Machining gears in South Asia - video

[metric_taper]

How does used motor oil perform as a cutting fluid? I've always been told it's terrible and not to use it, so I've never tried. They might not have access to proper cutting fluid, but I would imagine kerosene would be readily available.

Also they really need a dial indicator.

That previous video of the same work shop that was making roller chain sprockets, did all the work without an indicator, just an antique caliper, and eyeball.
Oh ya the tape measure.
Seems all their jobs would have some eccentric runout, that you could hear when the machines were running.