Optical components

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Used to indicate that processes such as injection moulding, cold finishing, die casting, casting, forging, hot finishing or powder metallurgy must be used to acquire your desired surface finish. A black circle is added to the basic surface texture symbol to denote this.

Understanding surface finish symbols is vital in ensuring the success of any component outlined within an engineering drawing.

Edmund Optics

Aluminium extrusion is ideal for both single prototypes and large-scale production, offering bespoke, high-standard, consistent cross-sectional profiles.

Applicable when a surface is produced via any possible method, excluding when a bar or circle is specified or a method is specified above the horizontal line.

Newport

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Optical lenses

The creases made by the edged tool during machining are parallel to the surface captured in the diagram in which the symbol is written.

Our 3D printing solutions cater to personalised needs with a diverse range of materials and colour options, perfect for intricate plastic components and small batches.

To denote different surface finishes within different components, a list of surface finish symbols is required to reference contrasting finishes in a universally understood way. See below for a full list of all surface finish symbols, their meaning, and how they should be applied:

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Minor irregularities in the geometry of a component’s surface. Many engineer’s who reference surface finish will be referring exclusively to surface roughness, as this is the category most commonly measured. We go into more depth on what surface roughness means in our Surface Roughness Explained resource.

An edged tool is used during machining to create creases forming mostly a radial pattern in relation to the centre of the surface on which the symbol is written.

An edged tool is used during machining to create creases in the form of concentric circles in relation to the centre of the surface upon which the symbol is denoted.

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Produced by the manufacturing process undertaken to manufacture the component in question, lat is the dominant pattern of a part’s surface. It can be either parallel, perpendicular, circular, isotropic, multi-directional, or cross-hatched.

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With many years of experience, sheet metal parts can be a great low-cost option for certain high and low-volume applications.

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Choose our CNC Turning services for circular cross sections. We also offer Turn & Mill capabilities for more complex turned parts.

An edged tool is used during machining to create creases parallel with the surface in the diagram in which the symbol is written.

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Get It Made was founded in 2011 with a mission to make manufacturing simple. Based in London, UK, Get It Made provides outstanding manufacturing services to companies across the globe.

An edged tool is used during machining to create creases at an angle to the plane of projection, crossing one another on the surface on which the symbol is written.

Any method may be employed to produce the desired surface unless the circle or bar are specified, as illustrated within the symbols below.

Optics company

Thorlabs

Optimised for mass production of plastic items, our services in Plastic Injection Moulding are backed by deep expertise and industry-leading knowledge.

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This symbol indicates that material removal by machining is necessary for the desired surface finish to be achieved. A horizontal black bar is added to the basic surface texture symbol to indicate this.

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Surface finish refers to a surface’s texture. A vital component in ensuring the successful creation of manufactured parts, surface finishes are outlined within engineering drawings to ensure that parts fit together tightly. For example, for a seal to be airtight, parts manufactured must have compatible surface finishes to prevent the occurrence of any friction or damage between the multiple surfaces.

The title is given to imperfections within the surface of a component, often caused by warping due to excessive heating and cooling, and machining defects such as those caused by chatter. Waviness is measured over an evaluation length, with waviness spacing a calculation of the peak-to-peak spacing of waves, with the average height meanwhile defined by average waviness.