Finalist

3D-Materials for Mechanical Design and Drawing Education--Technical Assistance Through Experience
Tsutomu Araki

Tsutomu Araki “3D-Materials for Mechanical Design and Drawing Education --Technical Assistance Through Experience” 2017, Material: VeroWhite, Size: 55W x 53D x 10H (mm)This is a collection of teaching materials for mechanical modeling, intended to deepen the students’ thinking, encourage criticalassessment, and enhance their capabilities in creating the best products through the educational application of machine designing/drawing and computer-aided design. We encourage our students to comprehensively experience and be educated by use of thesematerials for learning technical drawing, through user experience evaluation of student-designed shapes and functions, and trial
production of blocks to learn about the processing accuracy or characteristics of 3D modeling machines. These are selected examplesof our methods for supporting design and drafting education at our university.

42

Finalist

Keywords: Teaching materials, Materials for drawing method, Hands-on experiences, Consciousness of modeling accuracy, Hints for
3D-modeling, Optimization

1 Materials for students to deepen their thoughtthrough hands-on experiences
Tsukuba University of Technology (NTUT) is the only higher
educational institute for the hearing or visually impaired inJapan. In the Mechanical Engineering Course, we educate
Figure 2: Hand winch’s handle lever (Left, in a red circle), Students’ design for hand winch’s Ratchet wheel (Right)

hearing-impaired students. And we educate with emphasis
on Mechanical Design and Drawing because students with anengineering education typically go on to join a company
where they are involved in design and CAD. Tsukuba
University of Technology (NTUT) introduced an inkjet type3D-modeling machine in 2007. Since then, we have beenusing the machine for the education of design drawing, andcollecting data on experience and knowhow for effective use.

Figure 3: Handle lever R1 model, Exhibition stand and pin

Utilization of 3D-CAD and 3D-modeling at our university isgrip condition of each fillet.

a means of motivation and communication for high quality

Teaching materials to try and feel in one’s own hands.

design and drafting education for hearing-impaired students.

Students will be able to optimize their mechanical design.

The model introduced here is part of the teaching materials

One of the small stacks to improve one’s own sense offor the development of education.

design.

2 Works of 3D-model as teaching materials

2-2 M20 Teaching materials of Bolt screw: 3D-model for

2-1 Handle lever: Teaching material of function of lever

Exercises on Machine Design Drawing and Practice of Manufacturing Processes as a Teaching material.

Figure 1: Aseenbled handle levers FILLET R0, R1, R2, R3, R4,
R5 on a Exhibition stand (Left side), Usage of a handle lever for
Ratchet wheel of Hand winch (Right side)

Figure 4: M20 Bolt as a Teaching Material

43Finalist

When producing with a 3D-modeling machine output at

2-4 Materials for teaching of drawing: Teaching materials

200%.

to show how to draw in the same form as the diagrams oftextbooks and to gain a better understanding.

2-3 Projection teaching material: projection drawing method

Produced as a model to use for explanation of drawing.

Teaching material for explanation of projection method.
Made with transparent material. You can see the same
explanatory symbol as in the textbook on each side.

Figure 8: Teaching materials 3D-CAD data for simplified drawing example of intersection same as text bookFigure 5: 3D-CAD data, Size: 40W x 30D x 50H (mm) and 3Dmodeling (Right side), Figure from textbook (middle side)

Figure 6: Figure from textbook

Figure 9: Simplified drawing example of intersection, figure
from textbook

Figure 7: Easy to produce by 3D PrinterFigure 10: Eyebolt, 3D-CAD data and figure from textbook

44

Finalista.

Models for consciousness of modeling accuracy of3D-modeling machinesShafts and bearings are often used for precision mechanismmodels. Regarding to the dimensional accuracy: It is important to compare the dimensions of the drawing data of length,
width and height with the actual size of the height, width andheight of the 3D-model, and to know the machining accuracy
Figure 11: Chuck Handle, 3D-CAD data (assembled data andparts) and figure from textbookof the 3D-machine. When manufacturing a cylinder (shaft)A model for showing the same shape as the drafting sample

the machining dimensional accuracy of the 3D-machine byof the textbook.

horizontal placement and vertical placement.

Even if the real standard of the same standard exists in theThese are models for consciousness of modeling accuracy offactory, it is often different from the form of the drawing

3D-modeling machines.

or a perfect circle (bearing) by 3D-modeling machine, checkmodel of the drawing textbook.
For example; “Eyebolt”, “Chuck Handle”.
2-5 Assembling on the 3D-CAD monitor / Assembling realparts by 3D-modeling machine: Experiencing assembling
on a monitor of 3D-CAD and assembling real parts which

Figure 12: Test pieces by 3D-CAD data and 3D-modeling φ25 x50W x 50D x 50H (mm)are made by 3D-modeling machine.
Insert a shaft of diameter 10 mm into a diameter 10 mm hole.

b.

