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How To Expand A Pcb Prototype Hole


Miracle PWB explains the best procedures about How To Expand A Pcb Prototype Hole like a pro. Electronic circuit boards can be found almost anywhere these days. A PCB is likely to be found in any equipment or system that relies on electricity, particularly from a battery or other off-grid source, such as a solar panel.

You may be wondering why expanding the PCB hole is necessary. The solution is: The tiny boards used in wearables like watches and fitness monitors, for example, might have various geometries depending on the application. Every electronic device has a specific location.

In order to get the most out of your PCB board, it’s important to know what components you need and how big the standard size is. Drilling a PCB board will be less expensive as a result of this. This article has detailed instructions on how to widen a pcb prototype hole in case you find yourself in high demand.

How to use pcb prototype board 2021

What is PCB Drilling?

Before soldering or mounting components on an electronic circuit board, PCB drilling (printed circuit board drilling) is used to create holes, slots, and other cavities. Let’s learn about How To Expand A Pcb Prototype Hole.

PCB drilling is the most time- and money-consuming technique. It is imperative that the PCB drilling procedure be carried out meticulously, as even a minor inaccuracy might result in a significant financial loss. Drilling is done using a pcb drilling machine and it is one of the most difficult and time-consuming steps in the production of printed circuit boards.

How To Widen A Pcb Prototype Hole?

To widen a PCB prototype hole, an automated PCB drill bit is often used for this purpose, which is slightly smaller than the components placed on the board. Drilling is performed in the same manner as with a standard drill bit, with the exception of a small twist. Either electrochemical etching (chemical milling) or mechanical methods like drilling machine, laser cutting, or punching can produce the hole or mounting hole.

It is imperative that the PCB drilling procedure be carried out meticulously, as even a minor inaccuracy might result in a significant financial loss. Drilling is one of the most difficult and time-consuming steps in the production of printed circuit boards.

Chemical drilling and electrochemical etching are commonly utilized in board manufacturing process today. There will be a succession of holes board depending on how much it has been sculpted, and these holes will need to be filled.

What are the types of PCB drilling?

Using a PCB Hand Drill

When working with printed circuit boards, you’ll need a PCB-hand drill. In most PCB hand drills, a chuck holds the drill bit in position, which is a common feature. Using an Allen key or an Allen wrench, a PCB hand drill can be tightened. An instruction manual and the contents of the PCB hand drill package are included in the purchase price.

A Back Drill PCB

It is a type of drill that is specifically intended to drill holes in a printed circuit board. Hand soldering or insertion of wires or component leads into the holes is the reason for the name of the procedure. A blade is used to remove the top layer of the PCB, revealing the copper layer. Then, using a burr cutter, the copper that is exposed is removed.

A back drill PCB can then be equipped with components and electrically attached to its power supply circuit board when this has been completed.

The circuit board drill bit

One end of the circuit board drill bit has a sharp edge, while the other end has a flat surface. Using a circuit board drill bit, wires can be inserted or soldered into position via the holes. Make sure that the flat face of the circuit board drill bit is securely pressed against a surface to prevent it from sliding in any direction. As a result, the PCB will be drilled with holes that are at right angles.

PCB Drilling

What is mechanical drilling?

Mechanical drilling

However, precision is sacrificed for speed and simplicity when using mechanical drills. Drill bits are used in this pcb drilling process. These drills can only make holes as small as 6 mils (0.006″) in diameter.


When working with softer materials, such as FR4, the mechanical drills can be utilized for up to 800 strikes. The life expectancy drops to 200 counts with denser materials like Rogers.

Using a PCB drill bit to create a precise hole size and electrolytic etching to remove material from the hole, PCB drilling is a mechanical and chemical process. 2D or 3D drilling is a term that refers to the two different mechanical and chemical drilling procedures that are used.

For PCB manufacturering, failing to follow these guidelines can result in defective holes that will render the board unusable.

What is laser drilling?

