Introduction: How to Make Your Mini "Crank Shaft"

Picture of How to Make Your Mini "Crank Shaft"

This an instructable on how to make a mini crank shaft for two pistons.

The crankshaft is the part of an engine which translates reciprocating linear piston motion into rotation. To convert the reciprocating motion into rotation, the crankshaft has "crank throws" or "crankpins", additional bearing surfaces whose axis is offset from that of the crank, to which the "big ends" of the connecting rods from each cylinder attach.

Materials required

1.cycle fork

Tools required

1.cutting plier
2.wire stripper

Step 1: Schematic of the Crank Shaft

Picture of Schematic of the Crank Shaft

Here is the schematic of the crank shaft 

Step 2: Bending the Cycle Fork

Picture of Bending the Cycle Fork

Here i will show how to bend the cycle fork :
first bend.............

Step 3:

Picture of

the second bend.....

Step 4:

Picture of

third bend...........................


lemonie (author)2010-09-20

This doesn't look right, particularly the diagram with arrows on it.
Could you add a diagram / picture with pistons and bearings?


rimar2000 (author)2010-09-20

I think you need a guide tool to make an acceptable crank. You can make the guide easily in wood, plastic, aluminum, etc. Basically, the main axis would be a groove with cuttings for the crank curves.

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