Chassis

[Brett-Higginbotham]

Description

The Chassis is the central structure for the rover that all other subsystems will mount onto

Constraints

• Large enough to contain various equipment such as PCB's, 40v batteries, and other sensors
• Designs with mounting locations for 3 and 4 legs
• Rail system for changing mounted equipment between challenges such as science, storage bucket
• Easy access to the inside either via a door or quick release panel
• Mounting space for Comm Tower on rail panel or side
• Mounting space on roof for Arm
• Wiring passthroughs to each of the legs for drive, rail panels for attachments, and the roof for arm

Materials

• Aluminum extrusion and brackets for frame
• PLA/PETG for panels

Electronics

• 40v Batteries
• Dorito
• E-Stop

[Brett-Higginbotham]

Initial 3 and 4 legged Turtle designs

Inverted Turtle would provide more stability but less ground clearance

[MayaEnriquez]

External Mounts Needed:
Kill Switch
Battery
Cameras x1(x4 ideally)
Comm Tower
Science
Fans x2 !!
Suspension Mounts x3(or 4)

[kammce]

What are the fans for?

[Brett-Higginbotham]

R2D2 chassis design

https://bulkman3d.com/product/makerlink-120-angle-tee-nut/
120 Degree connectors, not the most robust but they are low profile

https://www.aliexpress.us/item/3256805689338319.html?src=google&aff_fcid=049dc95a26a14b7ea6eab44b01d2311e-1694892855662-01548-UneMJZVf&aff_fsk=UneMJZVf&aff_platform=aaf&sk=UneMJZVf&aff_trace_key=049dc95a26a14b7ea6eab44b01d2311e-1694892855662-01548-UneMJZVf&terminal_id=190fa628e42749f6a5041113daa03d64&afSmartRedirect=y&gatewayAdapt=glo2usa

https://www.amazon.com/gp/product/B076DNR5DY/ref=ox_sc_act_title_1?smid=A3J5E5ZOT6VBB2&th=1

https://www.amazon.com/DGOL-Stainless-Toggle-Loading-Install/dp/B0B5SNY3WB/ref=sr_1_52?crid=2B3XSOGCLUV36&keywords=adjustable%2Btoggle%2Blatches&qid=1694915702&sprefix=latches%2Badjustable%2Btogg%2Caps%2C163&sr=8-52&th=1

https://www.amazon.com/Socell-180Pcs-Hammer-Fastener-Assortment/dp/B07Z4YH6NP/ref=sr_1_3?crid=1YY8Y0ORV60OC&keywords=metric%2Bt%2Bslot%2Bassorted&qid=1694915085&sprefix=metric%2Bt%2Bslot%2Bassorted%2B%2Caps%2C137&sr=8-3&th=1

https://8020.net/deflection-calculator
2020 extrusion should have sufficient deflection given the the edges of the hexagon are below 300mm. Personally I think making the edges ~250mm would be better so the cross members in the middle don't have to be as long. I updated the CAD to show 20x20x250.

[Brett-Higginbotham]

https://us.misumi-ec.com/vona2/detail/110302685230/

[Brett-Higginbotham]

https://cad.onshape.com/documents/a8e6d55c864f42a69a0a9edb/w/4c27f878989022372fe97c30/e/586d451586263f66d2667091

Current frame design and shopping list