Category: HOW TO

Selecting the right rail for an overhead crane is crucial for ensuring optimal performance, safety, and cost efficiency. Here’s a detailed comparison of when to choose an “A” rail (standard “A” profile rail) versus a “rectangular” rail.

When to Choose Crane “A” Rail

1. Heavy-Duty Applications.

The “A” rails were ideal for lifting and moving heavy loads intensively due to their higher strength and load distribution capabilities. “A” rails are designed to evenly distribute the load across the rail, reducing stress concentrations and improving durability. The flanges and railhead are shaped to optimize load bearing and wear resistance.

2. High Usage Frequency.

It was preferred for operations with frequent crane use, thanks to their durability and wear resistance. “A” rails are specifically designed to withstand the rolling and lateral forces exerted by crane wheels, minimizing wear and extending the rail’s service life.

3. Standardization.

Conforming to international standards (e.g., GB, ASCE, DIN, JIS, ASTM, BS, EN, AUS, ISCOR), these rails ensure compatibility with a wide range of crane wheels and components. Standardized components simplify the maintenance, and replacement, unlike rectangular rails, which may not conform to stringent standards and could lead to compatibility issues.

4. Compatibility.

The rail profile is specifically designed to match crane wheel profiles, ensuring smooth and efficient operation, reducing rolling resistance, and minimizing wear. Rectangular rails may not provide an ideal running surface for crane wheels, leading to increased wear and reduced efficiency.

5. High Safety Standards.

Designed and tested to meet high safety standards, “A” rails ensure reliable operation under heavy loads and dynamic conditions typical in crane operations. Rectangular rails may not meet the same level of safety and reliability, especially under dynamic conditions.

6. Versatility.

Suitable for a wide range of load applications and environments, “A” rails can support various types of cranes and load capacities, making them a flexible choice for different industrial needs.

7. Ease of Maintenance:

Standardized mounting and alignment systems make rail replacement and maintenance straightforward. Standard profiles ensure replacement parts are readily available and easy to install, often replacement just by bolting compared to rectangular rails, which may require welding and precise alignment works.

When to Choose Rectangular Rail

1. Ease of Installation.

Much simpler configuration with fewer accessories compared to A profile rails, easy and fast installation at a lower cost. Thus, it was widely recommended for light-duty cranes.

2. Custom Applications.

More flexible compared to “A” profile rail, suitable for custom-designed rail which able to fit specific constraints. Rectangular rails can be easily modified or shaped for various layouts, including curved, diagonal and etc, to suit the required application.

3. Low to Moderate Loads.

Rectangular rails are best suited for cranes handling lighter loads or those used less frequently, such as for periodic maintenance. They are cost-effective for lighter applications, particularly when the crane has less optimal load distribution or lower stress concentrations. Rectangular rails provide most practical and economical solution for scenarios that do not involve heavy loads.

4. Specific Design Requirements.

Rectangular rails can be tailored to meet unique specifications more easily when integrating with custom-designed structures or machinery, compared to “A” profile rails. This flexibility makes them ideal for specialized applications where standard configurations may not suffice. Customization options include modifications in dimensions, mounting methods, and material choices, allowing rectangular rails to seamlessly fit into diverse industrial setups.

5. Cost Considerations.

If the initial budget is a primary concern and the load conditions are within acceptable limits, rectangular rails offer significant cost savings, as they generally have lower upfront costs compared to “A” rails. Rectangular rails provide an economical alternative without compromising the essential functionality needed for lighter load applications, making them an attractive choice for decision-makers.

6. Non-Standard Environments:

In non-standard environments, rectangular rails offer a distinct advantage due to their ability to be customized to fit unique spatial constraints or specific operational conditions where standard “A” rails may not be suitable. This customization includes adjustments in size, shape, and installation methods, enabling rectangular rails to seamlessly integrate into spaces with irregular dimensions or unconventional layouts.

7. Short-Term Projects.

For projects with a shorter expected lifespan where long-term durability is less critical, rectangular rails may be the most economical choice due to their lower initial costs and adequate performance for temporary or less demanding applications. This makes them an ideal solution for projects that do not justify the investment in more durable, high-cost options like “A” rails, as the financial savings from choosing rectangular rails can be significant.

Conclusion.

