Page Comparison

Designed by: Ethan Sobkowich, Yanshen Zhou, Winnie Lin

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Figure 7, seen below, is a side view of one test specimen, whose material may vary depending on the test. 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)

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Fig. 7: A 3D model of the specimens glued together

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Fig. 9: Example of how specimens will be placed in the tray. This assembly can be viewed in the GrabCAD (requires login first: https://workbench.grabcad.com/workbench/projects/gcwijX10VhtEeZ8mtyGdmiV5BQItzO7K-9PXmyIs5vRPFL#/file/559665489 )

Engineering Design Specification Chart

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Source: https://www.youtube.com/watch?v=uLH1MsaHnX4  

one design matrix per step

Assembly Procedure 

All related CAD files are found here (MSXIV->Devlopment->Materials Testing-> Adhesive Curing Fixture): https://workbench.grabcad.com/workbench/projects/gcwijX10VhtEeZ8mtyGdmiV5BQItzO7K-9PXmyIs5vRPFL#/folder/10457511

Step 1: Printing

The pieces separate individual specimens and individual components within the specimen. 3D printing was chosen as the manufacturing method as they need to be thin (<1mm) to fit under the paces of the specimen.

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1. Use PrusaSlicer to print an array of support pieces on the tray. Two of the longer spacing supports “30mm mid jig” pieces are required per specimen and 3 three of the spacing supports “separating jig” pieces are required between two specimens.

   1. You may need to change the dimensioning of the support beams to customize it to the dimension your specimen.

   2. Print according to the number of specimens that are cured.

2. Remove the printed pieces.

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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. There is an AutoCAD .dwg file on the GrabCAD- use this template as a base for your dimensions. Change accordingly so the fixture can cure the desired number of specimens.

   1. Ensure that your dimensions for the inner length and width of the tray is equal to the width of all the support pieces and the specimens.

   2. The idea behind this is to stack four 1/8 inch thick pieces of fiberboard to create a 1/2 inch tall tray. Ensure that each part in the .dwg file is quadrupled. Please minimize space taken up by the drawing (this minimizes cost).

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

   4. 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 pairs of fiberboard pieces for curing. This takes 24 hours according to the glue manufacturer instructions.

   3. After the pairs of fiber board have fully cured, repeat steps a-b to bond the two pairs of fiberboard. This creates four stacked layers of fiberboard.

   4. After curing, use sand paper to sand off any excess glue.

   5. Note: it is important to cure the layers as aligned as possible to create a flat edge.

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generally less walls of text. pictures explain for you, just use the right pictures.