Page Comparison

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The idea behind this design is to create a “tray” (Fig. 1) to constrain movement in the outer edges of the specimens. Multiple specimens can be cured at the same time in this tray. The spaces between each individual specimen will be separated with rectangular 3D printed jigs (Fig. 2) as well as the spaces between each adhesive joint on a specimen (Fig. 34). A flat board/weights will be placed on top of all specimens to add pressure.

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Fig. 1: An image of the base tray for the testing jig

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Fig. 2: An image of one rectangular jig

Figure 3, seen below, is a side view of one test specimen. This is how they will be aligned in the jig. The rectangular jigs will be placed in the gap spaces.

Fig. 23: Side view of specimen in tray

Figure 3 4 is an example of how the jig will clamp the test specimen. The green planks are aligned as seen in Figure 2. A flat board should be placed on the ground first and then the specimens should be placed on top of it. Then3. The main tray shouThen, a flat board (like a piece of plywood for example) will be placed on top of the specimens and weights will be placed on top of the board to apply downwards pressure on the z axis (purple). There will be four longer boards, two per axis, that run parallel with the sides of the specimens on the x and y axis. These boards are in place so that pipe clamps can apply pressure from the sides (red). The idea is that the blue square-shaped pieces will ensure that the test pieces line up properly under clamping force. It is possible that more thin brown square pieces may need to be added in the middle section. Nine of these specimens can be lined up at once inside of this tray.

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Fig. 34: Example of how specimen will be placed in tray

Adhesive Anti-Sticking Solution

Adhesive to be Used: 3M DP 420 and Henkel EA E-120HP (both epoxy adhesives)

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• Parchment Paper

• Wax Paper

• Polyethylene sheeting (saran wrap)

• Mold-release compounds for epoxy

• PTFE Tape

Anti-Stick Solution Criteria Overview:

*ranked in order of most important to least important

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• How much the anti-stick solution will alter the dimensions of the fixture and specimen (how thick is the solution)

Table 1: Anti-stick Solution Comparison Chart

Results:

Parchment Paper = 41 pts, Wax Paper = 38 pts, Saran Wrap = 45 pts, PFTE Tape = 27 pts

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Overall: Saran wrap is the best material to use due to its ease-of-use and effectiveness. It is also one of the more affordable options and is easy to maintain.

Assembly Procedure 

Step 1: Printing

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1. Use AutoCAD to create layout of pieces that need to be laser cut. In total, this needs to include 4 copies of each component of the tray.

   1. The idea behind this is to stack four 1/8 inch thick pieces of fiberboard to create a 1/2 inch tall tray.

   2. Minimize the area occupied by the pieces. This is because the 3D Print Centre charges per square foot.

   3. All vector cut lines should be 0.00 units line thickness and all raster/engraving lines should be set to a minimum of 0.25 units.

2. Submit a laser cutting request: https://uwaterloo.ca/3d-print-centre/laser-cutting-request-form

   1. Turnaround time is 2-3 days.

3. Use wood glue to bond two copies of the same part.

   1. Apply a thin strip of wood glue along the entire piece.

   2. Clamp down both pair

Step 4: Anti-stick Solution

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