PRODUCTIVITY ANALYSIS OF ERGONOMIC CHAIR FOR OPERATOR POND MACHINE

There is a previous study analyzing the design of ergonomic chairs for pond machine operators, where the analysis uses the RULA method manually, Based on the results of data processing with the RULA method, it can be concluded that the posture of the ring making operator (washer) operator with a slightly bent body position has a score value 5, and the chair design based on the redesign of the pond engine operator chair shows that the final result is 3. (Mukhtar, 2018) In this study, a productivity analysis is carried out to measure the level of chair productivity by considering several aspects of work activities, The method used is the Objective Matrix (OMAX) and the determination of the score from the performance appraisal using the Analytical Hierarchy Process (AHP) method. The results obtained are Productivity increased from before, because it is still in the range of 3-10 (based on the matrix table the score 3-5 is good enough, 6-8 good and 9-10 very good) and the lowest values shown in this table are 3 and 4 Based on the scores, the scores are still quite good. But there still must be improvement. Overall the level of productivity has increased compared to before. But there are still fluctuating data. This is due to the lack of uniformity in the ability of the opeator to run the pond engine in washer production. Keyword :Productivity, Ergonomics Chair, Pond Machine


INTRODUCTION
Every industry, both large and small, wants to maintain its business to survive in the face of competitive competition, companies must improve internally, one of them is by increasing productivity. Because this will make the company grow. Productivity is a picture of the company's achievements (Agustin & Riana, 2011) which is able to provide an overview of the relationship of output and input used to produce output (Zanuar, 2014).
The obstacle of the company in increasing productivity on the production floor is generally influenced by the inappropriate use of resources during production activities. For this reason, productivity measurements are needed on the production floor (Avianda et al., 2014). By measuring this productivity the company is able to find out the level of productivity that has been achieved and can be used as a foundation for the company's future planning (Zanuar, 2014). So, companies can evaluate the factors that affect changes in productivity of the company (Pangaula et al., 2015) This increase in productivity is closely related to efforts to improve the level of a country's economy and to strengthen Indonesia's position in increasingly fierce world trade competition. On a company scale, it is hoped that there will be efforts to increase productivity, which in turn can support national productivity Productivity measurement is done by taking into account the condition of the company, so that the size obtained is able to provide a clear picture of the level of productivity of the company (Zanuar, 2014). The inefficient and effective use of raw material, labor, energy, and machine resources during production activities encourages companies to increase productivity. Therefore companies need to take productivity measurements to find out the dominant factors that influence productivity.
In previous studies analyzing the design of ergonomic chairs for pond machine operators, where the analysis using the RULA method manually, Based on the results of data processing with the RULA method, it can be concluded that the posture of the ring making operator (washer) operator with a slightly bent body position has a score value 5, and the chair design based on the redesign of the pond engine operator chair shows that the final result is 3. (Mukhtar, 2018) The purpose of this research is to measure the level of productivity of the design of ergonomic chair designs used by pond machine operators. Considering the important role of the production process activities carried out by pond machine workers in the metal industry, where labor plays a dominant role, it should be done study to analyze and evaluate work postures.
In this research, productivity analysis was carried out to measure the level of chair productivity by considering several aspects of work activities, the method used was Objective Matrix (OMAX). The productivity measurement method used is the Objective Matrix (OMAX) method and for determining the score of the performance appraisal using the Analytical Hierarchy Process (AHP) method. In this method provides an overview of the state of company productivity. Raw material is one of the important components of input which acts as a basic material in washer production. And also labor is one of the input components that acts as the manager of the management system and with the machine runs the production process.
Based on these problems, it is necessary to measure how effective and efficient the washer component production process uses an ergonomic chair for the pond machine operator.

METOD
Data processing using the method developed by James L. Riggs has the following stages (Riggs, 1986 referred to in the Balkans, 2010): a. Determine measurement objectives b. Determine measurement criteria c. Determine the performance ratio Performance is the level of productivity which is the ratio of each measurement criterion. Performance value is obtained by dividing the ratio of inputs with outputs on each criterion. d. Determine the target (Faridz et al., 2010).
Determine the Final Target Target (Score 10) The value of the score of 10 is obtained from the BKA (Upper Control Limit) which is the maximum productivity limit that the company might achieve from each productivity criterion. Determining Short-Term Goals (Score 3) The value on the score 3 is the value of productivity that has been achieved so far. The score on score 3 is obtained by averaging the radio values for each criterion. The formula to calculate the average is: : The average of each criterion measured for 3 months n: amount of data Xi: The ratio of each criterion Determine the Lowest Productivity Value (Score 0) The value on the score 0 is obtained from the BKB (Lower Control Limit) which is the minimum productivity limit that may be achieved by the company. The BKB formula is: B A = -k. ... ......... (5) Determine realistic productivity values (Score 1-2 and Score 4-9) Realistic productivity values are values that might be achieved before the final goal. Scores 1-2 and scores 4-9 are obtained from interpolation. The interpolation formula used is (Balkan, 2010): Determining the value of criteria weights Determining the weight of each criterion is emphasized in determining the priority value of criteria by comparing which is more important between criteria. To make it

