Designed by: Ethan Sobkowich, Yanshen Zhou, Winnie Lin
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Needs statement: There exists a need to create a fixture that can hold specimens a stationary position for adhesive curing while being adjustable to different specimen sizes. adjustability?
Constraints:
All three adhesive joints curing at the same time
Constrained movement in three axis
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Steel to steel
Composite to composite
Steel to composite
go thru reasoning to do this design. decision making matrix
show dimensions and material
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Fig. 1: An image of the base tray for the testing jig
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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.
*jig can be spring with boards on either side (will remove tolerance error)
Fig. 3: Side view of specimen in tray
Figure 4 is an example of how the jig will clamp the test specimen. The green planks are aligned as seen in Figure 3. The main edges will be placed on a flat board or table. Then, another 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). When the tray is full of specimens and brown rectangular jigs, seen in Figure 4, y-axis movement will be restricted due to the packing of specimens an jigs. A sliding board will be on the edge and a pipe clamp will apply inwards pressure on the x-axis. The idea is that the blue square-shaped pieces will ensure that the test pieces line up properly under this clamping force. It is possible that more thin brown square pieces may need to be added in the middle section to ensure adequate restriction on movement. Nine of these specimens must be lined up at once inside of this tray for proper usage.
put ALL specimen. show board above
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Fig. 4: Example of how specimen will be placed in tray
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Table 1: Anti-stick Solution Comparison Chart
color code this
Parchment Paper | Wax Paper | Saran Wrap | PFTE Tape | |
|---|---|---|---|---|
Ease-of-use Weighting: X2 | Use sheets to cover exposed areas. Some openings will need to be taped up 7/10 | *Same as parchment paper 7/10 | Cling wrap does not need tape. Works fine 9/10 | Needs to be taped on to all exposed surfaces 6/10 |
Effectiveness Weighting: X3 | Epoxy peels off easily. 9/10 | Slightly worse than parchment paper. 8/10 | Same as parchment paper 9/10 | Epoxy needs to be chipped off of tape. Stickage may occur. 5/10 |
Affordability | 12 in X 75 ft $7.99 CAD @ Canadian Tire | 75 in $4.49 CAD @ Canadian Tire | 25 m $1.79 CAD @ Canadian Tire | ½ “ X 480” $0.79 CAD @ Canadian Tire |
Maintenance | Remove tape and paper after each use | Remove tape and paper after use | Remove wrap after each use | Can reuse multiple times |
Feasibility | Can be found in most retail/grocery stores | Can be found in most retail/grocery stores | Can be found in most retail/grocery stores | Can be found in hardware stores |
Level of Obstruction | *Reference | Thinner than Wax Paper. | Thicker than Parchment Paper. |
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Source: https://www.youtube.com/watch?v=uLH1MsaHnX4
add some figs
one design matrix per step
Assembly Procedure
Step 1: Printing
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Double wrap supports with saran wrap
Tape off loose ends
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Step 5: Placing Specimens in Place
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Item | Amount | Description of Use | Supplier | Total Price |
|---|---|---|---|---|
1/8” Fiberboard | 2 square ft. | Material for laser cutting. Creates tray. | UW 3D Print Centre | $4.00 + tax |
ABS Printing Filament | 1 kg | Support material in between specimens and within specimen pieces. | Amazon (if no sufficient supply in Bay) | |
Saran Wrap | 900cmx30 cm | Prevents epoxy from curing to the fixture. | Walmart | |
3mm Birch Plywood | 20cmx30cm | Applies pressure from the top of curing fixture | E3 Machine Shop | |
Wood Glue | 236mL | For gluing the layers of laser cut fiberboard together. | Canadian Tire | |
Total cost per one fixture (CAD, includes tax) | $51.63 |
generally less walls of text. pictures explain for you, just use the right pictures.