Abacus plans

The abacus, also called a counting frame, is one of oldest counting devices. It was developed about 5000 years ago, and it was used by all ancient civilizations. Abacus was used centuries before the adoption of modern numeral system. Abacus consists of wooden frame and rods or wires with freely sliding beads. The beads are usually rounded and made of hardwood or plastic. The beads are counted by moving them towards the rods. Depending of the origin, there are a few slightly different types of the abacus.
 
Abacus plans

 
Today, abacus is still sometimes used by kids for learning of basic math like add, subtract, multiply, and divide.
 

Chinese abacus


Chinese abacus

Chinese abacus - Parts list and assembly drawings
Chinese abacus plan

Chinese abacus - Part drawings
Chinese abacus - Part drawings


 

School abacus


School abacus

School abacus - Parts list and assembly drawing
School abacus plan

School abacus - 1. Side
School abacus - 1.Side

School abacus - Part drawings
School abacus - Part drawings

School abacus - Mirror part
School abacus - Mirror part

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Abacus plans (PDF) - 568Kb, 8 Pages