What is din 509?

What is din 509?

DIN 509: 1956-04, 1966-01, 1966-08. Dimensions in mm. 1 Scope and field of application. This standard specifies undercuts on turned parts and in bores, and gives details of the indication of undercuts on drawings.

How do you size an undercut?

A rule of thumb is that the undercut should be at least 1.5 threads long and the diameter should be at least 0.015 in (0.38 mm) smaller than the minor diameter of the thread. Strictly speaking the relief simply needs to be equal or slightly smaller than the minor diameter of the thread.

Is standard for relief groove?

NOTE — In practice the test is possible only through visual inspection. The designation of a relief groove is a combination of the word ‘Relief groove’, the standard number IS 3428, a hyphen; the shape and size of the relief groove (radius r, depth of cut t, separated by the symbol ‘x’).

Why is undercut needed?

Before a part can be coated, undercut pre-machining must be performed to remove any apparent erosion, corrosion, wear, and more. Many parts have existing damage and that’s why they’re being coated. In order for the repair process to be successful, undercutting to remove damage is required.

What is relief groove?

Relief Groove Definition: Clearance groove of specified form and dimensions created by removing material at an inner corner of a rotationally symmetric work piece and which is necessary for subsequent machining and assembly with mating parts.

What is thread relief?

Thread Relief, a radial reduction of the taps major and pitch diameters from the cutting edge to the heel. Relieving of the pitch diameter results in the minor diameter being relieved as well due to the manufacturing process whereas the major diameter is relieved separately.

What are thread reliefs?

What is undercut in PCB?

In PCB fabrication process, copper has to be removed from solid copper sheets for realizing conductive traces. The solution removes the exposed copper and the resist is also removed, then the height of the copper trace have material etched from them. This is called Undercut.

What is a stress groove?

A stress relief groove has been used for the improvement of fretting fatigue strength [1], [2], [3]. The most successful example for the application of stress relief groove is the railway wheelsets. The machining of a groove at the critical part of the railway axle results in 60% improvement of fatigue strength.

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