In summary, the decision to use an “A” rail or a rectangular rail should be based on a careful analysis of the specific requirements of your overhead crane application. Evaluating factors such as load characteristics, environmental conditions, cost, and operational demands will help you make an informed decision.

• Crane “A” Rail: Best for heavy-duty, high-frequency use, requiring standardization, durability, and long-term cost efficiency. Ideal for applications demanding high safety standards and compatibility with standard components.
• Rectangular Rail: Suitable for custom or low-load applications, specific design requirements, short-term projects, and where initial cost savings are important.

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What is toastmasters?

Toastmasters is an international non-profit organization which genuinely provide supportive and positive learning experience with no hidden agenda, empowering members to develop competent communication and leadership skills. The organization mission was to teach public speaking and leadership skills through a worldwide network of clubs.

Why join toastmasters?

If you are looking for an establish reputable organization specialized in building leaders, growing professional speakers, and becoming a competent communicator. There is none other than Toastmasters International with 100 years of history having 15,900 clubs in almost 150 countries. Toastmasters International was establish since 1924, in the past 100 years ago it has helped millions of people in communication, public speaking, and leadership. The history speaks for itself.  With clubs in 150 countries, Toastmasters provides a unique platform to enhance language fluency. While toastmasters focuses on English language, the members can actually practice and improve proficiency in other chosen language as well, depends on the club they have joined.

How toastmasters club works?

A typical Toastmasters club is made up of 20 to 30 people who meet once bi-weekly for about 2 hours. In the meeting the members were given opportunity to participate in Table Topics, deliver a prepared speech, or fill a meeting role. Becoming the member allowed you to access all the available resources online at toastmasters international portal, join all toastmasters activities including from other clubs and enroll with toastmasters pathways a guided program to ensure your communication and leadership goals were met. Don’t worry as a newcomer, you will be assigned with a mentor to guide you along the process.

Why pay more when you can pay lesser?

Why pay thousands of ringgits or dollars for seminars or courses when you can just join Toastmasters club for a fraction of the cost while receiving highest value in proper proven structured syllabus with clear pathway and tons of resources available from toastmaster international? Since it a not-for-profit organization, it is very affordable to become the member and gain all the resource you need to become better a Leader and Communicator. As on now in year 2024, you just need to pay a one-time registration fee of USD20 to toastmasters international to become the member. 

Why I joined toastmasters?

I noticed the importance of first impression and how a stranger interpret you was based on how good you can deliver your message, not your education level nor financial background.  Thus, I took my first step to join toastmasters and enrolled in the Presentation Mastery Pathway. I must say that toastmasters has been a game-changer for me. It has provided me the platform to conquer my fear of speaking in public, fine-tuned my presentation and stay connected with like-minded individuals.

My experience with toastmasters.

Toastmasters clubs provide a supportive environment to enhance public speaking at my own pace. Engaging in activities such as prepared speeches, Table Topics, and meeting roles has boosted my confidence in communication. Constructive feedbacks from fellow evaluators aided my skill development, while the Pathways learning experience offers a structured program for becoming a more effective speaker. Toastmasters is beyond communication; it facilitates networking and social connections among individuals of diverse backgrounds. I can build relationships with like-minded individuals striving to develop similar skills, cultivating a supportive community for personal and professional growth. Club roles, such as my position as Vice President of Membership, also offered a valuable leadership experience to myself. Overall, Toastmasters significantly boosted my workplace confidence, enabling me to articulate ideas clearly, speak with confidence, and excel in diverse professional situations.

Register as a lifetime toastmasters member for free.

I strongly encourage those want to enhance communication and leadership skills, whether for presentations, confidence-building or business and career advancement, to join Toastmasters. Open to individuals over 18, a one-time USD20 registration fee is required while membership fees vary based on the club you have joined. 

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Success is something we all strive for in our life. Whether it’s in our personal or professional lives, we all want to achieve our goals and reach our full potential. Culmination of good practice and discipline over a period determined how successful we are. However, there are certain habits that can hold us back and prevent us from reaching our goals.

Here are 10 bad habits we must break to become successful.

[1] Procrastination:

Procrastination is the enemy of success. It’s easy to delay or put off tasks and responsibilities, but this only leads us to stress and missed opportunities. To break this bad habit, try goals setting, prioritize tasks and gives deadlines to our own selves. It is important to work on them promptly and holding ourselves accountable.

