D/dの大きいばね（ここでは、線径0.6mm、外径20mm）の精度は難しい課題です。ここでは、CG06Cでの２本曲げと１本曲げ両方の動画をご覧頂けます。どちらがいいかの是非は決められませんが、D/dが大きい場合は、真円度を出すために、ワイヤーを支える点を多くする必要がありますが、１本曲げ動画では、ピッチツールをリコイルピン的に使う工夫を行っています。

Accuracy of springs with large spring index (here, wire diameter 0.6 mm(.024″), outer diameter 20 mm(.787″)) is a difficult issue. You can watch videos of both two-point & one-point coiling with CG06C. Which method is better can’t be decided. When Index is large, it is necessary to have more points to support wire in order to achieve good roundness. In this one-point coiling video, the pitch tool is used also as a recoil pin.