Laser Marking vs Dot Peen Marking Machines : An Overview of Two Popular Marking Technologies

Laser Marking

A laser marking machine is an innovative technology that marks objects with focused light. The process begins with the laser machine’s oscillator releasing a high-energy light (laser) which is then scanned by a mirror. The mirror and the focusing lens then work together and focus the beam on the target. Then, the beam hits the target and discolours the surface. In this process, heat absorption is the channel for marking.

Laser markers are popular across a diverse range of materials, including :

• Metal
• Ceramic
• Plastic
• Glass
• Rubber
• Paper

When it comes to processing, a laser marking machine creates the following :

• Text
• Logos
• Barcodes
• 2D Codes

Dot Peen Marking

Dot peen marking machines, also known as pin marking, are in a subcategory of engraving. A dot peen marking machine uses a pin to carve into a product. The pin, also known as a stylus, is made of carbide or diamond and cuts small but deep dots to form a design. These styluses are either handheld or automated, which differs from the strictly automated laser marking machine. Since the process involves carving, the result is an indented design, unlike the surface discolouration of a laser marking machine.

A dot peen marking machine relies on friction to sculpt designs, meaning that dot peen marking is limited to sturdy materials. The best success is with hard metals or plastics. On these materials, dot peen marking marks :

• Logo
• Text
• Number
• 2D Code

If you’re manufacturing for an industry that has products that shouldn’t be contaminated with outside materials, such as the food, pharmaceutical, or medical device industry, choosing a laser marking machine is the best choice. A laser marking machine discolours the surface for a permanent mark, unlike dot peen marking, which creates an indent that collects contaminates like dust.

On a similar note, a laser marking machine is also optimal if you’re marking sensitive materials like glass, plastic, paper, rubber, or cardboard. Laser markers use pointed heat absorption for marking, which doesn’t compromise the rest of the product.

Choosing a dot peen marking machine must only be on a strong product that is resistant to friction and unaffected by contaminants. Examples of products that are okay for a dot peen machine include thick pipes, tools, or tubes.

Pros

No Surface Damage

A laser marking machine uses high-energy light to discolour a product through heat absorption. This heat absorption can be set up so that it has no surface damage.

Diverse Marking Ability

Laser marking machines achieve a diverse range of marks across industries. Industries in which laser markers are used include :

• Automotive
• EV
• Semiconductor
• Medical
• Food and Pharmaceutical

Permanent and High Contrast

Since the laser marking machine uses heat absorption for marking, all marks are permanent and high contrast. Permanency and high contrast are particularly critical for industrial applications like traceability designs, which must be read by machines and/or humans.

Cons

High Upfront Investment

Laser markers are versatile, user-friendly, and create fantastic marks, but it comes at a price. Although laser markers are a worthy long-term investment, a laser marker may not be the best choice if your budget is slim for a short-term project.

Benefits

Deep Marks

A dot peen marking machine uses electromagnetic strikes for carving designs. Because of the cutting nature, the marks are deep and sturdy.

Good on Thick Materials

The intense nature of a dot peen marking machine is strong enough for any thick material. Industries like aerospace, defense, metalworking, and oil and gas may benefit from a dot peen machine.

Portable

Dot Peen marking machines are small and sometimes handheld, so they can be brought to a production site. This is particularly beneficial for traceability marks on large parts that can’t be transported to production sites easily.

Cons

Not Always Efficient

With some dot peen marking machines being handheld, it's not the most efficient choice. Handheld dot peen marks take time, energy, and extra costs. It takes time and money for an employee to receive training on using a dot peen marker. Then, the employee must do it by hand, which requires manual effort and frequent breaks in production.

Damages Some Products

Dot peen machines use a stylus to strike a material, which can be damaging. Using a dot peen on fragile materials damages the product and causes defects.

As mentioned above, dot peen marking machines require a particular type of material to work on.
Use a laser marking machine for these materials :

• Metal
• Glass
• Rubber
• Ceramic
• Resin
• Plastic
• Cardboard/paper

Use a dot peen machine for these materials :

• Hard metal
• Hard plastic

If you’re looking for a clean surface finish that does not have any processing flaws, choose a laser marking machine. KEYENCE’s marking machines use 3-axis technology to autofocus and create uniform marks across the entire product that are clean and precise.