Boar spear «Morse Taper» by Andrey Grachev

[makandr]

Boar spear «Morse Taper»

№ 001

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№ 003


The assigned task: a finishing dagger easy to assemble on a pole, turning the dagger into a spear.
To avoid any discussion about the task itself and its practical application I have to make the following statement:
1. The task was set by a hunter who hunts wild boars with arbalest
2. The master is not a hunter, he doesn’t know how to kill animals
3. And sorry for using not finally processed parts and units in illustrations
Ideas to use bolted joint or bayonet mount were declined as uninteresting ones.
The master did want to implement an old idea to use a method of mechanical attachment of machine taper (Morse taper) type.
The boar spear is a modular item consisting of the three main parts:
1. Dagger
2. Dagger sheath
3. Staff that serves as pole of the spear.
The item is complemented with a dagger waist-belt.

Assembling method was adopted from a widespread system for securing cutting tools or toolholders in the spindle of a machine tool or power tool - Morse taper. In that system a male member of conical form fits into the female socket, which has a matching taper of equal angle. Two parts reliably fix to each other due to dry friction and wedging effect. Thanks to this, the item can be assembled in a moment. But at the same time disassembling of such system requires additional equipment (remember how it’s realized in different machines). In this spear this problem is solved with a pushing out lever.
Overall dimensions:

№ 004



Component parts of the item:

№ 005

№ 007

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The pole of the item is equipped with two stop collars and zones of rhombic notches. The stop collars are collapsible, each of them composed of two half-rings set in a groove on the pole and connected to each other with coupling screws:

№ 009

 

[makandr]

№ 010
The pole is made of Canadian walnut. The blank is glued of two halves.
The lower tip is set on the poled and fixed with buckle.

№ 011
The dagger sheath is wooden with metal tips and iron ring. It is leather-wrapped and equipped with a lock with safety. In addition to fixation of the dagger in the sheath, this let to use the sheath for assembling of the dagger in the holder of the pole (with gloves the assembling can be done without sheath).
Component parts of the sheath lock:

№ 012

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№ 017

 

[makandr]

№ 018

№ 019

The dagger is an all-metal item with necessary grooves and milling for nesting of component parts and hardware:
- Two halves of crosshair connected to each other with assembly screwed balls;
- Four wood segments of the handle with rhombic notches;
- Big and small rings (both composed of two half-rings) that serve to assembly segments of the handle on the dagger. These rings are the male member of the Morse taper.
The dagger made all-metal in line with the request of the customer to make it more solid.

№ 020

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№ 025

 

[makandr]

№ 026

The power bushing of the Morse taper is set on the pole. This element holds all major mechanisms: lever, safety, mechanism of folding-fixation of the lid. The lid was added to protect cavity of the bushing from dust.
The lever is used to fix-open the lid and to disassemble the Morse taper. The lever is equipped with opposing spring, return piston, adjustment screw (adjusts dagger pushing out torgue), case of the opposing spring, clamp of the body, safety tooth for reserving fixation of the dagger in the bushing and service devices.
The lever safety is composed of body, spring, lever of the safety and catch.
The lid has a mechanism that let it open and lock in open position automatically.

№ 027

№ 028





Lid pusher and lock.
The lid spring is powerful enough to initiate momentum sufficient to put the lid on lock in inverted position of the spear. In order to open the lid it’s necessary to unlock the spear lever and pull. The lid unlocks from its close position because of the momentum generated with the lid spring, rotates around its axis and fixes with catch.
The pusher of the lid and the catch are operated with the same spring. It’s shown on the drawings.
To close the lid it’s necessary to push the catch key located in the bottom part of the spear body. When the lid is unlocked it should be closed manually. With this the lid clamps around the pusher and brings it to its operating position.

№ 029

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№ 033

 

[makandr]

№ 034

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[devieduran]

its so complicated for me but i think it even can kill a wild boar

 

[makandr]

№ 042
Use of the lever for disassembly of the Morse taper
In order to extract the dagger from the bushing it’s necessary to unlock the lever from the safety and pull it. The lever pusher that is set on its axis pushes the dagger pommel and easily pushes the dagger out of the bushing.
As it can be seen from the drawings a safety tooth reserves fixation of the dagger in the bushing. When the safety is locked, the dagger can’t fall out of the bushing in any case.

№ 043

№ 044










Operation of the safety lever
The safety is rotated and equipped with a backlash spring. The spring is permanently applying efforts to put the lever in the down position. This generates two nice “clicks”.

№ 045

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№ 049
The dagger, the bushing and its components, the lid and its mechanism, and all parts used for assembling and holding on elements of the dagger and the bushing are made of 95x18 steel (similar to A473 (440C)). The blade and elements of the locks are file-hard. Hardware of the sheath and the sheath lock are made of steel similar to SA-283 C (?). The locking rod of the sheath lock is made of file-hard steel similar to D2.
The dagger waist-belt is made of leather reinforced with a profiled plate of steel.

 

[SharpByCoop]

Gives great importance and credibility to the phrase: "Meanwhile in Russia..." :thumbup:

Just WOW! The industrial Age is alive and well in Andrey's mind. Brilliant mechanisms and concept.

So very cool. Thanks for the lengthy and informative post.

Jim

 

[i4Marc]

Simpler methods of attachment are available but this is so much more interesting. Fascinating stuff. Thank you for sharing it.

 

[Patrice Lemée]

Love this stuff! Thanks for sharing. :thumbup:

 

[makandr]

Thank you! I will give Andrei your words.

 

[Lorien]

this is truly an incredible creation! Wow!!!

 

[DEllis]

this is truly an incredible creation! Wow!!!

My thoughts precisely! I am gobsmacked!

Darcy

 

[Bigfattyt]

Is this not a recreation of an historical spear?

I remember your post some time ago with the crazy bear spear.


makandr, what the heck do you do for a living?

I see your massive collection of knives. Picks of you around the world finding more knives! And you make knives too.


You are like the James Bond of knives, combined with Q!

 

[stezann]

Wow, Andrei is a great master!!
I like also very much the surface finish of the steel, i would ask how it is achieved. It looks like carbides network emerging from the matrix...beautiful.

 

[abbydaddy]

That is a pretty amazing thing. Every part of the boar spear is visually interesting and intricate. It almost seems like something one would see in a movie. It has a kind of steampunk feel, like it is from the future and the past at the same time.

 

[Meier66]

Amazing...lost for words. WOW.

 

[SBranson]

Absolutely amazing in concept and realization. It's a joy to follow this thread and see the complexity for it's own sake.
Just fantastic.

 

[makandr]

http://www.bladeforums.com/forums/s...inskiy-Shihmatov-Author-Andrey-Grachev-Russia

 

[BladeScout]

You post some interesting projects. Great stuff.