Dangerous homemade grinding/chainsaw conversion

[Jon]

Here's the main criticism: no brake, no chain catcher, and the chain moves whenever the tool is powered, as opposed to using a centrifugal clutch that does not engage the drive when the tool is idling.

Less important, but still worth mentioning: no safety gear, and wobbly methods for securing the logs. To their credit, the second video does show a guard that they made.

More stuff, some admittedly nitpicky: https://en.wikipedia.org/wiki/Chainsaw_safety_features

In the first video, unless something is happening off-camera that we can't see, the tool is converted without ever unplugging it.

Despite all of this, it's still clever, and this concept can be harvested for "idea value" for making various homemade tools.

[Workshopshed]

Although I agree that the on off switch you commonly get on a grinder is not appropriate for a saw. If you let go it should stop.