Selection Principles for Engineering Decisions

Selection Principles

Comparing Brushless Motors and Stepper Motors: Principles, Structures & Applications

We have many machines around us that have electric motors to operate, including simple tools and complex robots. Brushless DC (BLDC) motors and stepper motors are two popular options for high precision and performance. They are both electrically commutated motors and have no physical brushes, but operate in different ways and are appropriate for different applications. Key Takeaways The advantages of BLDC motors are high-speed, smooth, continuous operation, and high efficiency. Stepper motors can be u......

Sep 07, 2026

Selection Principles

DC Motor vs. Stepper Motor: What Are They and How Do They Differ?

To clearly distinguish between DC motors and stepper motors, this article uses brushed DC motors as the primary reference for comparison. A brushed DC motor is typically well suited for continuous rotation, high-speed operation, and variable-speed control, while a stepper motor is commonly used for low-speed positioning, indexing, and holding torque at standstill. When combined with an encoder and an appropriate controller, a brushed DC motor can also be used for closed-loop positioning. The right cho......

Sep 01, 2026

Selection Principles

Pillow Block Bearing Size Charts, Dimensions, and Measurements

Pillow block bearings combine a rolling-element bearing with a mounted housing, making them the default choice for supporting rotating shafts in industrial equipment. Selecting the wrong size or mounting style leads to premature failure, misalignment, and unplanned downtime. This guide covers four common pillow block bearing unit configurations, including mounted bearing units and flange bearing units, provides actionable dimension reference tables, and outlines measurement, selection, and replacement......

Sep 01, 2026

Selection Principles

The Engineering Logic Behind the V-Belt Size Chart

V-belt selection is based on transmission system operating parameters (e.g., power, speed, and transmission ratio) and the geometric relationships between pulley diameters and center distance. In practice, JLCMC engineers emphasize that, beyond standard size charts, relevant design formulas—such as power correction, wrap angle factors, and belt length calculations—must be applied to ensure the selected V-belt type, length, and quantity satisfy performance and service life requirements. Standard V-Belt......

Apr 07, 2026

Selection Principles

Universal joints：How to choose & Where to buy

What is a universal joint? The universal joint resides at the heart of any intricate mechanical system, a versatile mechanical component that seamlessly connects two rotating shafts, facilitating torque transmission and rotational motion across varying angles. Essentially, it's a bridge that ensures smooth power transfer, even when the axes are misaligned. The significance of selecting the right universal joint cannot be overstated, as it directly impacts the performance, durability, and efficiency of......

Mar 17, 2026

Selection Principles

Selecting Bearing Accessories for Optimal Performance

Bearing accessories play an important role in maintaining and improving mechanical performance. Learn how to select and replace the appropriate bearing accessories, understand the types, their uses, and how they affect mechanical performance. While bearing accessories may not be as well-known as the bearings themselves, does that mean they are any less important? Read on to discover their crucial role. What are bearing accessories and what functions do they Serve? Bearing accessories are not an indivi......

Feb 07, 2026

Selection Principles

Which Compressed Air Quick Connect is Best, and Where to Buy It?

Introduction Fig. 1 A picture of Air Hose Fittings and Quick Connect Air Fittings A compressed air quick-connect coupler is the cornerstone of any efficient pneumatic system. These small, unsung heroes allow you to rapidly swap between tools without bleeding the entire air system, ensuring maximum uptime and efficiency in your workshop or industrial setting. Choosing the right quick connect, however, can be surprisingly complex due to the multitude of standards and profiles on the market. The "best" c......

Oct 29, 2025

Selection Principles

One-Piece vs. Split Aluminum Enclosures: How to Choose

Introduction Aluminum itself is a versatile material used in many applications because of its rugged durability, lightweight and corrosion resistance; aluminum enclosures are no exception. To protect sensitive electronics or hardware, you need the right type of enclosure. However, you are always in the dilemma of one-piece and split aluminum enclosures. By contrasting these two choices, you will be able to choose the right one for your project. What Are One-Piece and Split Aluminum Enclosures? The mat......

