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Saturday, 8 April 2017

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Measuring instruments: Micrometer screw gauge vs vernier caliper


Vernier caliper and micrometer screw gauge


Measuring instruments: Micrometer screw gauge vs vernier caliper

What is measurement?

     This is the bedrock of the trade and statistics used for centuries now. It is the ability of one to ascertain the height, size and quantity of something by comparison.
   
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Sunday, 26 March 2017

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Physics: Introduction to radioactivity,types and properties.

radioactivity

Radioactivity

It is a spontaneous emission of radiation from a substance usually an unstable   .This process is also known as nuclear or radioactive decay). In the year 1896, Henri Beckerel a French scientist working with phosphorescent materials discovered that a uranium compound placed on a photographic plate which was covered with light black paper causing the plate to be exposed by blackening the pate itself. This implied that some sort of radiation was coming from the uranium which could pass through. The material was radioactive given-off radiation. Other scientists that researched on radioactivity were;v This radioactivity was spontaneous with the radiation being omitted without anything causing it apparently.

Types of radioactivity

From several experiments that have been carried out, it has shown that there are three different types of radioactive emission called;
 Alpha particles ; whose emission is easily stopped by paper or thick card
 Beta particles ; whose emission is easily stopped by aluminum sheet of different thickness and are negatively charged.
Gamma particles ; whose emission is easily stopped by thick sheet of lead.

types of radioactivity


Properties of alpha particles

      1)  Alpha rays are deflected by magnetic field.  
      2)      The direction of deflection of alpha rays shows that they are positively charged
      3)      They are relatively massive and so have more momentum and tend to continue in their direction of travel.
      4)      Alpha particles are absorbed by paper and air and are easily stopped aluminum thin sheet.
      5)      They have little penetrating power, traveling no more than 5cm. Being large, it is soon stopped by air molecules.
      6)      They are capable of stripping electrons from their atoms because alpha particles have comparatively large mass and momentum.


Properties of beta particles

     1)      There are also deflected by magnetic field but in the opposite direction to alpha particles.
     2)      The direction of deflection of beta rays shows that they are negatively charged with –e .
     3)      They are relatively light and as a result easily deflected.
     4)      They are deflected by different amount showing that they have varying speed..
     5)      They have good penetrating power of about 1 metre.
     6)      They can penetrate a few millimeter of aluminium.
     7)      They produce less ionization in air than alpha particles.

Properties of gamma rays

    1)      They are electromagnetic waves similar to light wave but of very short wavelength.
    2)      They are electrically uncharged since they are not deflected by a magnetic field.
    3)      They are highly penetrative compared to the other two types and can only be stopped by thick lead blocks.
   4)      They have high penetrating power compared to the other two types.
   5)      They have much less ionization than alpha rays.
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Saturday, 18 March 2017

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Physical and chemical change; differences and definitions


LEARN MORE ON PHYSICAL AND CHEMICAL CHANGE
All explanations are put in the simplest and easiest ways possible for fast comprehension. Enjoy.

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Sunday, 12 March 2017

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Physics: Thermal, linear, area and cubic expansivity

Thermal expansivity

Expansivity

 This is defined as amount a material expands or contracts per unit length, per-degree change in temperature.
The addition of heat will usually cause expansion of the body. during expansion, the dimension of the body increases.

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Friday, 10 March 2017

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General maintenance of film rollers of a machine





Maintenance of film rollers.
This part of an industrial machine contain a certain number of rollers rotating at different speeds. If a film passes through these rollers, it would be stretched out length-wise or width-wise depend on its specification and function. In most cases, the occurs at high temperature for smooth operations and the bearings and materials used must be able to withstand the set temperatures.

Learn how to maintain the film rollers of your equipment and keep the in excellent condition. This part of an equipment is found in fill/seal packaging machinery used in the paper or plastic industry.
    Be sure to also put safety first in any maintenance carried out.


Importance


  • To maintain standards
  • To minimise waste
  • For easy sealing
  • To stretch out fibres




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                                   Safety Check:      
                          
           (1) Use vacuum cleaner to clean.               
 (2)  Wear all your protective wears (eye goggle, hand gloves, nose mask, an overall )


 Tools
:
Eye Goggle, Nose Mask


 Task
:
Inspect/Clean The Film Rollers
.


 Why:
Ensure Free Movement Of The Film Rollers.
Procedures
1. Put on all required recommended professional and protective equips.
  1. Check for buildup on the Film Rollers.
3. Check if the Films are moving Freely and Properly without friction.
4. Check the rollers have any dent on its surface.
5. If there's build up on the Film Rollers Use clean rag to Thoroughly Clean The Film Rollers.

READ ALSO: 
·         Oil level check
·         Oil consistency check

Conclusion
 The is basically just a general means of maintaining machine film rollers. The are numerous machine design, dimensions, materials of contruction etc. In most cases, these rollers may be made of metal alloy, because of its strenght and ability to withstand high temperatures, but some other manufacture may decide to use other materials that best fits their design. Remember to always read the machine manuals.

3013384992
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