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3.2 μm Ra is usually the standard surface finishing for machined parts. It is suitable for most consumer parts and sufficiently smooth, but it contains visible cut marks. It is the default surface roughness applied at Xometry unless otherwise specified. Smoother surfaces that are also usually achievable with CNC machining and offered by Xometry are 1.6 μm Ra, 0.8 μm Ra and 0.4 μm Ra.

SPIsurface finishstandard

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Stainless steelsurface finish

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Ra (average roughness) is the predominant parameter for measuring surface roughness due to its ease of use and broad applicability. This simplicity makes it ideal for various applications, such as ensuring the smoothness of automotive parts, medical devices, and optical components​.

No 4finish

The depth of focus is greatest on the lowest power objective. Each time you switch to a higher power, the depth of focus is reduced. Therefore a smaller part of the specimen is in focus at higher power. Again, this makes it easier to find an object on low power, and then switch to higher power after it is in focus. A common exercise to demonstrate depth of focus involves laying three different colored threads one on top of the other. As the observer focuses down, first the top thread comes into focus, then the middle one, and finally the bottom one. On higer power objectives one may go out of focus as another comes into focus.

The compound microscope is a useful tool for magnifying objects up to as much as 1000 times their normal size. Using the microscope takes lots of practice. Follow the procedures below both to get the best results and to avoid damaging the equipment.

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When drawing what you see under the microscope, follow the format shown below. It is important to include a figure label and a subject title above the image. The species name (and common name if there is one) and the magnification at which you were viewing the object should be written below the image. All relevant parts of the drawing should be labelled on the right side of the image using straight lines. Lines should not cross. Drawings should be done in pencil, while labels should be in pen or typed. Remember that total magnification is determined by multiplying the ocular x objective.

Surface finish

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While less common in modern practices, Rz (mean roughness depth) can be still found, especially in older technical drawings. This makes Rz particularly valuable for applications where extreme height variations impact performance, such as in sealing surfaces or components involved in sliding contacts.

Older drawings may use roughness grade numbers according to DIN ISO 1302. This standard divides the surface roughness into twelve grades. Each class from N1 to N2 represents a maximum permissible Ra value according to this standard.

N6surface finish

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Both Ra and Rz are typically measured using profilometers. These devices can be contact-based, where a stylus physically traces the surface, or non-contact, using optical or laser methods. Non-contact methods are preferred for delicate or high-precision surfaces as they avoid physical interference with the surface being measured.

Ra is the numerical average of the absolute values of the deviations of all the peaks and valleys from the mean line within the measurement length. It is also called the Center Line Average (CLA).

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The field of view is largest on the lowest power objective. When you switch to a higher power, the field of view closes in towards the center. You will see more of an object on low power. Therefore, it is best to find an object on low power, center it, and then switch to the next higher power and repeat.