Oct 18, 2025

Selection Principles

Spline Shaft Basics: What to Know Before You Buy

Fig. 1 A picture of Splined Shafts Your machine isn’t missing a bolt or belt, but something’s still off. Torque stutters. Alignment drifts. And after weeks of chasing minor faults, the real problem shows itself: a misfit spline shaft. In power transmission systems—especially in high-speed automation or retrofitted CNC lines—the shaft isn’t just a connector. It’s the spine of your drivetrain. When it’s underspecified or poorly matched to the hub, small errors become big breakdowns: backlash, chatter, p......

Jul 03, 2025

Selection Principles

The End Mill Buyer's Guide: How to Choose the Right Tool for Any CNC Operation

Fig. 1 A picture of a 4-flute, Ball Nose End Mill Pick the wrong end mill, and you’ll know it fast. The cut sounds off. Chips build up. Corners fray. Maybe the tool snaps before you even finish the pass. In machining, small choices lead to big consequences. And your choice of tool—especially in materials like aluminum, stainless, or plastic—is one of the biggest. Take a simple job: slotting an aluminum plate on a 3-axis mill. Use the wrong flute geometry; you’ll get chip packing, heat buildup, and a r......

Jun 24, 2025

Selection Principles

Selecting the Right Compression Spring: No Engineering Degree Needed

Fig. 1 A picture of Compression Springs A single spring—barely the size of your palm—can decide whether a thousand-ton press completes its stroke or stalls mid-cycle. It's easy to overlook until that overlooked spring becomes the reason your production floor falls silent. In high-force machinery like stamping presses, hydraulic actuators, and die setups, compression springs are the hidden workhorses behind every smooth return stroke, controlled impact, and appropriately timed motion. When these spring......

Jun 17, 2025

Selection Principles

How to Choose the Best Air Compressor Hose Fittings: Quick Connect vs. Hose Barb Explained

Introduction Picking the right air hose fitting is a small decision with big consequences. Whether you’re a weekend DIYer with a compressor in the garage or an engineer specing out an industrial air system, one thing’s for sure: you need a leak-free, durable, and flexible connection that works without headaches. When it comes to choosing fittings, you’ve probably encountered the two main contenders: quick-connect fittings and hose barb fittings. So, which one is the better fit for your setup? Let’s br......

Apr 23, 2025

Selection Principles

How to Select the Right Linear Shaft for Industrial Applications

What are Linear Shafts Linear shafts are also known as linear guide shafts, linear rods, or linear motion shafts. They are rod-shaped machined bars on which linear bearings move. The shaft's one or both ends usually possess mounting features, such as threads, to allow connection with other components or systems. These elements are critical in creating a linear guide system that is essential in supporting straight-line motion in various mechanical and industrial equipment. How do Linear Shafts Operate?......

Mar 25, 2025

Selection Principles

When to Use a Shaft Coupler?

Using the right shaft coupler in the appropriate context can significantly enhance transmission efficiency and effectively extend the lifespan of the equipment. However, determining when to use a shaft coupler is not always straightforward, as multiple factors influence the decision. Therefore, it is essential to deeply understand the specific needs of the system and choose the appropriate shaft coupler based on that understanding. Misalignment Between Shafts in the Transmission System One of the prim......

Feb 20, 2025

Selection Principles

O Ring Selection: How to Choose the Perfect One for Your Project

O ring is essential for creating dependable seals in industrial, automotive, and domestic applications. This small but powerful component successfully avoids leaks, can resist severe temperatures, and ensures that systems run smoothly. Follow JLCMC to learn about superior o ring solutions made to fulfill a variety of demands. This article will show you how to appropriately select an o ring and avoid frequent problems, allowing you to accomplish perfect sealing every time. Factors to Consider When Choo......

