How can a ten-centimeter thick stick be processed into a circular wheel rim?
How many degrees should it be heated in the furnace?
When the temperature gets high, it softens, then take it out, bend it around a round stone to form a circle, and secure it with a few nails. Once it cools, it will naturally become circular.
Then drill holes in the wheel rim; Ma Lin can drill these holes very accurately, as long as he puts his mind to it.
What structure should the axle's cylinders use? How can it be drilled to ensure that it doesn't crack under weight?
If there is iron wire or copper wire to tighten this cylinder, it might be more solid and not crack.
He doesn't have copper or iron wire.
Besides, both the pivot and bearing are wooden and not perfectly round, so won't the friction between them make pushing this cart very tiring?
The more he thought about it, the more exhausting it seemed.
He has no idea what the solution is.
