Understanding the Role of Bead Blasting in CNC Machining(tac welding Elmer)

CNC (Computer Numeric Controlled) machining has revolutionized the manufacturing industry since its onset during the mid-20th century. This technology presents a plethora of methods for crafting intricate parts with high precision and accuracy. One technique that gained significant popularity over recent years within CNC machining processes is ‘bead blasting’.

Bead blasting, at its most basic level, refers to the process of removing surface deposits by applying fine glass beads at high pressure without damaging the underlying material. It’s essentially an operation for deburring, cleaning or cosmetic finishing of a component manufactured through CNC machining.

The Procedure

A bead blasting machine propels, via high velocity, a stream of round abrasive particles (or ‘glass beads’) onto a component’s surface. The machine works much like a sand-blaster, using compressed air as the force. Technicians can adjust the air pressure depending on the desired impact strength and finish required. This procedure doesn’t change dimensional tolerances and offers a uniform texture and appearance, making it widely accepted among various industries such as automotive, medical, aerospace, etc.

Required Materials

To perform bead blasting, we primarily need two key materials – the media (glass beads) and premium grade aluminum oxide. Glass beads employed in bead blasting come in varying sizes, which gives control over the outcome. Bigger beads offer a rougher finish due to their higher impact strength while smaller ones present more mild outcomes ideal for delicate components. Aluminum oxide is often used to enhance the abrasive power of the glass beads.

Application in CNC Machining

In terms of CNC machining, bead blasting serves as a post-processing step performed after manufacturers have fully formed the metal part. Fundamentally, beads are propelled against the finished machined piece to remove any dust, paint layer, rust, or other superficial imperfections, thereby improving both aesthetic appeal and functionality.

Moreover, bead blasting is a profitable approach to maintaining and restoring worn-out CNC machine parts. For instance, periodic blasting can prolong cutting tools’ life span by removing built-up residues without affecting original structure of the part.


A critical aspect of bead blasting in CNC machining is assessing the optimal parameters like air pressure, bead size, and blasting time for achieving desired results. Since it involves the use of high-velocity projectiles, appropriate safety measures should be observed during operation. It’s equally important to acknowledge that although bead blasting ensures an attractive matte finish, precise control is vital as over-blasting might lead to altering component dimensions.

Bead blasting is significant not only for improving final product quality but also for expanding potential applications of several machined components. Surface pretreatments via bead blasting facilitate better adhesion when applying paints or coatings on the metal surface, therefore imparting enhanced resistance against corrosion or wear.

tac welding

In conclusion, bead blasting has become an integral strategy within CNC machining processes. It heightens the value of manufactured parts and extends their durability through proficient cleaning and finishing functionality. When done correctly, this technique can uplift the qualities and longevity of products coming out from CNC manufacturing units.
Naturally, there would be continuous technological advancements leading towards more efficient and safe ways of conducting bead blasting operations while delivering superior outcomes. Continual knowledge update would certainly aid businesses remain competitive and provide optimally finished CNC machined parts.

Want.Net Technical Team

Want.Net Technical Team

The Want.Net Technical Team has diverse members with extensive education and training in CNC machining. They prioritize precision, efficiency, and innovation to provide high-quality manufacturing solutions globally.

Push Your Order into Production Today!

Table of Contents


You’re one step from the  factory-direct price of part manufacturing services.