<p>The open-loop educational computer numerical control (CNC) milling machine requires accuracy verification in order to ensure its accuracy and functionality. In this paper, the new verification method is proposed based on the length measurement using the fringe counting of He-Ne laser interferometry. The ideal translation length is defined by the number of electric pulses generated by the micro-stepping driver, while the actual length is measured using He-Ne laser interferometry. In the experimental process, the data of the fringe pattern of the He-Ne laser and the number of electric pulses which drive the stepper motors were simultaneously acquired using an oscilloscope. Hence, the data has been analyzed to obtain the ideal and actual lengths by using an in-house program developed in Python. By comparing the actual translation and ideal length, the accuracy of the educational CNC milling machine has been evaluated to be 50 µm for the length up to 200 mm.</p>
To improve agricultural and plantation yields, farmers need fertilizer. Currently the problems faced by farmers in Tancep Village Ngawen District Gunungkidul Regency is the scarcity and high price of fertilizer. On the other hand, the area has great potential, in the form of availability of organic materials and animal manure that can be utilized as fertilizer. In this community service the knowledge and simple technology to process waste and other organic materials into compost were given. The process of making compost requires the process of chopping garbage or organic materials, such as wet leaves and twigs, so that the pieces are small. For that in this activity needs to be done making garbage chopper machine or organic materials. An organic waste counter machine is made with a rotary blade construction consisting of 12 blades. The construction of a machine is made portable with a propulsion in the form of a gasoline engine, so the machine is easily moved and operated indoors or outdoors. Through community service activities in Tancep Village, Ngawen Subdistrict, Gunungkidul Regency has formed a garbage bank managed by Karang Taruna group. In addition to collecting and reselling of inorganic waste, the activity developed is processing organic waste into compost. Through the knowledge and equipment owned, it is expected that the compost fertilizer produced can help meet the needs of fertilizer for local farmers to self-help fertilizer.
The usage of computerised numerical control (CNC) machines requires accuracy verification to ensure the high accuracy of the processed products. This paper introduces an accuracy verification method of an open-loop CNC milling machine using a fringe counting of He–Ne laser interferometry to evaluate the best possible accuracy and functionality. The linear motion accuracy of open-loop CNC milling was evaluated based on the number of pulses from the controller against the actual displacement measured by the He–Ne fringe-counting method. Interval distances between two pulses are also precisely measured using the He–Ne interferometry. The linear motion error and controller error can be simultaneously evaluated in sub-micro accuracy. The linear positioning error due to the micro-stepping driver accuracy of the mini-CNC milling machine was measured with the expanded uncertainty of measurement and was estimated at 240 nm. The experimental results show that linear motion error of the open-loop CNC milling can reach up to 50 μm for 200 mm translation length.
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