EKThe Eja ropeless gear system consists of three parts: Release Mechanism, Intelligent Buoy, and Onboard Gateway. Here are the mechanical design specifications for each, also available as a pdf here.
Release Mechanism
3D viewer: https://a360.co/3msDSha
Files: https://github.com/RobotGrrl/Hackaday-CXL/tree/master/Design/release_mechanism
Length | 52.9 cm |
Width | 39.0 cm |
Height | 32.9 cm |
Approximate Weight | 15 lbs / 6.8 kg (including ballast) |
Materials | 0.375 in HDPE base, PLA 3D printed pieces |
Max Depth | TBD |
Eja Bill of Materials - Release Mechanism |
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Last Updated: Sept. 18, 2020 |
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All fasteners for prototype are zinc-plated steel |
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Item | Qty | Cost (USD) |
| McMaster Part # | Source | Notes |
M6 x 16 mm | 32 | 3.32 |
| 90128A263 |
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M6 x 25 mm | 30 | 3.97 |
| 90128A265 |
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M6 Washer | 50 | 2.15 |
| 98688A116 |
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M6 Hex Nut | 62 | 1.61 |
| 90591A151 |
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M3 x 10 mm | 12 | 1.70 |
| 95263A134 |
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M3 x 16 mm | 12 | 2.11 |
| 95263A158 |
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M3 Washer | 28 | 0.96 |
| 98688A112 |
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M3 Hex Nut | 24 | 0.56 |
| 90591A250 |
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Magnets N52 (large) | 5 | 4.85 |
| 5862K116 |
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TOTAL MECH COMPONENTS | 21.22 |
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0.375 in Natural HDPE 24 x 48 in | 0.5 | 42.50 |
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| Cost / in^2 = 0.04 | |
1 kg 3D Printer Filament PLA | 2 | 57.98 |
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Misc. rope, cord, carabiner | 1 | 5.00 |
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| Random |
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10 lbs Dumbbell | 1 | 7.00 |
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| Canadian Tire |
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Spool holder | 1 | 1.00 |
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TOTAL MATERIALS | 113.48 |
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CNC machine time | 20 | 20 |
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| DesignLab | 1 / min |
3D printer time | 1200 | 60 |
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| EK's 3D printer | 0.05 / min |
Injection moulding time | 0 | 0 |
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Assembly time | 90 | 22.5 |
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| EK | 15 / h |
TOTAL MACHINE TIME | 102.5 |
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GRAND TOTAL | 237.20 |
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Parametric Design
Here are the values used for parametric design
Intelligent Buoy
3D viewer: https://a360.co/3hJjc0R
Github: https://github.com/RobotGrrl/Hackaday-CXL/tree/master/Design/intelligent_buoy
Diameter | 9.3 cm |
Height | 20.8 cm |
Approximate Weight | 500 g |
Materials | Polycarbonate (‘Tritan’), PLA 3D printed pieces, Neodynium magnets, FR4 circuit board for structural strength |
Waterproof Rating | Waterproof* *Further testing is needed to determine depth |
Eja Bill of Materials - Intelligent Buoy B |
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Last Updated: Sept. 18, 2020 |
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All fasteners for prototype are zinc-plated steel |
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Item | Qty | Cost (USD) |
| McMaster Part # | Source | Notes |
M2.5 x 8 mm | 4 | 0.54 |
| 90128A184 |
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M2.5 x 6 mm | 14 | 1.85 |
| 90128A183 |
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M2.5 Washer | 4 | 0.13 |
| 98688A111 |
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M2.5 Hex Nut | 8 | 0.18 |
| 90591A270 |
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M3 x 10 mm | 4 | 0.57 |
| 95263A134 |
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M3 Washer | 0 | 0.00 |
| 98688A112 |
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M3 Hex Nut | 4 | 0.09 |
| 90591A250 |
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Magnets N52 (small) | 4 | 3.04 |
| 5862K103 |
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Magnets N52 (large) | 5 | 4.85 |
| 5862K116 |
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TOTAL MECH COMPONENTS | 11.24 |
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Nalgene 1L wide mouth enclosure | 1 | 20.00 |
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| SportChek |
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1 kg 3D Printer Filament PLA | 0.25 | 7.25 |
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Misc. glue, wires | 1 | 1.50 |
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| Random |
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TOTAL MATERIALS | 28.75 |
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3D printer time | 60 | 3 |
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| EK's 3D printer | 0.05 / min |
Injection moulding time | 0 | 0 |
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Assembly time | 20 | 5 |
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| EK | 15 / h |
TOTAL MACHINE TIME | 8 |
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GRAND TOTAL | 47.99 |
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Onboard Gateway
3D viewer: https://a360.co/32DGUHE
Files: https://github.com/RobotGrrl/Hackaday-CXL/tree/master/Design/onboard_gateway
Length | 15.6 cm |
Width | 8.5 cm |
Height | 6.3 cm |
Approximate Weight | 300 g |
Materials | PLA 3D printed pieces |
Waterproof Rating | Not waterproof |
Eja Bill of Materials - Onboard Gateway |
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Last Updated: Sept. 18, 2020 |
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All fasteners for prototype are zinc-plated steel |
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Item | Qty | Cost (USD) |
| McMaster Part # | Source | Notes |
M2.5 x 8 mm | 8 | 1.07 |
| 90128A184 |
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M2.5 x 6 mm | 0 | 0.00 |
| 90128A183 |
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M2.5 Washer | 0 | 0.00 |
| 98688A111 |
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M2.5 Hex Nut | 8 | 0.18 |
| 90591A270 |
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M3 x 10 mm | 4 | 0.57 |
| 95263A134 |
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M3 Washer | 0 | 0.00 |
| 98688A112 |
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M3 Hex Nut | 4 | 0.09 |
| 90591A250 |
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TOTAL MECH COMPONENTS | 1.91 |
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1 kg 3D Printer Filament PLA | 0.75 | 21.74 |
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TOTAL MATERIALS | 21.74 |
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3D printer time | 180 | 9 |
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| EK's 3D printer | 0.05 / min |
Injection moulding time | 0 | 0 |
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Assembly time | 10 | 2.5 |
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| EK | 15 / h |
TOTAL MACHINE TIME | 11.5 |
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GRAND TOTAL | 35.15 |
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