Coming straight from the Cretaceous period,This T-Rex Skeleton was modeled and designed to be a miniature representation of the terror of the past. The project was designed to be standing model of a skeleton.
Overview and Background
To Create the Dinosaur
To Start the project, we printed a scaled image that is the same size as the projected construction box. To scale the image, we did the math to determine the scaling factor pictured below. We then made measurements and marked the image to represent the relative size of different portions of the model, pictured below.
Make a constraint box that is 8.89cm X 7.3cm
Make the Head
Make a rectangle that is 4cm X 2.7cm.
Cut the corners by chamfering, and rotate the head so that top and right corners line up with the constraint box.
Make the spine
Make eight points that are at the location starting at the origin, and curve up to about 4.7cm X 5.7cm.
Using a double sided offset entities, make a rectangular spine that is 15mm away from the original curve.
Create a triangle at the bottom of the curve, by making a rectangle that is 1cm X 1.6cm, and chamfering the sides.
Making the Ribs
At each of the original points, make a rectangle that is 0.8cm wide, and changing in height from 1.6cm to 1.1cm.
Make the Eye
Create a circle that is 1/2cm in diameter that is located roughly 1 inch above the eight point.
Make the Arm
Make a rectangle that is 1cm X 1cm, and cut from bottom corners to .3cm in on the top. Chamfer the edges, and attach to the bottom of the right side of the last rib.
Make the leg
Make rectangle 2.5 cm x 1.4 cm
chamfer bottom right corner 0.1 cm X 0.1 cm
Make a point that is 1 cm and 0.3 cm from the bottom left corner
Make connecting lines to the corers and remove the outside line.
Make a point 1.3cm from the left and 0.5 cm from the top
Make a connector line from the point to the right and left sides, and trim extra lines.
Fillet the upward triangle that by 0.5 X 0.5.
Make the mouth
Place 2 line that are 1.6cm and 1.7cm that are .75cm and parallel from the bottom of the head.
Place three points that are .3cm from each line at .15cm, .75cm, and 1.4cm from the opening of the mouth on the top, and .2cm, .9cm, and 1.4cm from the opening on the bottom line.
Create connecting line to the midpoints on the lines above or below. Erase extra lines.
Extrude whole thing by 1cm, and chamfer all edges except the spine by .1cm. Chamfer the spine edges by 0.05cm.
The design was based off another Thingiverse model, called Flexi Rex by Dr.Lex, except the model was changed to be a 2d image that was a single piece, rather than multiple pieces and a 3d model. To make this change we extended the spine through the contour of the image to allow it to become a single piece that is 2d. The finished project is more or less created entirely thought that design model, but several measurements were slightly altered to fix the total length and width, which were initially too larger or small and didn't add to the intended total.
Each individual section was made separate, and then they were conjoined together with remaining and extra lines cut off, leaving a single contour of the dinosaur skeleton.
To measure where each individual part, we placed an arbitrary point, usually a place on the spine where the rib would intersect, or where different parts would connect, and measured how far the point was from the X-axis (the bottom of the constraint box) and the Y-axis (The left side of the constraint box).
The rotation of each rib and the head were sort of arbitrary and we never defined to what degree they would be rotated, which became an issue down the road.
The spine was created by planting those measured points and then creating a spline that connects them.
We chamfered the corners on the top face so that the edges were not sharp, which was not originally planned, as we had planned to fillet them.
Additionally, because of numerous small measurement additions to the ribs, tail, and head, a planned 7th rib was deleted from existence because of limited room.
Lesson Plan and Activity
The problem statement was: With a partner, you will design a “2D” placard using Solidworks. You and your partner will have the same design which meets the constraints below, and you will EACH use Solidworks to create your design.
The 2d model was to have a flat back and fit in a constraint box with an area no larger that 65cm^2.
The model will be extruded to no more than 1cm thick, and any details will be made by sketches extruded to different heights.
Sketches were to begin with a center rectangle constraint box located on the origin.
The dimensions of the model should be detailed but efficient, and fully defined.
There should be no error messages in the model.
The model and project creation should demonstrate effective use of construction geometry, offset entities, manual relations, smart dimensions, mirroring and linear patterns.
The project was to be done so that a design was chosena for each group and the image base was to be scaled to an area of less than 65cm^2. A plan was then to be created, which is shown above, and each partner is to follow the plan as stated individually. They then are to meet together and synchronize their projects.