length of Approach for Drilling Operation is the required length the drill needs to move to achieve maximum engagement since the beginning of Tool-Workpiece contact. It's essentially the "dead travel" of the drill bit before it engages with the material. It plays a crucial role in several aspects of drilling such as - clearance of chips, Tool clearance, rapid entry etc and is represented as A = 0.5*D*cot(θ/2) or Approach Distance = 0.5*Diameter of Drill Bit*cot(Drill Point Angle/2). Diameter of drill bit is essentially the straight distance across the widest part of the cutting edge (lips) of the drill bit. It determines the width of the hole it will create on workpiece & Drill Point Angle is the angle between the two cutting edges (lips) of a drill bit at its tip. This angle affects how aggressively the bit cuts and what materials it's suited for.

How to calculate Length of Approach for Drilling Operation?

The Length of Approach for Drilling Operation is the required length the drill needs to move to achieve maximum engagement since the beginning of Tool-Workpiece contact. It's essentially the "dead travel" of the drill bit before it engages with the material. It plays a crucial role in several aspects of drilling such as - clearance of chips, Tool clearance, rapid entry etc is calculated using Approach Distance = 0.5*Diameter of Drill Bit*cot(Drill Point Angle/2). To calculate Length of Approach for Drilling Operation, you need Diameter of Drill Bit (D) & Drill Point Angle (θ). With our tool, you need to enter the respective value for Diameter of Drill Bit & Drill Point Angle and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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