RESULT a. Determine research objectives
The purpose of this study was to determine the level of productivity of workers / operators of pond machines before and after using ergonomic chairs using the OMAX method.

b. Establish Criteria
The criteria to be measured are 4 criteria: 1) Criteria 1 is the amount of material used per hour.
2) Criteria 2 is the number of defective rings 3) Criteria 3 is the amount of operator productive time These three criteria are the input in this study and the output is the amount of ring / washer production without defects. The data is obtained from historical data of the engine operator when using ergonomic chairs in July 2019 -September 2019. Input and output data can be seen in Table 2. Performance values can be seen in the following.  3) Target sasaranTerburuk (Skor 0) Criteria of material used σ = 5.08 ; μ = 31.33 LCL= UCL= μ -k . σ (k= 2. Beacause CL lies on 68% < CL ≤ 95%.) LCL= UCL= μ -k . σ = 31.33 -(2 x 5.08) = 21. 15 So as to find out all the worst targets in each input criteria used, it can be seen in the following table 5.  Based on the results of weighting in table 4.6 the next step is to determine the weighting that ranges from 0-1 and the total weight of each column is 1. The weight calculation is by dividing the numbers in each cell by adding all the numbers in one column. For example cell 1 = 1 / (1 + 2 + 7) = 0.1.    Based on the analysis of data retrieval that has been processed using the OMAX method, the following data are obtained for the productivity of the pond engine operator after using an ergonomic chair.     Based on the analysis of data retrieval that has been processed using the OMAX method, the following data are obtained for the productivity of the pond engine operator after using an ergonomic chair.    Based on the analysis of data retrieval that has been processed using the OMAX method, the following data are obtained for the productivity of the pond engine operator after using an ergonomic chair.

CONCLUSION
Productivity increased from before, because it is still in the range of 3-10 (based on the matrix table the scores are quite good 3-5, 6-8 good and 9-10 very good) and the lowest values shown in this table are 3 and 4. Based on the score scores it is still quite good. But there still must be improvement. A value of 3 is obtained for operator G for the defective ring / washer criterion and for operator B for the Earning Time criteria. Whereas the score 4 is obtained from the E operator on the used material criteria and on the B operator on the defective ring / washer criteria. Overall the level of productivity has increased compared to before. But there are still fluctuating data. This is due to the lack of uniformity in the ability of the opeator to run the pond engine in washer production.

INTRODUCTION
Every industry, both large and small, wants to maintain its business to survive in the face of competitive competition, companies must improve internally, one of them is by increasing productivity. Because this will make the company grow. Productivity is a picture of the company's achievements (Agustin & Riana, 2011) which is able to provide an overview of the relationship of output and input used to produce output (Zanuar, 2014).
The obstacle of the company in increasing productivity on the production floor is generally influenced by the inappropriate use of resources during production activities. For this reason, productivity measurements are needed on the production floor (Avianda et al., 2014). By measuring this productivity the company is able to find out the level of productivity that has been achieved and can be used as a foundation for the company's future planning (Zanuar, 2014). So, companies can evaluate the factors that affect changes in productivity of the company (Pangaula et al., 2015) This increase in productivity is closely related to efforts to improve the level of a country's economy and to strengthen Indonesia's position in increasingly fierce world trade competition. On a company scale, it is hoped that there will be efforts to increase productivity, which in turn can support national productivity Productivity measurement is done by taking into account the condition of the company, so that the size obtained is able to provide a clear picture of the level of productivity of the company (Zanuar, 2014). The inefficient and effective use of raw material, labor, energy, and machine resources during production activities encourages companies to increase productivity. Therefore companies need to take productivity measurements to find out the dominant factors that influence productivity.
In previous studies analyzing the design of ergonomic chairs for pond machine operators, where the analysis using the RULA method manually, Based on the results of data processing with the RULA method, it can be concluded that the posture of the ring making operator (washer) operator with a slightly bent body position has a score value 5, and the The purpose of this research is to measure the level of productivity of the design of ergonomic chair designs used by pond machine operators. Considering the important role of the production process activities carried out by pond machine workers in the metal industry, where labor plays a dominant role, it should be done study to analyze and evaluate work postures.
In this research, productivity analysis was carried out to measure the level of chair productivity by considering several aspects of work activities, the method used was Objective Matrix (OMAX). The productivity measurement method used is the Objective Matrix (OMAX) method and for determining the score of the performance appraisal using the Analytical Hierarchy Process (AHP) method. In this method provides an overview of the state of company productivity. Raw material is one of the important components of input which acts as a basic material in washer production. And also labor is one of the input components that acts as the manager of the management system and with the machine runs the production process.
Based on these problems, it is necessary to measure how effective and efficient the washer component production process uses an ergonomic chair for the pond machine operator.

