About the features of The Kamedake Soroban

The Kamedake Soroban has its unique features which distinguishes itself from the others.

Click to enlarge the image.

Concave on the Frames


M200

The upper and lower frames have smooth concave surfaces, so that you can hold the Soroban easily and naturally.

Nyurank

34100

On the upper and lower frame there are white spots. These are Entry (Nyurank) spots. For multiplication on the abacus, the most common mistake is said to be about the decimal point (the zero). The Nyurank spots are intended to help prevent these mistakes.
  • ・One-digit multiplication uses the upper-frame spot.
  • ・Two-digit multiplication uses the main center-bar spots.
  • ・Three-digit multiplication uses the lower-frame spot.


In that way decimal-point errors are avoided.

※ The Nyurank system is included in the most of the Risou-gata, Magnetto and Sorotop series sorobans.
※ In the Risou-gata soroban series, numbers 3435 and 1440 do not have the Nyurank points.


Jyuubako-gumi or Mortise & Tenon Joint

上下枠と左右枠は「重箱組み」という組み方で組んであります。

枠の材質:積層強化木

重箱組み用にホゾ加工をした枠材

枠の材質:積層強化木

枠材を組み合わせたところ

34100 枠の材質:アフリカ黒檀

実際に組み合わされたところ(表側)

34100 枠の材質:アフリカ黒檀

実際に組み合わされたところ(裏側)