12/6/2023 0 Comments Flatness symbol gd&t![]() ![]() Lay is the term used to describe the dominant pattern on a surface and the orientation of that pattern. Figure 1 – Lay, Waviness, and Roughness Lay Roughness is the most commonly specified aspect of surface finish, however, before we get into the details Surface Roughness, let’s discuss these three elements that make up Surface Finish. However, it is not uncommon in machine shops for the term surface finish to be used to describe only surface roughness. Surface finish is composed of three distinct elements – roughness, lay, and waviness (See Figure 1 below). ASME also publishes the B41.6 Surface Texture Standard, which contains definitions and measurement methods for surface finish. The American Society of Mechanical Engineers (ASME) has published the Y14.36M Surface Texture Symbols standard, which illustrates the proper specification and use of surface texture symbols on technical drawings. Requirements for surface finish are frequently found on technical drawings for mechanical parts, particularly where parts fit together tightly, move against each other, or form a seal. Surface finish is the term used to describe the texture of a surface, and it is sometimes used interchangeably with the term surface texture. In this article, we will provide a broad overview and answer some of the most commonly asked questions… What is Surface Finish? ![]() Surface finish can be a confusing subject, especially when it comes to units or the difference between Ra and Rz. ![]()
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