[2] Phone, Movies & Social media addiction:

Technology has become an essential part of our lives, but it can also be a distraction. Excessive use of phones, watching a lot of movies, and scrolling through social media can be addictive. It will take up our valuable time and prevent us from being productive. To break this habit, try limiting our screen time and setting boundaries for when and how often we check our phones, watching movies, or browsing the social media.

[3] Negative self-talk & Mindset:

The way we speak to ourselves and the beliefs on our abilities can have a major impact on our success. Negative self-talk and a negative mindset can prevent us from taking risks and pursuing our goals. To break this habit, cultivate positive self-talk, have positive mindset, and focus on your strengths and accomplishments.

[4] Fear of failure & not taking risks:

Fear of failure is a common obstacle that can hold us back from taking risks or trying new things to achieve our goals. But failure is often necessary part of the learning process for growth and success. To break this habit, try reframing failure as a learning opportunity and taking calculated risks to achieve your goals.

[5] Lack of exercise & unhealthy lifestyle:

Our physical health is closely linked to our mental health and success. A lack of exercise and an unhealthy lifestyle with poor eating habits can lead to low energy levels and decreased our productivity. To break this habit, prioritize regular exercise and plan a healthy diet.

[6] Complaining:

Constant complaining and having a pessimistic attitude can create a negative atmosphere and hinder productivity. It can drain our energy and hold us back from achieving our goals. To break this habit, focus on solutions rather than problems. Practice gratitude and cultivate positivity in our daily life.

[7] Perfectionism:

The pursuit of perfection can lead to procrastination which become a hindrance to progress toward success. It’s important to remember that perfection is unattainable, and progress is more important than perfection. To break this habit, embrace imperfection, set realistic goals, and focus on taking action to progress toward success.

[8] People pleasing:

Trying to please everyone can lead to burnout and a lack of productivity. Constantly seeking the approval of others can prevent us from making decisions that align with our values and goals. To break this habit, set boundaries, practice saying no and prioritize the actions that are in our best interest.

[9] Laziness:

Laziness and lack of efforts can prevent us from being productive to reach our full potential.  To break this habit, cultivate a strong work ethic, set daily goals, and be accountable to realize the goals.

[10] Lack of self-discipline:

Without self-discipline, it can be difficult to develop and maintain good habits. Self-discipline is vital for achieving any success. To break this habit, create daily habits and routines that align with your goals. Stay focused and hold yourself accountable for sticking with those defined priorities

Breaking these bad habits may not be easy, it requires a lot of effort and dedication to personal growth. By identifying and addressing these habits, we can become more productive, fulfilled, and successful individuals. Success is not achieved overnight, but by making small changes in our habits, we can move closer to achieving our goals and reach our full potential. Hope this article give some insights to become the best versions of ourselves and live a more fulfilling life.

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Step 1: Calculate the required Active Power (in Watt)

First, we need to determine the total electrical power consumed by this welding machine. Taking the reading of welding machine’s output voltage and current, we can determine the total required power by using Watt’s Law.

From the datasheet, the rated output voltage is 26.4 volts, and the maximum output current is 160 Amperes.

Based on Watt’s Law for single phase,

Power = voltage x current (P = V x I).

Therefore,

Power = 26.4 Volts x 160 Amperes

Power= 4.224 kW.

Step 2: Convert KW to kVA.

A generator is normally measured by apparent power kVA. However, the earlier obtained value was in active power, kW. Thus, we need to convert the active power to apparent power by dividing the active power with 0.8 based on power factor ratio rules.

Power factor rules refer to

Active power / Apparent power = 0.8

International standards state that generators’ power factor was fixed at 0.8.

Therefore, the apparent power is

Apparent power = Active power / 0.8

Apparent power = 4.224 kW/0.8

Apparent power= 5.28 kVA.

Step 3: Safety Margin for Generator

We need to identify whether the generator will be our primary power source or just a standby. A standby generator should not be operated at maximum capacity for more than 30 minutes.

For this case study, the welding machine will need to continuously draw power from the generator; thus, it is considered our primary power source.

Since the generator was considered main power supply, we need to have a reserve of 30% safety margin as a rule of thumb in sizing the generator.

