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- After the CoDR, it was decided that a physical connection must not be present between both stages.
- The guide will stop the sustainer from rotating unnecessarily and removes the need for shear pins to connect both stages which reduces spring constant requirements.
- A tight tolerance with low friction is required.
Final Design - V1:
- Use Nichrome in tension instead of Dyneema.
- Only a single piece of Nichrome is used to hold the springs in compression. From initial calculations, 2 mm gauge Nichrome was enough due to the high tensile strength of Nichrome.
- Nichrome can be wrapped around the bushing at the top of the interior of the staging cone below the screw for attaching the shock cord.
- Spring (5in length, 1.225 in outside diameter): https://www.grainger.com/product/SPEC-Compression-Spring-Heavy-Duty-54NR98
- Tensile testing for Nichrome.
TO DO:
- Meet with Zachary Cordero - Will he let us print this? technical expertise with what problems might arise? Does he have the Aluminium alloy for us to use to print? Surface Roughness? Ask if oxide layer forms
- If 3D printing is not an option, speak to Todd about machining the cone.
- Make sure to include fillets in CAD if so because Mill and lathe manufacturing will create a fillet.