The Particle Swarm Optimization (PSO) method is one of the methods used for multirespon optimization in the manufacturing process. In this research, the material used is Glass fiber reinforced polymer (GFRP) composite material which is stacked with stainless steel material. The machining process used is a drilling process conducted on a vertical CNC machine Brother TC-22A-O. The thrust force and torque is the response used to evaluate the performance of the drilling process. The quality characteristics of this response "the smaller the better". The aim of this study was to identify the combination of process parameters to achieve the performance characteristics required in drilling process the GFRP-SS material using Particle Swarm Optimization methode (PSO). The three process parameters i.e. point angle, spindle speed, and feeding speed is used as a process parameter. Point angle was set at two different levels, while the other two were set at three different levels. Therefore, the 2 x 3 x 3 factorial is used as the experimental design. The experiments were replicated two times. The minimum thrust force and torque could be obtained by using point angle, spindle speed, and feeding speed are 118o, 2330 rpm, and 65 mm/minrespectively.

The development of industrial in the utilization of composites as a substitute of metal materials that are used is fiberglass. However, fiberglass is considered not environmentally friendly because difficult to decipher. The technology advances, it is now widely used from composite materials with natural fibers.This research was conducted to obtain data about mechanical ability in the tensile strength, impact strength and physical form of Gaharu skin fibers using polyester matrix BQTN 157 with volume fraction variations made by hand lay-up method. This research is expected to be useful in automotive, manufacturing industry and household appliances are environmentally friendly. The maximum value of tensile strength is 34.574 MPa in 45% fiber volume fraction. However, there is a decrease in the tensile strength value in the 50% fiber volume fraction, which is 22,635 MPa, this is due to the large amount of fiber content so that the matrix spread to the fiber is uneven. The maximum impact strength value is 62.76 kJ / m2 at 50% fiber volume percentage. Based on the results of testing the comparison of the fiber and matrix volume fractions greatly affect the tensile strength and impact. The results show tensile and impact tests have met the plastic standards used car dashboards.

Recent days, more and more people are becoming interested in "free-energy". "Free-energy" means the energy sources used freely without to pay. The sources of "free-energy" are sunlight, rainfall, wind energy, wave power, and tidal power. There are other sources of power such as gravity, electrical charge in the atmosphere and ionosphere, and a mass. FESS (Flywheel Energy Storage System) is an attempt to store kinetic energy generated from the rotation flywheel in which the electrical power output from the generator as an input to the motor. Mass flywheel greatly affects the amount of power generated by a generator which will serve as a flywheel device or distributors of energy while at the induction generator to eventually convert mechanical energy into electrical energy and vice versa. In this system design becomes very important for the flywheel can store the kinetic energy. This research aims to design and build mechanisms as a means of comparison FESS flywheel effect of the geometry of the kinetic energy generated. The research method is done by making three different geometric design flywheels, and then analyzed with the help of FESS. From the experimental results, flywheel 1 with a ringtype web-concave generate kinetic energy of 312.30 J and specific energy of 31.23 J / kg, at the flywheel 2 which is type-straight arm kinetic energy gained by 316.73 J and energy specific of 31.67 J / kg and flywheel 3 with a ring-type web-straight kinetic energy obtained by 284.997 J and specific energy of 28.49 J / kg. From the research data we can conclude that each design geometry flywheel has a different contribution to the performance of energy storage.

The industry manufacture with high quality and able to pruduce the workpicece with high quality In industry manufacture are very necessary. The use of high quality machines should be supported by the ability to operate and the ability to perform maintenance, this ability is useful to maintain the condition of the machine in order to produce good quality workpieces. Politeknik Manufaktur Negeri Bangka Belitung has several high quality machine tools, one type of machine tools usually use is lathe machine doall LT13 with total have six units. this machine Used to support education and to produce spare parts. Doall LT13 lathes have been used for 22 years, during that period there may be deviation of machine geometry, deviations that occur can lead to decreased quality of the resulting workpiece. This study aims to determine the feasibility of the machine by measuring the roundness of the spicemen of the process of turning, the roundness of the specimen is analyzed by using the minimum circle method. From the roundness testing performed on the doall lt 13 the result� that can be achieved as follows 0,082 mm at lathe number 8, 0,073 mm at lathe number 5, 0,057 mm at lathe number 7, 0,051 mm at lathe� number 2, 0,048 mm at lathe number 6 and 0,046 mm at lathe number 3.

Increasing consumption of young coconuts (known as "Kelamud") is leading to a rise in the amount of waste generated by these coconuts. A group is using this waste as a raw material for the production of compost fertilizer for oil palm trees. However, the process is still performed manually by chopping waste with a machete of 15-20 mm thickness, which takes a considerable amount of time. This research aims to design and construct a machine for vertically chopping coconut waste. The proposed research method is a synthesis strategy that combines design concepts with the steps of clarifying and translating the client's desires. Then, these desires are incorporated into the machine design procedure by making selections, analyzing the interdependence and interrelationships between the selections, assessing trade-offs, and evaluating the outcomes of these selections. The final design of the Kelamud chopper machine consists of a motor with a 5.5 horsepower gasoline engine, a chopping system with a four-blade knife system, and a transmission system with pulleys and belts. Based on the results of the tests, the machine is capable of chopping waste from young coconuts with a capacity of 232.62 kg/hour in fibrous properties.