Production process in vehicle exhaust small industry releases waste water from xhaust tube electroplating and anodizing without any pre-treatment. It contains plating and coloring from Chroom hexavalent as much as 65,586 mg/l and lead 86,576 mg/l, which is more that the electroplated and anodized waste water quality limit of and 0,3 mg/l 0.1 mg/l for Lead concentration. In addition Chroom and Lead is categorized as toxic and dangerous waste substances. This research is aimed at studying the fundamental characteristics of Chroom and Lead separated from electroplated waste water in exhaust tube by means of electro-Coagulation. To get a comprehensive understanding of process characteristics, two intrinsic parameters are the focus of this research. This include electro-chemistry (installed voltage and current gain) and psycho-chemistry-fluid (process time and contaminant concentration). The research method involved designing assembly and fabrication of an electro-coagulation unit in the laboratory scale. It also a characteristic study of separation process by varying both electrochemistry and psycho-chemistry-fluid parameters, whilst developing a characteristic model of Chroom and lead separation. Those research stages provided measured contributions that resulted in a prototype of a compact and modular electrocoagulation device. This was designed with 5 pairs of aluminum electrodes that capable of separating chroom and lead with a gain of 88,76% and 87.54%.

Transmission ratio change in today’s motor cycle rubber belt Continuously Variable Transmission (CVT) are based on centrifugal forces resulted from engine revolution. Compare to manual transmission, this kind of CVT needs higher engine revolution to start engaging the transmision ratio which in turn requiring more fuel consumption. A transmission ratio change concept based on an Electro-mechanical actuator consisting of cam, actuator gears and DC motor has been developed to eliminate the dependancy of transmission ratio on engine revolution. The DC motor rotates the cam through actuator gears. The rotation of the cam causes the primary movable pulley sheave to move in axial direction, which in turn changing the belt-pulley pitch radius and changing the transmission ratio. This research aims to design and implement an electronic measurement system based on Arduino Uno as a data acquisition system and Matlab/Simulink as a controller program to obtain the measurement data of primary pulley and secondary pulley speeds and primary pulley axial position. Based on these data, the transmission ratio can be determined and the relationship between transmission ratio and primary pulley posistion can then be obtained. For future development, these measurement data will be used as important references when developing and testing the transmission ratio controller programs.

This paper introduces an electro-mechanical transmission ratio shifter of rubber belt continuously variable transmission (CVT). The CVT basic system consists of primary pulley (input), secondary pulley (output) and a rubber belt. This belt connects the primary pulley to the secondary pulley and tranfers the speed and torque from the input to output by means of belt-pulley contact friction. Each pulley set has one fixed and one sliding pulley sheaves. The axial movement of primary sliding pulley sheave is actuated by an electro-mechanical system consisting of the DC servomotor, actuator gears and cam mechanism, while the secondary sliding pulley sheave is constantly pushed by contra spring to mantain the overall belt tension and to prevent belt slip. By controlling the DC motor revolution, the axial position of the primary sliding pulley sheave can be adjusted to vary the primary belt-pulley contact radius, which in turn mechanically changing the secondary belt-pulley contact radius and finally changing the transmission ratio. The relationship between motor revolution, primary belt-pulley contact radius, secondary belt-pulley contact radius and transmission ratio can be determined based on mathematical equations of variator geometry, the total gear ratio of the actuator gears and cam mechanism

Good ride performance is one of the most important key attribute of a passenger vehicle. One of the methods to achieve this is by using continuously variable transmission (CVT). This is because a CVT has the capability of providing an almost infinite ratio within its limits smoothly and continuously. Motor with automatic transmission known as motor matic is now become widely used as main transportation. Easy to drive is the main reason to choose this type motor cycle. The mechanism of pulley axially movement controller based on centrifugal concept where the ratio of pulley totally depend on speed rotation of input shaft which is in line with the engine shaft. The effect of this system is there is no engine break during decline road condition. So that actually this motor cycle is not suitable for road with extreme decline condition. The purpose of the research is to design mechanism where the pulley movement can be controlled by the driver with the aid of electromechanical system. The design electromechanical of Single Acting Pulley Actuator (EmSAPA) Continuously Variable Transmission (CVT) utilizes combinations of DC motor system, gear reducers and power cam mechanisms to actuate primary movable pulley sheaves on the transmission shaft. The secondary pulley supported by spring provides a belt clamping force to prevent slips, while the secondary controls the rubber v-belt from slipping. This paper is also present comparison on mechanical linkage system which will actuate pulley to move axially.

Purbalingga Regency Government policy to include exhaust pipe as one of the region's leading commodities is considered as one finest step. Various types of motor vehicle are produced and as a result small industry engaged in motor vehicle spare parts are emerging, including exhaust parts. The choice of technology with the metal industry, especially the exhaust in Purbalingga aims to improve the competitiveness of regional superior competency-based industries, namely revitalizing the industrial sector in order to exist and be able to develop, and be able to transfer technology about improving exhaust quality which has an impact on increasing the exhaust industry's income. The exhaust products from SMEs have exclusivity in the tip of exhaust pipe that is coated with metal, thus improve the appearance and quality of the exhaust. But the exhaust product with a variety of metal coated parts turned out to be incompatible with industry standards, which consequently the quality of the results of the dull metal coating process, easy to peel and rusty. For this reason, Semarang State Polytechnic implements rectifier equipment for metal coating. The methods used were the founding of an Institution Forum for the Purbalingga Exhaust Cluster Association, metal coating technique training for workers, operating tests, operational procedures and operational assistance. The results obtained are rectifiers for metal coating with current outputs of 10 A, 20 A, 30 A, 40 A, 50 A.