Although parts can be assembled on the monitor of 3D-CAD,

Model for the possibility of shaping --Performancethe producted axis by this size does not enter the hole in thecheck: Precise forming for 3D-machine and Deform-

real model of this size. Please try it.

ing for materials ( φ1, φ2, φ3, 50mm(H) )Whether precise shaping is possible at a height of 50 mm

You will be able to recognize that it is necessary to think
about dimensional tolerance for the machine design.

2-6 Considering that it is made with a 3D-modelingmachine according to 3D-CAD drawing data: Test
pieces for effective useage of 3D printer features
Awareness of processing.
Consciousness of modeling accuracy.

Figure 13: φ1, φ2, φ3 x 50H(mm), φ1_3D-modeling45

Finalist

with a diameter of 1 mm. It may be deformed with the passage of time due to the shaped material. For our 3D modeling machine and materials, we can shape them. However, inthe case of a 1 mm diameter pillar, it bent after making it.
Figure 16: Size 10%: 22W x 10D x 9H (mm), (Left side) Size
30%, 20%, 10% model, (Right side)

2-7 A model offers the possibility of manufacturing
as an industrial product, even though it can be madewith a 3D- modeling machine

the bottom of the car that is under the shaft.
Devices for removing support agent that fills the gap forturning the axle and hole tire with jet water stream.
Precise model of one sample of small 3D-modeling; it can below cost material and therefore easy to share.

3 Usage of the New Method to Make Specimen for
Photoelastic Test
It was found that a 3D-modeling machine can easily produce

Figure 14: 3D-CAD data (L) and 3D inkjet modeling figure (R)specimens for photoelastic tests. Any shapes of specimens

2-8 A model that allows you to think about devisingwhen making with 3D-modeling (a model thatmakes you think of the necessity of ingenuity)

can be produced based on a 3D-CAD drawing, as if theyGood model for PR-Car use.

is a simplified one made of a tracing stand furnished withPrecise model as one sample of 3D-modeling for it can be

LED plate illumination of white light shining on thecheap.

specimen from behind. As students got more familiar with--- Scale: Output size 10% of 3D-CAD modeling data (maketests, the items they need to consider in design increased

were printed by a printer. This enabled us to implement
photoelastic tests without difficulty. The apparatus used here

it easy to draw output with the desired percentage size).
Make a slit to remove support agent with jet water stream atFigure 17: 3D-modeling machine can easily produce specimens
for photoelastic tests. With notch at the upper part and stressconcentration can be seen (Right side), none (Left side)

Figure 15: Good model for PR-Car use; tire axle also rotate

46

Finalist

Figure 18: Photoelastic tests with notch and none (Left side),With notch inside the photoelastic test (Right side)much more. We expect to have further opportunities todevelop new areas of the utilization of CAE including
3D-CAD and 3D-modeling.

Figure 19: As a teaching material to make sense of modeling experience in one class period “Making a mini-hanko”

Various shapes and notches can be made freely. I believethat the scope of further utilization will expand as a teaching
Modeling Machine which offers a chance to think and try do-own interest, we hope students can get a hold of theing by ourselves.

techniques of technical design drawing and CAD usage
positively.

4 The first 3D-CAD experience teaching material atour university

5 Software & System--Making a mini-hanko (personal stamp): Basic 3D-CAD

Software: Autodesk Inventor

operations and 3D RP modeling

Modeling machine: Objet EDEN260, inkjet modeling ma-Manipulation of 3D-CAD and production of 3D-model usingchine

mini-stick teaching materials. As a teaching material to
make sense of modeling experience in one class period

References“Making a mini-hanko”. Hanko means one’s own name[1] Araki, T., Nakamura, N., Honma, I., Educational Assis-stamp.

tance Through Modeling in Tsukuba University of Tech-

Through the making of a mini-hanko by 3D-CAD and 3D RP

nology--Professional Education for the Hearing or Visu-modeling, students can learn about the basic operations ofally Impaired, Computer Aided Drafting, Design and3D-CAD, as well as the development flow from data drawing

Manufacturing (CADDM), China Graphics Society,to manufacture. Of course, using and trying is real modeling.

Vol.25, No.4, pp.58-65, 2015.

Production costs are low, production time is short. The pro-[2] Araki, T., Hirano, S., Development of cooperative educa-

duction of a strapped mini-hanko that students can actuallytion and basic engineering education: aided by 3D CAD

use afterwards serves as a summary of the basics of CAD.

and 3D RP modelling, Int. J. Computer Applications in

By guiding students through a production process of theirTechnology, Vol.51, No.1, pp.80-85, 201547