METOD
Data processing using the method developed by James L. Riggs has the following stages (Riggs, 1986 referred to in the Balkans, 2010): a. Determine measurement objectives b. Determine measurement criteria c. Determine the performance ratio Performance is the level of productivity which is the ratio of each measurement criterion. Performance value is obtained by dividing the ratio of inputs with outputs on each criterion. d. Determine the target (Faridz et al., 2010).
Determine the Final Target Target (Score 10) The value of the score of 10 is obtained from the BKA (Upper Control Limit) which is the maximum productivity limit that Determining Short-Term Goals (Score 3) The value on the score 3 is the value of productivity that has been achieved so far. The score on score 3 is obtained by averaging the radio values for each criterion. The formula to calculate the average is: μ = 1 / (n∑_ (i = 1) ^ n▒Xi) ... ... ... ... (4) Information : : The average of each criterion measured for 3 months n: amount of data Xi: The ratio of each criterion Determine the Lowest Productivity Value (Score 0) The value on the score 0 is obtained from the BKB (Lower Control Limit) which is the minimum productivity limit that may be achieved by the company. The BKB formula is: B A = -k. ... ......... (5) Determine realistic productivity values (Score 1-2 and Score 4-9) Realistic productivity values are values that might be achieved before the final goal. Scores 1-2 and scores 4-9 are obtained from interpolation. The interpolation formula used is (Balkan, 2010): Determining the value of criteria weights Determining the weight of each criterion is emphasized in determining the priority value of criteria by comparing which is more important between criteria. To make it

RESULT a. Determine research objectives
The purpose of this study was to determine the level of productivity of workers / operators of pond machines before and after using ergonomic chairs using the OMAX method.

b. Establish Criteria
The criteria to be measured are 4 criteria: 1) Criteria 1 is the amount of material used per hour.
2) Criteria 2 is the number of defective rings 3) Criteria 3 is the amount of operator productive time These three criteria are the input in this study and the output is the amount of ring / washer production without defects. The data is obtained from historical data of the engine operator when using ergonomic chairs in July 2019 -September 2019. Input and output data can be seen in Table 2.   So as to find out all the worst targets in each input criteria used, it can be seen in the following table 5.  Based on the results of weighting in table 4.6 the next step is to determine the weighting that ranges from 0-1 and the total weight of each column is 1. The weight calculation is by dividing the numbers in each cell by adding all the numbers in one column. For example cell 1 = 1 / (1 + 2 + 7) = 0.1.    Based on the analysis of data retrieval that has been processed using the OMAX method, the following data are obtained for the productivity of the pond engine operator after using an ergonomic chair.     Based on the analysis of data retrieval that has been processed using the OMAX method, the following data are obtained for the productivity of the pond engine operator after using an ergonomic chair.    Based on the analysis of data retrieval that has been processed using the OMAX method, the following data are obtained for the productivity of the pond engine operator after using an ergonomic chair.  Based on the above table, in general it can be concluded that productivity increased from before, because it is still in the range of 3-10 (based on the matrix table the score 3-5 is good enough, 6-8 good and 9-10 very good) and the lowest value is shown in these tables are 3 and 4. Based on the scores the scores are still quite good. But there still must be improvement. A value of 3 is obtained for operator G for the defective ring / washer criterion and for operator B for the Earning Time criteria. A set of 4 scores was obtained from operator E on the material used criteria and on operator B on the defective ring / washer criterion.

CONCLUSION
Productivity increased from before, because it is still in the range of 3-10 (based on the matrix table the scores are quite good 3-5, 6-8 good and 9-10 very good) and the lowest values shown in this table are 3 and 4. Based on the score scores it is still quite good. But there still must be improvement. A value of 3 is obtained for operator G for the defective ring / washer criterion and for operator B for the Earning Time criteria. Whereas the score 4 is obtained from the E operator on the used material criteria and on the B operator on the defective ring / washer criteria. Overall the level of productivity has increased compared to before. But there are still fluctuating data. This is due to the lack of uniformity in the ability of the opeator to run the pond engine in washer production.