The pitch Instrument is programmed to place the wire at the proper pitch to satisfy the design. It slides up and down the arbor, shifting along the sloped area. Shot Peening – Shot peening consists of impacting the surface area on the coiled spring with shot, modest round metal balls, https://typesofnerdscandy68888.bloggazzo.com/26919017/considerations-to-know-about-types-of-coil-springs