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Oct 19, 2019, 06:41 PM
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Broken steering knuckle

It broke after only 6 months. Knocking the wheels the right way, rather than old age, is how they break. The only replacement part is the fabled Tamiya Shaft Bag 58347, long out of production. There are aluminum ones in China with a 6 week waiting time.

Lacking any replacement parts, the lion kingdom attempted a teflon repair. The bolt isn't long enough to reach through the teflon. Teflon is softer than the original nylon.

During this process, it became clear the steering rods could be 1 hole shorter, so the wheels would have to be realigned for the teflon repair & aligned again next year when the China shipment arrived. All this wheel alignment had the lion kingdom searching for a better way. Lions traditionally aligned the wheels by driving a mile, recharging the battery, & measuring the charge. The charge depended on the wheel alignment as well as the battery temperature, & how charged it was yesterday.

The ideal way is to drive a certain distance & record the PWM, but this requires a constant battery voltage. A Rudeng/RIDEN voltage regulator is still the ideal solution for getting a portable, constant voltage. Getting one is another 6 week China shipment.

It was while searching for a voltage regulator that lion kingdom realized this was what Sparkfun sold, 15 years ago. What did Sparkfun sell nowadays? Manely dumbed down educational kits for large schools, big ticket items for corporations, & some standard connectors. Their power supply offerings where now the laptop bricks office supply stores sold 20 years ago instead of the bare boards they used to sell.

Exotic parts for starving college students & programmers are now only available in China. The next option is building a fixed voltage buck converter out of digikey parts, the same way lions would have done it 20 years ago.

There may just be no money to be made in exotic parts just for building other things. They'd rather buy something prebuilt.
Last edited by Jack Crossfire; Oct 19, 2019 at 06:51 PM.
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Oct 20, 2019, 10:28 PM
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Do you have access to 3D modeling software and a 3D printer to make a replacement? If not, would you'd you be willing to mail the part to somebody to reverse engineer and make you a new one?
Oct 22, 2019, 03:49 PM
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LemonC's Avatar
are you using a Tamiya Lunchbox?

when i was a kid, my grasshopper had pretty much the same knuckles... dont drive in cold weather.!

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