Therefore, the apparent power of 5.28 kVA needs to be multiplied by 1.3 as a safety margin.

This concludes that the minimum required generator size is

5.28 kVA x 1.3 = 6.9 kVA.

From the calculation, it is concluded that we need a minimum of 7 kVA or recommended 8KVA for a welding machine with a maximum current level of up to 160VA.

The following table puts together the minimum and recommended generator sizes required for a welding machine for your quick reference.

The circuit breakers in common electrical installations only protect against overloading and short circuits. Therefore, RCDs were required to provide another layer of protection in addition to circuit breakers and fuses. It acts as sensitive safety device that triggered off the electricity within 10 to 50 milliseconds when there is an earth faults or leakage detected at a harmful level to human, typically 30mA. RCDs were designed with two major objectives, to protect against the risks of electrocution and to minimize the risk of fire caused by earth faults

Technically RCDs worked on the current balance principle, Kirchhoff’s Current Law, which means that the electrical current meeting at any point in the circuit must be zero to remain operational. Protection was achieved by constantly monitoring the in-going and out-going current flow through one or more circuits that used to protect.

During fault, the phase and neutral current become unbalanced. The will current flow via unintentional path down to earth and the RCD will detect this fault and immediately switch off the circuit saving lives from electrical shock and prevent fire hazards.

Type of RCDs.

Often time, people mistakenly referred RCD as RCCD. Actually, RCD was just a family name. In this RCD family, we have several similar function devices but come with difference features and applications.  There are many ranges and type of devices fall under the RCD family.  Following are some the type of Residual Current Device available in electrical installation:

1.      RCCB (ELCB – Earth Leakage Circuit Breaker)

(Residual Current Operated Circuit-Breaker without Integral Over-current Protection)

A residual current circuit breaker which not integral with over current protection. It is a mechanical switching device designed to make, carry and break currents under normal service conditions by comparing the predetermined value of residual current and to cause the opening of the contacts when the residual current attains a given value under specified conditions. It is not designed to give protection against overloads and/or short-circuits and must always be used in conjunction with an over-current protective device such as a fuse or circuit-breaker. It is mainly used in consumer units and distribution boards.

2.      RCBO (RCD +MCB – Combination of RCD with Miniature Circuit Breaker)

(Residual Current Operated Circuit-Breaker with Integral Over-current Protection)

A residual current circuit breaker which integral with over current protection. It is a mechanical switching device designed to make, carry and break currents under normal service conditions and to cause the opening of the contacts when the residual current attains a given value under specified conditions. In addition, it is designed to give protection against over current, overloads and/or short-circuits and can be used independently of any other over-current protective device within its rated short-circuit capacity. It is mainly used in consumer units and distribution boards

3.      MRCD (Modular Residual Current Device)

An independently mounted device incorporating residual current protection, without overcurrent protection, and capable of giving a signal to trip an associated switching device.

4.      CBR (Circuit-Breaker incorporating Residual Current Protection)

A circuit breaker providing over-current protection and incorporating residual current protection either integrally or by combination with a residual current unit which may be factory or field fitted. According to the number of connecting poles, RCD may be two poles for single phase supply with phase and neutral whereas for three phase supply, four poles for three phase supply with neutral. Mainly used in distribution boards in a larger installation.

Note: The RCBO and CBR have the same application, both providing over-current and residual current protection. In general, the term RCBO is applied to the smaller devices whereas CBR is used for devices throughout the current range, with ratings up to several thousand amperes, single and multi-phase.

The RCBO and CBR are more strictly defined by the relevant standards.

5.      RCM (Residual Current Monitor)

A device designed to monitor electrical installations or circuits for the presence of unbalanced earth fault currents. It does not incorporate any tripping device or over-current protection.

6.      SRCD (Socket-Outlet incorporating a Residual Current Device)

A socket-outlet or fused connection unit for fixed installations incorporating with RCD, an integral sensing circuit that will automatically cause the switching contacts in the main circuit to open at a predetermined value of residual current.

7.      PRCD (Portable Residual Current Device)

A device comprising a plug, a residual current device and one or more socket-outlets (or a provision for connection). It may incorporate overcurrent protection. Mainly used as portable outdoor units for protection against direct contact