Hammer Design

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Every-time we use the hammer, frequently we feel that pain in our hand. But there is the hammer which has pointer the hand should be place at the right stick and our hand have no feel pain if we use it.

hammer

So how to calculate the distance between hammer and pointer on the stick (O) for our hand is not feel pain? It mean the force reaction at the point (O) should be zero. We should learn dynamic theory especially about inertia force.


















The force F having moment M = F.(a+c) about O produces angular acceleration but at no angular velocity. If the applied force F is collinier with the resultant inertia force, the system is equilibrium without need horizontal reaction (Xo) at O. Hence the force of F shoul be applied a long line passing trough the center of hammer (P), that is a = ic^2/c. ic^2 is gyration radius.


































Result calculation with assumtion value of force and weight of the hammer found C=1m. It is difficult to application. This formula is suitable for impact test machine.












Next Flexible Suspension Cable Bridge http://mechanic-info.blogspot.com/2011/11/flex-suspension-cable-bridge.html

Bucket Elevator

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If we have small area between stockpile and silo, bucket elevator is the solution. Stockpile is area that we use to store the material at outdoors and silo is reserve material that just we use to process.

Usually ship bring the material like limestone, sand etc to stockpile and the loader bring the material from stockpile to bucket elevator and then bring up to the top silo.

Bucket elevator consist bucket, chain, sprocket, coupling and electric motor. Let's we think picture that I have 10 buckets on vertical left side contain limestone.

The Force:
1 bucket has 1kg, lift it vertically 20m need 15s and gravity force is 10m/s^2

(F – W) x h = [½ x m x V2] + [ m x g x h ]

[ F - (m x g)] x h = [½ x m x V2] + [ m x g x h ]

[F – (1kg x 10m/s^2)] x 20m = [½ x 1kg x 0m/s ] + [ 1kg x 10 m/s^2 x 20 m ]

[F – 10N] x 20m = [ 0 ] + [ 200N.m ]

[F - 10N] x 20m = 200 N.m

F = 20 N

Force F total for 10 buckets = 10 x 20N = 200N


The Power:
Power drive need for lifting 200N for 15s is P = F/t

P = 200N/15s = 13.3N/s = 13.3 Watt

class iv exams preparation.

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class iv exams for mariners.

Courses to be done before the exams:
ENGINE ROOM SIMULATOR COURSE AT: OPERATIONAL CL-IV LEVEL
>The course is open to Marine Engineers who wish to improve their knowledge and understanding of the operation and control of the machinery installation of a modern merchant ship and who wish to appear for MEO class IV Examination.
>To Officers in charge of an engineering watch at the operational level who wish to appear for the examination of MEO IV

ADVANCED FIRE FIGHTING(AFF)
This course is open to those seafarers who have completed a basic course in fire fighting; and
Are masters, chief engineers, senior officers and key personnel who may have to control fire fighting operations; and Must be certified by a doctor to be in good health
Must have approved sea-going service of not less than 12 months or have attended an approved pre-sea training course and have an approved sea-going service of not less than six months
Must be medically fit - ILO Format of Medical Fitness Certificate

PROFICINECY IN SURIVIAL CRAFT AND RESCUE BOAT (PSCRB)
Must have completed the course in Personal Survival Techniques
Must have approved sea-going service of not less than 12 months or have attended an approved pre-sea training course and have an approved sea-going service of not less than six months
Must be medically fit - ILO Format of Medical Fitness Certificate

MEDICAL FIRST AID (MFA)
An approved sea-going service of not less than six months
Passport
CDC


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