The forces acting on the SPDT spindle must be part of the capacity evaluation. That includes the weight of the fixture plate (or part-holding chuck), the weight and size of the part being turned, plus the force on the spindle during the cutting process.

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The electrical noise of the spindle’s motor can directly impact its performance. Known as “print-through,” it occurs when rotor magnets pass across the stator windings, creating loads that translate into motion errors.

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“Precision spindles can have upwards of 50 components in them, and the quality of every component will make or break the overall performance of the machine. What matters is a care for details throughout the whole build.” ~Chris Abbot, ABTech

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Diamond turning is a high-precision CNC turning process that uses a diamond-tipped cutting tool with a single point. Often called single point diamond turning (SPDT), it offers the sub-micron level of control required for optics manufacturing.

At ABTech, we have over 25 years of experience building (and integrating) precision air-bearing machines such as single-point diamond turning spindles. We build to order, working collaboratively with our customers to help them achieve their goals.

Do you build precision tools for the optics industry? Get the ABTech whitepaper, exploring what it takes to compete in a world of extreme accuracies.

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As technology advances, many manufacturers require tools with cutting-edge accuracy. Single point diamond turning (SPDT) is one of today's most precise CNC processes. Equipped with an air-bearing spindle, an SPDT machine can finish parts to an accuracy of less than a millionth of an inch.

With single-point diamond turning, it’s possible to finish an optical component to within a fraction of a wavelength of light. However, every aspect of the diamond turning process must be geared towards quality to sustain this level of accuracy.

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The most common SPDT machine is the lathe type, where the workpiece rotates, and the cutting tool translates. A flycutter-type machine has the cutting tool rotating while the workpiece translates.

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The size and geometries of the spindle’s rotating shaft and supporting journal contribute to the air bearing’s load capacity, stiffness, and accuracy. They each have individual part specs, as well as combined considerations. For example, designing a smaller air gap between the shaft and the journal adds stiffness but leaves scant room for movement error. And manufacturing the rotating shaft to tighter tolerances will result in superior spindle accuracy, with a trade-off of increased cost.

Any error in a spindle prints through into the final part, so let’s look at some of the major design aspects affecting quality:

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A diamond turning machine’s spindle includes its bearing, motor, encoder, and any fixturing, such as a collet assembly or machine tool chuck. What’s important is that all the parts work together to limit radial and axial error motions.

Similarly, hardware such as encoders and amplifiers can affect the spindle’s final output accuracy. It’s crucial to see the spindle as one piece of an interacting system rather than just looking at each individual part.

Aerostatic spindles (air-bearing spindles) use a layer of air to cushion the movement between two surfaces. Because there’s no contact (and almost no friction), an air bearing provides repeatable, smooth motion with the highest precision of any bearing technology available today.

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Definition noun (general) The condition of polarity (biology) The process or act of producing positive and negative electric charge values to opposite ends, such as the electrical charge inside a (nerve) cell relative to the surrounding environment Supplement Polarization in general context refers to the state or condition of polarity. In biology, polarization pertains to the act or process of producing a positive electrical charge and a negative electrical charge such that between a nerve cell internal electrical charge, which is negative, and the surrounding environment of a nerve cell, which is positive. The cell is able to regulate the differing electrical charge relative to its surrounding via the plasma membrane. A closer look at the plasma membrane reveals transmembrane proteins and pumps that act as ion channels. These proteins that are embedded in the plasma membrane are selective, which means they allow certain molecules to move in and out of the cell while prevent or control the efflux and influx of others (in this regard, ions). There are move negative ions (e.g. Cl–) inside the cell, which results in a cell that is negative relative to the outside. In general, a nerve cell has a resting potential of approximately -70 mV.1 Word origin: French polarisation Variant(s):

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Definition noun (general) The condition of polarity (biology) The process or act of producing positive and negative electric charge values to opposite ends, such as the electrical charge inside a (nerve) cell relative to the surrounding environment Supplement Polarization in general context refers to the state or condition of polarity. In biology, polarization pertains to..Read More

For instance, environmental control is a must because even minor temperature fluctuations can expand or shrink the size of the part (or the SPDT machine itself), impacting the final product. Likewise, an isolated foundation is required to block out floor vibrations.