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V-Mixer Design and Fabrication: Step-by-Step Guide

How to develop a V-shell mixer using practical fabrication-focused tools

Learn how to design and fabricate a V-mixer (V-shell blender) step by step. This guide covers vessel development, trunnion shafts, gusset plates, discharge nozzles, and assembly using CaldereriaOnline.com sheet metal tools.

Jay Laverage
2026-03-03
Ljubljana, Slovenia

También puedes leer este artículo en Español.

Introduction: What a V-Mixer Is and Where It Is Used

A V-mixer, also known as a V-blender or V-shell mixer, is a type of industrial mixing equipment widely used to blend dry powders and granular materials. Its characteristic V-shaped vessel allows materials to split, tumble, and recombine repeatedly during rotation, producing a uniform and gentle mix without excessive shear. This makes V-mixers especially suitable for fragile materials, blends with different particle sizes, or products that must maintain their physical integrity.

V-mixers are commonly found in industries such as pharmaceuticals, food processing, chemicals, plastics, and specialized powder handling applications. From a fabrication point of view, they are an interesting piece of equipment because they combine complex sheet metal geometry, structural elements like shafts and reinforcement plates, and functional details such as discharge nozzles. In this article, we walk through the complete process of developing a V-mixer using CaldereriaOnline.com, based on a five-video series that covers the process step by step.

The goal is not only to show how the mixer looks when finished, but to explain how each component can be developed accurately for fabrication, cutting, and assembly using practical tools that fit the day-to-day workflow of a shop or small engineering office.

Video 1: Developing the Main V-Shell Vessel

The first step focuses on the heart of the equipment: the V-shaped vessel itself. The vessel is formed by two cylindrical sections joined at an angle. The concept is simple; yet, the development of these parts requires precision.

In this video, the mixer vessel is created by defining the key dimensions: diameter, and length of, and the intersection angle between, the two cylinders. In CaldereriaOnline.com, the platform generates the flat patterns needed for fabrication, after these parameters are entered.

For fabricators, this is critical. The accuracy of the sheet metal development directly affects weld fit-up, alignment, and final balance of the mixer. A well-developed V-shell means fewer adjustments on the shop floor, better weld quality, and less time spent correcting geometry.

The resulting designs can be printed for manual layout or exported as NC-ready files for plasma, laser, or waterjet cutting, depending on the shop’s capabilities.

Video 2: Trunnion Shafts and Gusset (Reinforcement) Plates

Once the main vessel is defined, the second phase moves on to the structural components that allow the mixer to rotate: the trunnion shafts and their reinforcement plates, commonly called gussets. These parts are essential for transmitting torque and supporting the vessel under load.

The trunnion shaft typically consist of a cylindrical shaft intersecting the vessel wall, or, the reinforcement plates. The challenge lies in accurately defining the intersection between the shaft and the curved shell.

The gusset plates add another layer of complexity. They are not flat plates randomly welded in place, but shaped reinforcements that must match the vessel curvature to distribute stresses properly. In this phase, the gusset plates are developed considering an auxiliary (imaginary) cylinder that fits over the main vessel. The unfolded development of the intersection of the shaft and this auxiliary cylinder gives a curve, which we next OFFSET a desired distance to get the gusset plate.

Video 3: Discharge Nozzle Development

The third step introduces the discharge nozzle, a key functional component of the V-mixer. This nozzle allows controlled emptying of the mixed material and must be positioned accurately to ensure complete discharge without compromising the vessel’s integrity.

The discharge nozzle is typically a pipe intersecting the V-shell at a specific angle and position. This creates a complex cut line on the vessel surface. Using CaldereriaOnline.com, this intersection can be developed precisely, producing both the nozzle pattern and the corresponding opening in the shell.

In this phase we used mirrored parts. Due to symmetry, we calculate one half of the container (and its hole). The other will be identical.

For the shop, accurate nozzle development improves fit-up, reduces weld gaps, and ensures that valves or accessories installed later align correctly.

... an interesting piece of equipment because they combine complex sheet metal geometry, structural elements like shafts and reinforcement plates, and functional details such as discharge nozzles...

Video 4: 3D Assembly of the Complete V-Mixer

In the fourth phase, all previously developed components are brought together into a 3D representation of the complete V-mixer. This includes the main vessel, trunnion shafts, and the discharge nozzle.

It is important to remember, that CaldereriaOnline.com is not a 3D-modelling CAD system. The goal of this step is not detailed mechanical modeling, but rather a practical assembly check. By aligning the 3D representations of each part, the user can visually verify proportions, positions, and overall coherence of the design.

The assembly is created by copying the applicable 3D parts from each drawing and aligning them using reference points; we use the ALING CAD command. This method allows fabricators and designers to confirm that shafts sit correctly, nozzles intersect as intended, and there are no obvious interferences before cutting material.

This phase is especially useful for communication. A simple 3D assembly can be shared with clients, supervisors, or shop personnel to explain the design intent.

Video 5: Alternate Method for Developing Gusset Plates

The fifth (and final) video presents an alternate method for obtaining the reinforcement plates. In the second video, we obtained it indirectly using the OFFSET command on the flat pattern's intersection hole. Here, a different approach is used.

In this case, we use a virtual auxiliary tube of the desired diameter for our reinforcing plate. Visually, this plate is perfectly circular when viewed from the end of the shaft towards the container.

What is important here is to know there can be different alternatives for obtaining component parts and you can choose the one that best suits your needs.

Complete Video Playlist

Each of these steps is covered in detail in a dedicated video. Watching the full playlist gives a clear, step-by-step view of how a complete V-mixer can be developed, from the main vessel to the trunnion shafts, gusset plates, and discharge nozzle.

Conclusion

Designing and fabricating a V-mixer involves much more than drawing a simple shape. It requires an understanding of geometry, fabrication constraints, and the interaction between structural and functional components. By breaking the process into clear phases, this series shows how complex equipment can be approached in a structured and manageable way.

CaldereriaOnline.com is built to support this kind of workflow: practical, parametric, and focused on real fabrication needs. From developing the main vessel to handling shafts, nozzles, and reinforcement plates, the platform helps reduce errors, save time, and improve consistency.

If you work with sheet metal equipment like mixers, hoppers, ducts, or vessels, these tools can become a valuable part of your daily process. We invite you to explore the full video series, test the tools yourself, and see how accurate development can make fabrication smoother and more predictable.

For more expert insights and tools to optimize your sheet metal workflow, stay tuned to our blog and explore our suite of online development tools designed to streamline your sheet metal design process.