Salt Lake City, Utah
June 23, 2018
June 23, 2018
July 27, 2018
Computer numerical control is a very broad term that encompasses a variety of types of machines — all with different sizes, shapes, and functions. But the easiest way to think about CNC is to simply understand that it is all about using a computer as a means to control a machine that carves useful objects from solid blocks of material. Traditional CNC machines are expensive, complicated, and typically only found in large manufacturing companies that can afford them. Small hobbyist CNC machines can run anywhere from $7,000 and higher; professional machines can cost millions of dollars! Now, for a fraction of the cost — under $800 one can own a Mini 3-axis CNC machine and cut, drill, mill, and carve objects of one's imagination.
In this paper, a Mini 3-axis CNC router was assembled and tested. Simple shapes of circles and squares were cut on two different materials: plastic and wood. Diameter of the circles and side of squares were measured using a digital caliper. Data were collected for a 2k factorial design experiments considering 2-levels for parameters: spindle speed, feed rate, cut depth, material, and object shape. Statistical analyses using Minitab and/or Microsoft Excel were performed on the collected data. Effects of chosen parameters on the dimensional accuracy of the parts made were analyzed. The results indicated that cut depth, material, and object shape have significant effects on the dimensional accuracy of the parts made. Through this hands-on project, the students were trained in assembling and testing a CNC router, cutting simple to complex shapes using G-Codes, measuring the parts made for dimensional accuracy, collecting data for experimental design, and analyzing the data using Minitab and Microsoft Excel. Some of the difficulties encountered in assembling and testing the CNC router and the learning experience from the student team are also presented and discussed.
Radharamanan, R. (2018, June), Measurement and Analysis of Carved Surfaces Made on a Self-Assembled and Tested Mini 3-Axis CNC Router Paper presented at 2018 ASEE Annual Conference & Exposition , Salt Lake City, Utah. https://peer.asee.org/30792
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