Drilling using lasers

On the other hand, laser drills are capable of drilling much smaller holes than conventional power tools. No physical contact is made between the workpiece and the laser drilling instrument during this process. Using a laser beam, the material on the board may be removed and accurate holes can be made. Controlling the drill depth is very simple here.

Drilling vias with precise depth control is made possible thanks to laser technology. Precision drilling is possible down to a hole diameter of 2 mils (0.002 inches).


Copper, glass fiber, and glue are the main components of a circuit board. A variety of optical qualities can be found in the PCB materials used in these boards. Laser beams have difficulty cutting through a board because of this.

Laser drilling has a higher cost than other drilling methods.

Standard PCB Screw Sizes Explained

PCB standard screw sizes vs drill sizes.

PCB standard screw sizes

Screw PCB Drill Hole Size (mil) PCB Drill Hole Size (mm)
M1 39.37 0.75
M2 78.74 2.4
M2.5 114.17 2.9
M3 133.86 3.4
M4 177.16 4.5
M5 216.53 5.5
M6 259.84 6.6

What are the best practices for PCB Drilling?

In order to go to Expand A Pcb Prototype Hole, the PCB Drilling technique may now be addressed now that you are aware of what PCB Drilling is and how to execute it securely.

  1. Before drilling, thoroughly clean the PCB.

To begin, use a soft fabric cloth to wipe down the PCB board and remove any dust or other debris.

  1. Choosing The Correct Drill Bit Size

Sets of drill bits of various diameters are commonly available for purchase. Choose a size that is not broader than your component, but also not narrower than it. The other PCB components may be damaged or even disconnected if this is not done. The following dimensions are available:

Wire gauge drill bit: This is used for wires that are 0.8 to 1 mm thick.

Small drill bit: This size is for holes between 0.7 to 2 mm

Medium drill bit: This type is used for holes ranging from 2 to 10 mm thick

Large drill bit: This size is used for holes that are 5 mm or greater. It can be flat or round, depending on the manufacturer.

  1. Understand how fast to go with each drill type:

In metal, the speed and power of your drill dictate how quickly a hole is drilled. Some of the most popular choices for required holes drilling are:

High-speed bit: This type of bit can quickly drill through metal. Drilling at such speeds necessitates extreme safety precautions.

High-speed steel bit: Larger holes can be drilled by using a high-speed steel bit, which is ideal for drilling several PCBs that aren’t too thick.

Electroplated bit: These bits are used in the process of Drilling circuit boards and plating, as well as making holes in thick boards or using a high-frequency air hammer.

  1. Be Careful When Drilling – Safety Precautions

If you don’t have the correct equipment and supplies, drilling holes in a circuit board might be difficult. Before you try to Expand A Pcb Prototype Hole, the board can be damaged if you rush through the process of drilling holes, so take your time and be patient.

Never drill with a drill bit that spins too quickly or too slowly. Using goggles to protect your eyesight while drilling is also essential.

  1. How to Re-Clean a PCB After Drilling?

After you’ve finished drilling, you’ll need to use a brush and solvent to clean the holes. In the process of drilling holes in PCBs, metal shavings may be generated. When you’re finished, your board will be ready to go.

  1. Apply Solder to the Drilled Holes

Once you’ve finished drilling your PCB, you’ll need to fill the holes with solder and melt it with a soldering iron with a fine tip. Apply heat to one of the holes to verify that the solder adheres. Soldiers will not be able to flow through the holes if this technique is used. After that, give it a gentle squeeze to ensure it’s firmly attached.

When drilling a hole or a slot in your PCB, all you have to do is make sure the drill bits are clean and free of small pieces and debris. Any chips or debris on the bit could cause issues while drilling and lead to undesirable outcomes.

PCB Soldering


So we discussed about How To Expand A Pcb Prototype Hole, and we walk through with you explaining PCB drilling, or printed circuit board drilling, is a technique used to create openings, slots, and other cavities in a circuit board prior to soldering or mounting components to it. If you drill PCBs correctly, you won’t have to worry about breaking your drill bit. Using these hints, you should have no trouble drilling your PCBs.

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