Ragged Technology: Wire drill and Pump drill
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Description
I made a cord drill and then upgraded it to a pump drill. A cord drill is basically a spindle with a fly wheel attached so it looks like a spinning top. the middle of a piece of cord is then put into a notch at the top of the spindle. The ends of the cord are then wrapped around the spindle and then pulled quickly outwards causing the drill to spin. The momentum of the fly wheel causes the cord to wrap back around the spindle in the other direction. When it stops the cords are pulled outwards again and the drill spins in the other direction.
I made the first one with a stone flywheel then made fire with it in the same way I make fire with fire sticks. Then I made and fired some clay fly wheels, made another drill with one of the fly wheels and fitted a stone drill bit to the end. This one I use for drilling holes in wood.
I used the new drill to make a hole in a piece of wood. I then put the spindle of the original cord drill through the hole in the wood, tied the ends of the cord onto the piece of wood and it became a pump drill. The cords were wrapped round the spindle as normal but now a pumping action of the wooden cross bar created the same action.
This was an interesting project. For fire making I"d stick to fire sticks because the equipment is easier to make. But for people with soft hands they could use the cord drill as it won"t give them blisters. It should be added that the pump drill actually took longer than the cord drill (cord: 32 seconds, pump 1 min 30 seconds -the pump drill scene was edited down to make it watchable). The pump drill had more moving parts and was constantly having problems. As a fire making method I"d choose the cord drill over the pump drill unless all the parts were well made.
The main purpose I"d use these tool for is drilling holes rather than fire making. It was reasonably good but the stone bits I made could be improved and their attachment to the shaft also needs some thought. If the bit loosens and gets off axis slightly the whole thing wobbles.
These drills are impressive inventions and show potential for carpentry use later on.
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Transcription
Using the fire sticks to make fire this method can gives you blisters a round stone Drilling a hole in it with a stone awl Pecking a hole with the stone awl Pecking hole from other side Hole gouged right through Quartz sand added to help drilling process.
Spindle stick (Abroma mollis) Fitting stone over the spindle Fibrous tree bark separating the inner bark frome outer bark splitting the inner bark into thinner strips Twist the individual strands clockwise, but twist them together anti clockwise. This prevents the cord from unravelling carving a notch in the stick Tying the cord onto the notch with a strip of bark As the strings are pulled out wards, the spindle spins. When the strings are completely unraveled, the stones momentum wraps them back around the stick and the process is repeated in the opposite direction.
A coal has been produced Clay from creek bank Picking out rocks and sticks from the clay Ash from the fire Putting ash on stone to prevent clay from sticking Forming clay disc Putting a hole in 6 discs Drying by the fire.
Firing the disks Fanning the flames Glowing red hot Shaving bark off stick Fitting disk onto shaft Carving notch onto shaft Making stone drill bit Splitting shaft Lashing bit into shaft.
Fitting disc onto shaft Tying cord to notch Drilling hole in wood A thinner drill bit Hole carved through wood Fitting crossbar over shaft Tying the ends of the crossbar onto the drill Now the bar is used in a pumping motion to pull the strings outward instead of using the hands (avoids blisters from holding cords) Pump drill and cord drill.
Infomation
Author: Author Link: Youtube Link: https://www.youtube.com/watch?v=ZEl-Y1NvBVI Category: Channel Name: Primitive Technology Channel ID: 22 Tags: drill,primitive,cord,Pump drill,Cord drill,Friction fire making,Stone tools,Primitive Technology,pt,
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