How Spindles Determines Your Machining Quality

Posted on Oct 23, 2019

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In the machine tool sector, there are a very wide variety of spindle designs that is structures specifically for different kinds of processing demands. Spindle In the machine tool sector, a spindle is a rotating axis of the machinery, which often has a shaft at its center. The shaft itself is called a spindle, but also, on the market, the word often is used to refer to the entire rotary unit, including not only the shaft itself, but its bearings and anything attached to it.

Types Of Machining Center Spindle. A Brief Intro To Machining Center Spindle

Machining Center Spindle

In the machine tool sector, there are a very wide variety of spindle designs that is structures specifically for different kinds of processing demands. Spindle In the machine tool sector, a spindle is a rotating axis of the machinery, which often has a shaft at its center. The shaft itself is called a spindle, but also, on the market, the word often is used to refer to the entire rotary unit, including not only the shaft itself, but its bearings and anything attached to it.

There are many different kind of spindles that can be installed onto the machining centers and here are some of the popular model introduced as below:

Direct drive spindle

With simple structure, fast fabrication with machineries, the direct drive spindles are installed onto heavy duty machining centers such as some double column models. With the high precision, low vibration, same interface, and easy exchange features, machining centers are hence convenient to be maintained.

Direct drive model of spindles are with lower manufacture cost as well as fabrication cost (or say, assembly cost). Direct drive spindle can reach to the level of high speed easily, making high speed within a comparatively short period of time together with good dynamic rotary accuracy.

Belt drive spindle

For machineries demanding for radial and axle with higher rigidity and higher dynamic rotary accuracy, belt drive spindle is an optimum option. Many belt drive spindles are applied to machining centers for multi-task purposes due to its high repairmen feature that allows for subtle modifications.

Motorized spindle

Motorized spindle can reach high speed easily, and can balance adjustment within G1 and low vibration. Since it can be modularize easily, the manufacturing model setting becomes much more easily for the machining center producer in a way and onsite operators can conduct many modularized procedure based on the blueprint.

Most motorized spindle is noiseless, and with high thermal stability. Though the spindle is with small volume, it’s built with high power for small space installation. Therefore, it is also called built-in spindle as it can usually be installed inside the comparatively small spindle case shell on the machining centers. As the market demands for, motorized spindles are designed with high dynamic rotary accuracy, so it is assuring to manufacturers to perform accurate cutting as well as boring with the machining centers that is installed with the motorized spindles.

Besides, the motorized spindles are also called electric spindle due to the power source that it is attached and relied on. Normally speaking, built-in spindles are the most widely applied spindle models on the machining centers in the industrial sector due to the very characteristics.

Gear spindle

For those who pursue lower productive cost, gear spindle is a choice. It is made with lower manufacturing cost and can be repaired easily. However, it contains high torque transmission features that make this kind of spindles not to be neglected by manufacturers who pursue compact manufacture.

At the same time, gear spindle is designed with stable machinery functionality because the composition is relatively simple, so it can allow for high efficient of cutting which would be much more complicated if conducted by other types of spindle models.

Multi-spindles on a machining center

On the other hand, a machine tool may have several spindles rather than just one spindle, such as the headstock and tailstock spindles on a bench lathe (turning centers). In this concept, the main spindle is usually the biggest one among all the other spindle items within the machinery.

When industrial insiders give the references to the spindle without further verbal qualification, it would imply the main spindle. Some machine tools that specialize in high-volume massive production have a group of 4, 6, or even more main spindles on a machine tools. These machine models are called multi-spindle machines.

Gang drill center

For example, gang drilling machines and many screw making machines are designed with multi-spindle composition that allows for much different kind of spindles to perform.

However, such estimation scale is not always the same. Say, for instance, although a bench lathe (bench turning center) has more than one spindle (If the tailstock is also considered), it is not called a multi-spindle machine; it has one main spindle and the rest are not counted due to other scale specific reasons that is supposed to be on the X axis for the machining.

To sum up, machining center spindles may be of many types but the main purpose is to conduct machining on the rotating head. Be it multiple spindle or single spindle, if such a spindle can be installed onto machining centers properly for machining tasks, even if the driving mechanism is different, the main purpose is always the same.

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