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Machined springs used in torsion
Typically, torsional machined springs are a little longer than equivalent wire ones. These springs benefit from attachments, however, they differ from wire torsion springs in that the coil ID can be reduced to add stiffness to the torsional rate. Adding stiffness to wire torsional springs requires a change in the basic configuration, such as OD, ID, wire size, or number of coils, or a change in the wire shape. Wire is available in rectangular and trapezoidal sections. Trapezoidal sections are generally selected for smaller ID springs so that post wound sections will approach being rectangular.

حصارکشی یکی از نیازهای اساسی در دامداری است. با انتخاب صحیح گزینه‌های حصارکشی، می‌توان امنیت دام‌ها را تأمین کرده و از فرار آن‌ها جلوگیری کرد. در اینجا به بررسی گزینه‌های مختلف حصارکشی خواهیم پرداخت.