Jan 16, 2025

Selection Principles

Selection Strategies for Torsion Springs in Different Applications

What is a Torsion Spring? Torsion springs are a widely used type of mechanical spring, typically cylindrical with spiral winding. They extend linear or curved spring arms at both ends, enabling connection and securement of other components. With their ability to store and release torque, torsion springs provide support for loads or store energy in rotational motion. Due to their simple structure and versatile functions, they are widely applied across various fields. For engineers, it is crucial to sel......

Dec 30, 2024

Selection Principles

Picking the Right Gas Spring for Your Project

Since the invention and application of gas springs by German engineer Johannes P. Liebich in the 1940s, gas springs have become indispensable components in a wide range of industrial, mechanical, and automation equipment. Choosing the right gas spring is crucial to the success of a project, as it can significantly improve equipment stability, operational efficiency, and extend the lifespan of the equipment. Therefore, JLCMC provides guidance on how to select the right gas spring, helping designers and......

Dec 09, 2024

Selection Principles

A Guide to Selecting the Right Rigid Coupling

Introduction Rigid couplings serve in applications that require perfect or near-perfect alignment of shafts for accurate torque transmission. Their proper selection contributes to the reliability, fewer failures, and overall optimum performance of a system. Some of the factors to be considered during such a selection process involve torque capacity, shaft compatibility, and material properties among others. These go a long way in improving the efficiency and durability of such couplings. 1. Key Factor......

Dec 09, 2024

Selection Principles

How to choose between aluminum and steel corner brackets

Corner brackets, essential in connecting and supporting equipment and components, provide stability and alignment for heavy-duty machinery and structural assemblies. Due to the diversification of application fields nowadays, there are various types of corner brackets to choose from, of which steel and aluminum are the more common two materials. In this article, we mainly introduce the difference between these two and how to go about the selection. Materials Characteristics for corner brackets Aluminum......

Dec 09, 2024

Selection Principles

How to Choose the Right Fasteners for Safety & Stability

Introduction Fasteners are often overlooked since they carry high vital importance contributing towards the secure and stable nature of different projects especially through construction, manufacturing or even DIY. Choosing the correct fastener is essential for project reliability, longevity, and safety. The guide offers a summary of the fundamental considerations during fastener selection including load requirement, material, thread types and coatings. A careful analysis of these factors helps ensure......

Dec 09, 2024

Selection Principles

Types of Pressure Sensors: Finding Your Perfect Match

Following our previous in-depth exploration of pressure sensors in the comprehensive guide "Understanding Pressure Sensors: A Complete Guide," JLCMC is excited to continue our journey with you today as we delve further into understanding the different types of pressure sensors that best fit your needs. Absolute Pressure Sensors Absolute pressure sensors measure pressure from zero—like comparing how deep you are underwater to being at the surface. At sea level, the pressure is about 101.325 kPa, which ......

Dec 09, 2024

Selection Principles

Types of Casters: How to Choose the Right One for Your Task?

Do you need help making a decision? Learn about casters and how to choose the right ones for various surfaces and applications from JLCMC, a supplier of mechanical components. Rigid Casters Rigid casters are straight-shooting, heavy-lifting champions. Their straightforward, tough-as-nails design is perfect for hauling weight and keeping your roll straight down the line. In environments where straight-line precision is paramount, such as warehouse chaos, rigid casters are your rock, ensuring that your ......

Dec 09, 2024

Selection Principles

How to choose a handle, read and you will!

This Built-in Round Handle used from ABS plastic, with high thermal type and flame retardant properties, can adapt to the environment, the ability to adapt to the environment, in a more adverse environment and can also be used normally: the lock tongue with the impact function, the pull handle can be completely embedded in the lock body, greatly saving the external space, can reduce the collision of foreign objects or damage to the chances of the pull handle lock! Advantages Good insulation, reduces t......

Nov 04, 2024