Pedders Suspension Coil Springs

The primary function of springs, whether they be Leaf, Coil or Torsion Bars, is to absorb the shocks that are created when driving across irregular road surfaces and to maintain the tyres contact with the road.
 
The spring rate, or stiffness, must be matched to the weight of the vehicle resting on it and the weight of the other suspension components and the wheel. Spring rate also controls roll stiffness, or body roll. By reducing the amount of body roll, we reduce the amount of wheel camber change. Large camber change can drastically reduce the tyre's contact with the road surface, severely limiting the handling potential during cornering.
 
The handling of most vehicles is substantially improved by increasing the original spring rate to an optimum rate which maximises tyre adhesion and reduces body roll for better handling. Increasing the spring rate beyond the optimum rate detracts from the handling potential as the tyres begin to skip over bumps, reducing grip and safety.
 

Coil Spring Design and manufacturing is a craft which requires strict adherence to a demanding series of procedures, all of which are critical to the performance of the final product.  Pedders undertakes the following key steps in relation to its Coil Spring Manufacturing Process:
 
Hot Coiling
Circulated Oil Quenching
Furnace Tempering
Shot Peening
Scragging
Loaded Height and Rate Testing +/- 1mm Tolerance
Powder Coating and Packaging
  
Pedders offers to its trade and retail customers four different branded coils spring ranges. These are as follows:

* Pedders Heavy Duty Coil Springs (standard and raised height replacement coil springs for passenger and light commercial vehicles)

* Pedders SportsRyder Coil Springs (premium range of lowered coil springs for sports and performance applications)

* Pedders Touring Springs are built to industry standards (thus less than Pedders premium SportsRyder range) and priced for the performance motorist on a budget.

* Pedders Trak Ryder Coils Springs (four wheel drive coil springs available in several height options for a variety of applications.)


All Springs are Not Created Equal

Pedders USA Suspension Camaro
Video: Birth of a Lowering Spring: Inside Pedders Suspension May 2, 2012 by Carter Jung


Pedders Suspension is a brand that might be familiar to enthusiasts of the domestic aftermarket. For more than six years, Pedders has offered suspension components for Chevy Camaros, Ford Mustangs and Pontiac GTOs. What most don’t know is that the company is far from an upstart in the chassis game. Pedders Suspension has been in business in their home country of Australia for over 60 years, starting back in the mid-1950s rebuilding shock absorbers.

Headquartered in Keysborough, just outside of Melbourne in the state of Victoria, Pedders Suspension has a unique business model for their domestic market. Their products are distributed solely through franchised Pedders Suspension retailers, of which there are over 130 in Australia. Think Jiffy Lube, but for suspension needs that range from the inspection and alignment all the way to polyurethane bushings and coilover swaps.

Here in the U.S., Pedders’ business model is completely different, utilizing a more traditional distribution route. In their short time in the American market, Pedders’ products have been used by GM, Lingenfelter and Saleen. Pedders sells the gamut of chassis components, including coilovers, polyurethane bushings and CV shafts, but their core product is springs. In fact, Pedders likes to refer to their manufacturing facility as the “World’s Best Spring Plant.” While that’s up for interpretation, having witnessed the birth of a spring, firsthand, we can attest that quality is very much at the core of their values.

Here’s how Pedders Suspension springs are made:


Step 1:Pedders’ springs begin life as steel from BlueScope Steel, an Aussie company headquartered in Melbourne. Instead of sourcing cheaper materials from China or India, Pedders insists upon using steel that is ISO accredited.
Pedders USA Suspension Camaro

Step 2:For heating of the metal rods, Pedders relies on gas instead of electricity. With the latter, dips and irregularity in power can cause inconsistencies in the metal. Each rod is baked close to 980 degrees C.
Pedders USA Suspension Camaro

Step 3:After the steel is heated up to temperature, the glowing rod is then coiled around a mandrel. The solid steel mandrel does not flex or bow with repetitive use. Pedders has more than 100 different steel mandrels in varying shapes and sizes for varying applications.
Pedders USA Suspension Camaro

Step 4:The next stage in the spring production is quenching, a process in which the hot coiled steel is cooled by oil. The spring is still soft at this point, lacking any memory.
Pedders USA Suspension Camaro

Step 5:Once the spring is cooled, it goes back into the tempering furnace where the coils are cured. Temperatures are adjusted to suit the gauge of the wire—the thicker, the hotter.
Pedders USA Suspension Camaro

Step 6:After another cooling phase, each spring is ground to appropriate size and fitment.
Pedders USA Suspension Camaro

Step 7:For the final step in strengthening the steel, each spring is shot peened with military grade shot.
Pedders USA Suspension Camaro

Step 8:Pedders scrags 100 percent of their springs. Scragging is a quality-control process where each spring is fully compressed, testing its load for up to 2 mm in variance.
Pedders USA Suspension Camaro

Step 9:Before they are boxed and shipped around the world, the springs are powder coated. Powder coating gives a spring its brand-distinctive color and protects it from the elements.
Pedders USA Suspension Camaro

Posted with the permission of R & T