On 20/12/2020 11:03, Brian G wrote:
How can that work, though many moons ago a tomorrows world item featured a
spun up flywheel powered dril which i thought at the time a completely
pointless invention.
Brian



The last minute of the video shows it working, rotating the drill bit
slowly by use of a hand crank . The video is the restoration of a rusty
item back to new involving fully stripping the unit down to the smallest
component part and either refurbishment or replacement of parts.

Internally there is a large lump of steel acting as a hammer. A hand
crank rotates this hammer via some gears.

There is also a cam like mechanism that moves the hammer forward a
little via spring loaded lever arrangement, also operated by a hand
crank. The mechanism forces the hammer forward a few times per one
revolution of the hammer. The hammer is seemingly moved back again by a
combination of the large spring on the lever and the operator pressing
the drill into the wall.

Possibly operation is hard work - at the back is a brace so that you can
push the drill into the wall with your shoulder.

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