Hacksaw: A Non-Powered Hand Tool for Cutting Thinner Materials - Essay Sample

Introduction

In this case, there is a hacksaw non powered hand tool. It is fine-toothed in nature since it has a thin blade. It has been designed for use in the cutting through the thinner metals as well as the plastics and woods. Following its design, its use in the cutting through thicker materials can prove to bring about some difficulty in the long run, since its blade is thin hence can get broken or damaged. it is easy to replace the blades of the hacksaw when they become blunt following the long-term use of the tool. Also, there are various ranges of the hacksaw which have been suited to serve different functions.

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Most of the hacksaws have been designed as handsaws which have c shaped frames which hold the blade used in cutting under tension. They also have handles, a pistol grip, which has the pins used in attaching the thin disposable blade. The frames of the hacksaws can also get adjusted for it to accommodate the blades with different sizes. In most cases, there is the use of a screw in putting the thin blade under tension. The blades in most of the hacksaws can be mounted where the teeth can be facing to or away from the handle, where the cutting action results in which here can either be the pulling or pushing stroke. However, most of the hacksaws have their blades in such a way that the teeth are facing away from the handle.

In this regard, the hacksaws are designed for the use by such people as the electricians or plumbers in cutting either the metals, the wood, the plastics, such as the plastic conduit or plastic pipes.

The Physics of the Tool (i.e. Type of Lever Etc.)

In this regard, the hacksaw belongs to the second class (class two) levers of tools. In the class two levers, the force is applied in one end, with the load in the middle, and finally the fulcrum in the furthest end. The hacksaw falls in such a category since the force is applied in the end with the handle and the load in the middle as seen by what it is being cut as the work is done.

Since the hacksaw operates in a linear sawing process, there are the characteristics of cutting motions which reciprocate both horizontally and perpendicularly to the surface of the workpiece that is being cut.

Measurements That Are Relevant to the Ergonomic Assessment

For the ergonomic assessment, there are the measurements of the hacksaw which have been standardized to enable the effective operations by the users, where there shall then be the comfortable working conditions, efficiency in the workplace, and finally, the optimal performance as the jobs are being well done. Such measurements are relevant for the ergonomic assessment. They are the diameter/width of 12.5 - 13 mm, a length of 300 - 305 mm, a material which is the silicon steel, a range of the number of teeth between 18 - 32, and a thickness of 0.025 - 0.65 m for a hack saw off the handsaws type. They have been tested and confirmed to be effective such that following their application in the design and production of the hacksaws for commercial use, as per their established ergonomic fitness.

All the Tissues (Ligaments, Tendons, Muscles, Nerves, Blood Vessels) That Are Involved in the Task-Discussed in the Hand Anatomy.

In the operations using the hacksaws, there are the tissues which get affected and are thus involved. They are located in the palm, fingers, and the wrist. There is the skeletal anatomy in the hand, which is made up of eight carpal bones. They form the wrist bones which are connected to the five metacarpal bones which form the palm part of the human hand. There are also the metacarpophalangeal joints that connect the metacarpal bone to the fingers and the thumps. It is also referred to as the knuckle joint.

There are also the bones in the fingers which get involved, referred to as the phalanges. They include the proximal and distal phalanges. There is also the interphalangeal joint in the human thumb that is involved in the operations using the hacksaw.

There is also the soft tissue anatomy in the hand anatomy. They hold the hands and the bones in place. They include the cartilage which is smooth and shiny and they allow the smooth movement where two bones get in contact with one another. Besides, the tendons which connect the muscle to the bones aid in the provision of support. Specifically, the extension tendons aid the fingers to get straight. The ligaments are the strong tissues which connect the bones to one another, an example of which is the volar plate.

Finally, there are the muscles which are the fibrous tissues which contract and enables the hand movement as the operations using the hacksaws continue.

There are also the nerves, including the radial, median, and ulnar nerves which transport any impulses between the hand and the brain. The blood vessels in the hand anatomy are the radial artery and the ulnar artery, which supply the blood flows to the hand anatomy.

Potential Disorders or Injuries-Discussed in the Hand Anatomy

There are the potential disorders or injuries which can afflict the hand following the use of the hacksaw. They include the proximal phalangeal fracture, hand stiffness, delayed union or non-union, open fracture, as well as the multiple fractures.

