8 research outputs found
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Measurement Systems Comparison on Various Feature Sizes of FDM Parts
12 identical FDM parts were produced in ABSM30, each having 16 features for replicated
measurements. Half the features were positive (posts), half were negative (holes). Half of all
features were rectangular, half were round. Two different CMMs with 1.5mm touch probes were
compared, one CMM additionally used a laser, and manual measurements were taken with
gauges and calipers. All features were measured using these 4 measurement systems. All
measurements were compared against the theoretical feature size to generate a percent error
value. The laser values were notably different than both probe values. The manual
measurements were similar to one of the two CMM probes. Positive versus negative features
were significantly different in 7 of 8 cases. Feature size and measurement error were inversely
proportional. The largest features had the least amount of error in all cases while the features
below 6mm had the most error and high variation.Mechanical Engineerin
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3D Printing Thin Skinned Composites to Achieve the Strength-to-Weight Ratio of Aluminum
Kevlar and stainless steel mesh reinforcements were added using epoxy to 3D printed ABS-M30
thin skins, thereby making a composite structure with significantly improved mechanical
properties over that of the 3D printed plastic alone. These additive manufactured composites
have a strength to weight ratio that is comparable to solid aluminum. Flexural 3-point bend tests
and Charpy Impact tests were conducted. Experiments were conducted that were designed to
characterize the influence of adding Kevlar to the composite structure and also the influence of
pre-mixing glass microspheres into the epoxy. These new additive manufactured (AM)
composites are an attractive choice to designers attempting to reduce weight because any 3D
printed shape can be reinforced in this manner. Additionally, actual production time is less than
3D printing a fully solid component.Mechanical Engineerin