KNOW WHY MANHOLES ARE ROUND IN SHAPE !!

You might have noticed that most manholes, and their covers, are round in shape.We will discuss the reason behind the round shape of manhole cover in this article.

1.Mishandling the Manhole cover-A round manhole cover cannot fall through its circular opening, whereas a square manhole cover could fall in if it were inserted diagonally in the hole.

2. Rolling the Manhole Cover -A round manhole cover is easily moved and rolled.

3. Strongest shape-When a square or rectangular manhole cover is subjected to sudden vertical compression (think of a very heavy truck driving over it), the weakest spot, the center, isn't equidistant to all supporting sides, especially the corners, which give support from two directions and are thus the strongest points (for similar reasons, experts recommend you stand in the corner of a room during an earthquake). With a circular cover, the center is equidistant from all supporting sides, and due to the gradual curve, any point along the edge gives almost as much support as a corner on a square cover. Circular shape results in uniform stress distribution.

4. Circular covers don’t need to be rotated or precisely aligned when placing them on the opening.

5. Round tubes are the strongest shape against the compression of the earth around them, so the cover of the tube would naturally be round as well.

6. It’s easier to dig a circular hole.

KNOW WHY HEADLIGHTS OF NEW MOTORBIKES ARE ALWAYS ON !!

You might have seen all two-wheelers which are launched after 2017 have their headlights always ON, we do not have an option to turn it OFF. In this article, we will discuss the reason behind always ON headlight in two-wheelers.

All new motorcycles and scooters that roll into the market need to feature AHO from April 1st, 2017 onwards. Most two-wheeler manufacturers term AHO as All-time Headlight On or Automatic Headlight On system. As the name suggests, new motorcycles and scooters which are sold and registered after April 1st, 2017 need to have the headlights on at all times. Yes, even during the day.

This is in compliance to a notice issued by the Road and Transport Ministry of India. All new bikes equipped AHO will not have a button to switch on the headlight, since it will always be on, but will only get high-beam and low-beam buttons along with the pass switch.

Why headlights need to be turned ON always:

This is a safety measure initiated by the ministry and is followed in many international countries. The idea behind this is that keeping headlights on throughout the day, even when the sun is nice and bright, makes spotting two-wheelers easier on the road. So, others on the road can see the motorcycle or scooter from a distance. It is also helpful during tricky light conditions during dusk, dawn or in case of sudden clouds casting a shadow. In short, it is a safety measure to increase the visibility of the two-wheelers on the road so that accidents can be prevented.


This will strain two-wheeler batteries a little more, but without hampering the battery in any way. Most modern motorcycles and scooters use advanced battery and alternators system, which can comfortably manage the extra load. This will no way alter fuel economy either. So, no need to worry.

Now-a-days most of the companies are coming up with DRL (Day-time Running Lights) on their motorcycle headlights as seen on the Bajaj Platina. This is basically a small, but fairly bright strip of light incorporated in the headlight console. This strip remains illuminated even if the headlight isn’t switched on, so that the on-coming traffic can clearly see the motorcycle or scooter approaching.

KNOW WHY WASHER IS USED WITH NUT AND BLOT !!

Washers are often used in conjunction with threaded fasteners. Washers consist of a flattened, circular- or disc-shaped piece of metal with a hole in the middle. Skipping on washers can dramatically reduce the lifespan of how your product is put together. Ultimately, that leads to disaster for the product itself. Not just any washer will do for all applications. Once you understand that, you can give washers the respect they deserve. In this article, we will discuss the use of washers with respect to nut and bolts.

Load Distribution

The primary purpose of most washers is to evenly distribute the load of the threaded fastener with which they are used. Threaded fasteners stress the material in which they are driven. For example, driving a screw into the wood may cause the wood to crack around the surface. Washers reduce the risk of such damage by evenly distributing the fastener’s load across the surface of the material. Not all materials require the use of washers. 

But for wood and other relatively soft materials, washers are useful to protect against stress-related damage when the threaded fastener is driven into the material.

Spacing

Washers can also be used as spacers. If the threaded fastener is longer than the depth of the object, you won’t be able to drive it all the way into the object — not without having some of the fastener stick out the back of the object, at least. Driving a 4-inch screw into an object that’s 3 inches deep will result in 1 inch of the screw’s tip protruding out of the back of the object. 

A simple solution to this problem is to use washers. Placing washers through the threaded fastener before driving it into the object creates padding so that the fastener doesn’t go too deep.

Vibration Absorption

Certain types of washers are designed to absorb vibrations. Known as vibration damping or vibration-isolating washers, they usually aren’t made of metal. Instead, they are made of a softer material like plastic, rubber or urethane. Softer materials such as these are more effective at absorbing vibrations than hard materials, including metal.

If a threaded fastener is being used to connect two objects, and one of those objects producing vibrates aggressively, using vibration-damping washers can protect the other object from damage.

Liquid Protection

Other types of washers prevent the ingress of water and liquids. They are often used in water pipes and connections to create a waterproof seal. Like vibration-damping washers, liquid-sealing washers are made of a soft material that’s able to press completely against the surface of the object.