The Final Score From the Completed Checklist That You Downloaded Above and One Paragraph About the Results and Your Interpretation of the Score. Include the Filled Form (Image or Electronic) In the Report

In this case, the final score of the hacksaw as per the checklist for the assessment f the efficiency and ergonomic fitness of the non-powered hand tools is 93.7. the some did not reach the optimal score of 100 because of the presence f some discrepancies regarding the inefficiency of some parts of the equipment as per the checklist, which call for the implementation of some recommendations which will finally see as being optimally functional. The grip surface and the handle of the hacksaw is not optimally designed to serve the intended functions, hence not scoring all the points. Also, it has one handle hence scoring zero in question 10 concerning two-handed tools. it can be seen that the hacksaw is less than 2 ib and can comfortably be used with either of the hands, hence scoring well in questions 12 to 16 that has seen its performance rise to 93.7. it is thus fairly efficient.

Discussion of the Recommended Changes in the Context of Musculoskeletal Injuries.

There are some of the changes recommended for the hacksaw in the context of the musculoskeletal injuries one of them is the inclusion of a thicker grip surface to avoid skeletal strain and the subsequent likelihood of stiffness. Also, the grip surface should be made more absorbed to sweat to avoid the hand slip and strain. Finally, the tool should be made lighter for eased working, hence reducing the hand strain.

A picture of the tool by itself and when is being used for a variety of its functional application-10% bonus mark when you are in the pictures and demonstrating all the conditions that the tool is possibly used!

In a given workplace, there is a way in which the metabolic rate can be estimated. It can be understood that the hint for the estimation of the dynamic work in a given workplace is determined by the aerobic capacity as seen in the stakeholder who is list fit in such a setting. They determine the generalized level of metabolic rates, such that the ergonomic fit of the employees in their working environments can comfortably be gauged. It has been established that the fifth percentile for the demands of the whole body lies in a region of 21 ml/kg/min. there have also been the developments where a standardized value for a given percentile is termed as a criterion fit for the estimation of the aerobic capacity and hence the metabolic rate in a given workplace. It is the value of 27 ml/kg/min which is measured at a region of the 25th percentile. It is a good criterion. According to the standardized ergonomics design, there has been the classification of the values for the estimation of the metabolic rate in relation to the part of the body which is involved in the work in the task area assigned. It can thus be observed that in the event the upper part of the body which can include the shoulders and the arms are involved in the performance of the tasks, then the primary performance of the job task in the working environment, then the criterion used on the estimation of the metabolic rate is the value of 19 ml/kg/min. it is because such body parts are not much involved in the consumption of a substantial amount of oxygen unlike the lower parts of the body. They consume the lower oxygen capacities hence the lowered value of the estimation of the metabolic rate in the long run. For the case of the percent maximum aerobic capacity, it covers the ratio of the oxygen demand in the place of work, which in this case measures the dynamic work as well as the criterion dynamic capacity.

There is also a factor of the endurance time which aids in the estimation of the metabolic rate. An example of its use can be seen in an example whereby if a certain work demands 15 ml/kg/min the percent maximum aerobic capacity will be 56 with the associated endurance time being 1 hour. However, in the event the required work becomes much more than the stated value, there are some considerations which should then be given which will aid in the lowering of the dynamic demands of the work.

As the metabolic rate is being estimated, there is the time-weighted average covering the metabolic demands which have been established as should not be exceeding the value of 33%, 30%, as well as 25% in the shift lengths of 8, 10, and 12 hours. Since there are the shorter time intervals, the evaluator of the metabolic rates should regard any work cycles and pose if the average metabolic demand which is expressed in the form of the percentage maximum aerobic ratio in regard to the criterion aerobic capacity which exceeds the recommended average.

Conclusion

Finally, regarding the analysis of the static work, the work in the job environment can get to be described in terms of the relative effort which is expressed as a percentage maximum aerobic ratio based on the existing average demand as opposed to the cycle of the effort time as well as the recovery time which is allowed in the cycle. In the event the time-weighted average is more than 30% in the 8-hour shift, the demands can then be high enough to induce tiredness in the workplace.

Further, as the metabolic rate is being estimated, the dynamic work in the job environment can get to be measured using the metabolic energy rate of expenditure as well as the consumption of oxygen in the process. There is also the use of the estimation of the workload which aids in the quantification of the physical effort levels of various jobs at hand, in the run to evaluate the demands of all the jobs. There can then be the stressing of the physical effort through the assessment of the identified primary as well as the supplementary requirements of the job. The primary activities measure the degree of effort and categorize them into light, moderate, and heavy tasks. The supplementary activities cover on the effort of an individual in doing such activities as standing/walking, restrained posture, fixed external pace, visual or auditory requirements most of the time, and use of small muscle groups of 1.8 or 4 pounds. Finally, the residual activities concern other physical activities such as the paid lunch, breaks, waiting, or even basal activities. Such an evaluation of the metabolic rates will, in the end, find the intensity of the concerned task through the choice of the effort level in a...