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rocktactics.com

What are relief cuts?

We occasionally get this question from customers, who want to know what relief cuts are, and why we use them. It's simple. Relief cuts are designed to get your mounting surfaces, as tight as possible.

 

 

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As you can see in the picture above, relief cuts are laser cut in to the bent edges, prior to forming the shape of the component (in the above example, spring perches). If the bent edge were to remain un-cut, then the top of the axle cut out, would "flare" out, and you would not get nearly as tight a fit to the top of the axle housing.

The other way to avoid flaring of the top of the axle cut out is to add more space between the top of the axle cut, and the mounting surface of the item. But this creates a new problem. You are now adding un-usable lift to the bracket. In the case of spring perches, this can contribute to axle wrap, and it can add un-necessary lift the vehicle. Ideally when you add a component to your suspension, you want to be able to gain some benefit from it such as more travel, and more stability. When you add longer brackets, you lift the vehicle higher, without gaining any more usable suspension.

 

Our components are designed to give you the best performance, right out of the box. Because of that, we have designed many of our products to have relief cuts in the bent edges. These relief cuts are designed to help the bracket sit closer to the surface it is being welded to. Our relief cuts require the following:

- All relief cuts will need to be professionally welded in, prior to installation.

- If your components come with box plates, they too will need to be professionally welded on, prior to installation.

- At no time should any part of the weld be present between mating surfaces.

An example of weld that sits between mating surfaces, would be our spring over leaf spring perches. If after welding the relief cuts in, there is any weld present above the top of the spring perch, your leaf springs will be resting on the weld as opposed to the spring perch. This can cause a stress riser on the perch, as well as a stress point on the bottom of the leaf spring. It can also lead to loose suspension components if the weld should happen to break off, crumble, crack, or in any other way break down. This would relieve the tension on your U-bolts, and cause an un-safe condition.

 

For these reasons, we tell our customers to make sure that ALL relief cuts are professionally welded in, PRIOR to installing our components on to the vehicle. If you have any questions, you may feel free to give us a call or E-mail us, and we will be happy to answer any questions you might have.