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Mean of SN ratios 50.5 50.0 49.5 49.0 50.5 50.0 49.5 49.0 Fig. 4.5 Main Effects for SN Ratios Table 4.5 ANOVA: Experimental set 1 Source DF SS MS F P Style 1 25878.1250 25878.1250 7.604 0.110 Speed 2 6806.2500 3403.1250 0.829 0.500 Curvature 4 16412.5000 4103.1250 Total 7 49096.8750 1 Flat Curvature Style Signal-to-noise: Larger is better Main Effects Plot for SN ratios Data Means 2 Curved Overall, the results are interesting and contradicting also in some cases from one set of experiments to the other. For example, in set 1, the most significant factor is the curvature at above 90% confidence level. Whereas, the deposition style came out to be insignificant. The second set of experiments with more curing time, however, gave the style of deposition as the most significant factor, at above 95% confidence 2 Speed 4 100
level. The other parameters were insignificant. A closer examination of the strength values obtained in experimental set 1 reveal that the curved layer parts are always of higher strengths compared to their flat layered counter parts, except in one case. This was mostly reversed in the case of experimental set 2. The probable reason for this is the typical nature of the epoxy used in the investigation It was observed that the epoxy remains as a semisolid with considerable amount of fluidity for a considerable length of time, as no external heating is used. This resulted in a thorough fusing of the material across adjacent roads and also due to self weight, across different layers. A gross distortion of the shape in the vertical direction also was observed and the net result was a thoroughly fused flat layered part, which when given with sufficient time such as the two week curing time as in the case of the second set of experiments, resulted in stronger parts. However, this much of inter layer fusing might not happen in the case of normal FDM, due to the short duration of sintering of the polymer across roads or layers. In such a case, curved layer FDM is likely to give better strength to parts, as against flat layers, as is evident from the first experimental set. However, these results are only indicative, and a more comprehensive investigation using regular FDM materials and a more reliable experimental setup is essential to establish the true significance of curved layer FDM. 101
Page 1 and 2:
An Investigation into curved layer
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Contents Abstract..................
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3.5.2 Fabepoxy.....................
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methodology to print simple curved
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List of Figures 1.1 The Rapid proto
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4.3 Parts being tested with Hounsfi
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List of Abbreviations 3D: Three dim
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Fig 1.1 The Rapid prototyping Cycle
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1.1.1 Stereolithography Stereolitho
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The object to be made is first mode
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1.1.5 Laser Engineered Net Shaping
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1.2 Fused Deposition Modeling A det
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Fig 1.8 Deposition Head Different t
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900mc is capable of producing parts
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noted that the parts built in this
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structure. Honeycomb scaffold archi
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optimal direction to build a part t
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processing treatment was analyzed w
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The actual influence of the curved
Page 39 and 40:
Separating the Main part with its s
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limited to simple models. It could
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Fig 2.2 Faces, Edges and Vertices o
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2.1.5 Constructive Solid Geometry C
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A STL file is a triangular represen
Page 49 and 50: Fig 2.8 A sample Binary STL File Sl
Page 51 and 52: Different processes may either vary
Page 53 and 54: At the very outset of generating th
Page 55 and 56: and correction of each point to sat
Page 57 and 58: apid prototyping machine are remove
Page 59 and 60: Fig 2.13 Main Part Fig 2.14 Support
Page 61 and 62: As this text file is to be used wit
Page 63 and 64: mounted to the axes carriage. Timin
Page 65 and 66: Fig 3.1 The deposition head At the
Page 67 and 68: 3.2.3 Assembling Electronics and ca
Page 69 and 70: microcontroller is now disconnected
Page 71 and 72: The relationship between test point
Page 73 and 74: on the mechanical properties and po
Page 75 and 76: 3.5.1 Silicone with other materials
Page 77 and 78: Fab@home machine. Since our require
Page 79 and 80: are printed using the two suitable
Page 81 and 82: The support structure‟s dimension
Page 83 and 84: machine Fig 3.13 Flat and curved la
Page 85 and 86: 4.1 Experimental conditions Chapter
Page 87 and 88: have many factors from contention a
Page 89 and 90: 4.3 Taguchi methods There are two t
Page 91 and 92: Such steps usually identify the nee
Page 93 and 94: Nominal is best Larger is better S
Page 95 and 96: Control of material flow - The lead
Page 97 and 98: Fig 4.3 Parts being tested with Hou
Page 99: values in all cases are almost doub
Page 103 and 104: The finite element method has had a
Page 105 and 106: performance of finished FDM parts [
Page 107 and 108: ehaviour with failure occurring at
Page 109 and 110: Fig. 2 (a) is the thin curved part
Page 111 and 112: Table 5.1 Property data: Fabepoxy M
Page 113 and 114: optimum number. The final finite el
Page 115 and 116: Fig. 5.11 Load and boundary conditi
Page 117 and 118: overall deflection pattern of two s
Page 119 and 120: Fig. 5.13 Variation of compressive
Page 121 and 122: Fig. 5.15 shows the overall deforma
Page 123 and 124: The effectiveness of the deposition
Page 125 and 126: [11] M. Greul, T. Pintat, M. Greuli
Page 127 and 128: [32] Philip J. Ross, 1988, “Taguc
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