KNOW WHY SECOND AND FOURTH ANGLE PROJECTION IS NOT USED IN ENGINEERING DRAWING !!

In Mechanical Engineering,drawings are made either in first angle projection or in third angle projection.We do not make drawings in second or fourth angle projection.We will discuss the reason behind doing so in this article.

Read this if you want to know difference between first angle and third angle projection.

DIFFERENCE BETWEEN FIRST ANGLE AND THIRD ANGLE PROJECTION EXPLAINED !!

Let us first understand the concept behind the angle projection system. Imagine you have Vertical Plane (VP) and Horizontal Plane (HP) (Perpendicular to each other),now we have 4 quadrants. For 1st angle projection system, we place object in 1st quadrant, for 2nd angle projection system, we place object in 2nd quadrant and so on.

In Second quadrant, Vertical plane (VP) lies in between object  and observer. Therefore front view of the object will lie on vertical plane whereas top view will lie on horizontal plane. As per rule of projection when horizontal plane is rotated 90 degree in clockwise direction, top and front view will overlap.

Overlapping projection views create confusion in the drawing. Therefore 2nd angle projection system is not used.

Similarly when object is placed in 4th quadrant both top and front view will overlap. Therefore fourth angle projection is also not used. 

To sum up, because of overlapping of front and top views 2nd and 4th angle projections are not used. First and third angle projection systems are recommended for orthographic projections.

KNOW WHY KTM IS FAST AND ROYAL ENFIELD IS SLOW !!

Royal Enfield despite of having 350 CC Engine is able to reach a top speed of 90-100 kmph whereas KTM Duke 390 is having 373 CC Engine is able to attain 160 to 165 kmph. Which simply means power of Duke 390 is way ahead of RE 350.

Now,coming to torque figures of both machine.Duke 390 produces 35 N⋅m @ 7250 rpm whereas RE 350 produces 28 Nm at 4000 rpm, which simply means maximum torque of RE 350 comes at very early stage whereas Duke 390 takes time to attain its maximum torque.In short we can say that RE 350 is a better pulling machine.

Now the question is that,what makes Duke 390 a fast machine despite of having almost same capacity engine.The technology used by Duke 390 is way ahead of RE 350. It uses DOHC,Liquid cooling and other latest technologies.Also Duke 390 is lighter than RE 350 but one thing that brings the drastic change is the construction of Engine.

Duke 390 uses oversquare engine 80.0mm bore and a 60.0mm stroke.The stroke is shorter than bore which helps in faster movement of engine as the distance to be covered in up and down motion is less.So,engine revs fast thus helps in attaining higher top speed.

On the other hand Royal Enfiled 350 uses undersquare engine 70 mm bore and 90 mm stroke.With longer stroke the engine becomes slow as distance to be covered is more.But this results in increased torque as,Torque=Force x Distance.

So,in this case engine revs slow which result in increased torque.

Click here to know more about oversquare,undersquare and square engine.

KNOW WHAT IS THE DIFFERENCE BETWEEN NET WEIGHT AND GROSS WEIGHT !

It is vital to understand weights when it comes to shipping goods. Weight is used to determine shipping costs regardless of whether the shipment is made by sea, air, rail, or road. The paperwork, quotes, and bill of lading will clearly indicate which weight the costs are based on for that shipping company.

Gross weight and net weight are two most commonly used terminologies used.We will understand the difference between gross weight and net weight in this article.

Net weight is the base weight of a product by itself. It is probably the term most people are familiar with, as they encounter it daily on food packaging. The net weight of a can beans is only the weight of the beans themselves and does not include the weight of the can.

The word gross means total. Thus, gross weight means total weight. The gross weight will include all aspects required for shipping. It includes the actual product, its packaging and any other packaging required to enable the shipping of the product.

There is one more terminology which is known as tare weight.Tare weight is the weight of the container in which a shipment travels. The weight of the container, full of your cargo, is what you will be charged to ship, or what you will pay to receive. Tare weight equals gross weight minus the net weight.

Summary:

1.Gross weight is the total weight of the shipment, including the raw products, its packaging, pallets, containers, and weight of transport vehicle.

2.Net weight refers to the weight of the raw product ordered. It does not include the weight of any container within which the product is held (e.g. a tin or box) or subsequent weight of pallets, larger containers, or the transport vehicle.