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Lesson�7:�The�Hand�Drill
Teacher’s Note’s:
If resources permit, allow the
children to investigate, first hand,
the structure of a real drill bit,
especially noting the spiral grooves
that run along its length.
Please refer to the Safety Guidelines
in this guide to ensure adequate
safety measures are taken.
A hand drill usually has a small gear
wheel turning a larger gear wheel
that turns the drill bit. The gear
arrangement of a small gear wheel
turning a large gear wheel makes it
easier to turn the drill bit in the wood.
Working in Groups of 2-3
 • ExplainhowthechildrenwillmakeaK’NEXmodelofa
drill bit to investigate how it works.
 • Beforestartingtobuildtheirmodel,askeachgroupto
plan how they will make the two components of the
K’NEX model if they are given only 10 minutes to
complete the task.
 • Alloweachgrouptimetoinvestigatehowthedesignof
their hand drill might work.
* What is the shape made by the yellow
Flexi-rod edges?
* Which is longer, the yellow Flexi-rod edge or the
drill length?
* Double spiral.
• Eachgroupshouldhaveanopportunitytotrytheir
K’NEX hand drill mechanism by ‘drilling’ into a coffee
tin filled with polystyrene or table tennis balls.
* Some balls will be pushed up
and out of the tin.
* What happens to the balls?
The drill will work better if the coffee
tin is turned over to one side. When
‘drilling’ into the can, the balls are
pushed up and out of the can along
the drill bit’s spiral edge. The same
thing happens when a drill bit makes
a hole in wood. The waste materials
cut by the chisel-like tip are
channelled away along the screw
shaped grooves.
* Flexi-rod edges.
Education
®
43


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