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Re: How are you getting over the 4" bump?
Our frame's extruded aluminum (30x30 hand cut and welded). We toyed with a mechanized skid plate, treads, etc. In the end, one of the mentors and a student came up with the idea of putting angled braces on wither side of the front wheels.
Top view:
BBBBBBBRACE
Wheel
BBBBBBBRACE
Side view: (W=wheel)
Frame
WBrace
WBrace
WBrace
WBrace
The first wheel goes up, the skid braces hit and get you up then the rest of the 8 wheel drive takes over. Makes for a bumpy ride but in the end, it works. However you attach it, make sure they've got good welds/attachments and something like teflon on them to make things easier.
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"Complications arose, ensued...were overcome." "I'd trade 500 CNC machines for one good hearted student."

From December to April, since 2002, I forfeit my mental sanity for perfect insanity.
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