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Posted on Jul 23, 2020
Vertical machining (also called milling) involves turning tools for removing metal from the workpiece. Vertical machining takes place on a vertical machining center that uses a vertical spindle. When using a vertically oriented spindle, the tool drops directly off the tool holder and often cuts across the top of the workpiece.
Although vertical machining centers vary in size and performance, manufacturers design each vertical machining center with quality, reliability, ease of use and safety in mind. In addition, thanks to on-demand production philosophy, modern vertical machining centers use the latest and most advanced milling technology to increase the efficiency and development of your business.
Vertical milling machines come in at least two main varieties. In revolver mills, the spindle is fixed in place; However, the mill bed can move and rotate. For smaller components, this provides a wide range of flexibility, especially for boring recesses in the workpiece, for example when making molds. Tower mills have a big disadvantage. Mounting larger elements on a rotating base will become impractical after some time. Tower mills usually perform best on smaller components when working in front and on the sides of the component.
For larger items, most stores turn into bed mills. In this construction, the workpiece is placed on a bed that can be fed along the axis. In some mills, the spindle can be raised or lowered or moved back and forth while the workpiece moves along the table. In other designs, the spindle is stationary, and the bed moves in one or more axes.
At first glance, horizontal and vertical milling machines look very similar, or at least they can look very similar. The only real difference is the cutting heads. Instead of a fixed spindle that rotates vertically, horizontal mills have one horizontal gazebo. The mandrel (a type of rod or shaft) is equipped with grinding wheels, which often resemble thick blades. In larger machines, many cutting heads can be mounted on one mandrel.
Like vertical mills, there is some flexibility in the beds themselves. Some mill beds move only along one axis, others can move on more than one axis. The greater the movement, the greater the flexibility - but increased movement slightly limits the size of the element being milled. Horizontal mills stand out in jobs that require multiple cuts (for example, parallel grooves) or in extremely hard materials.
:: Read more : Horizontal Milling Machines Basics
It is worth noting that most mills can be modified to perform any type of milling. With the help of appropriate adapters, the horizontal mill can be converted into a vertical mill and vice versa. This is especially important for smaller models more often used in small mechanical workshops or by hobbyists. Larger milling machines on an industrial scale may be slightly more difficult to convert.
Modern mills, both horizontal and vertical, can also be equipped with computer numerical control (CNC). This allows you to precisely cut and repeat operations, creating parts that are exact copies.
Horizontal and vertical mills have more similarities than differences, but in general vertical mills, especially tower mills, offer a slightly wider range of operations. However, for larger components and harder metals, horizontal mills provide higher cutting speeds and more power.
In the vertical mill, the spindle axis is oriented vertically. The milling cutters are held in the spindle and rotate around its axis. The spindle can be extended or the table can be raised / lowered, which has the same effect, allowing plunge cuts and drilling. There are two subcategories of vertical mills: bed mill and tower mill.
The revolver has a stationary spindle, and the table is moved both perpendicular and parallel to the spindle axis to make the cut. The most common example of this type is Bridgeport, described below. Tower mills often have a tongue that allows the knife to be raised and lowered in a similar way to a drill. This type of machine provides two vertical cutting methods: by raising or lowering blade and knee movement. However, in a table mill, the table only moves perpendicular to the spindle axis, while the spindle itself moves parallel to its axis.
The choice between vertical and horizontal spindle positioning in a milling machine design usually depends on the shape and size of the workpiece and the number of sides of the workpiece that require machining. Work in which the axial movement of the spindle is normal in relation to one plane, with the milling cutter being a milling cutter suitable for vertical milling machine in which the operator can stand in front of the machine and have easy access to the cutting operation by looking at it from above. That is why vertical mills are most favored to work in dies (machining the mold in a metal block).  Heavier and longer details are suitable for placing on a table in a horizontal mill.
Prior to numerical control, horizontal milling machines first evolved because they evolved by placing milling tables under turning heads. Vertical mills appeared in the next decades, and accessories in the form of additional heads for converting horizontal mills into vertical mills (and later vice versa) were widely used.
For production applications there are large, expensive milling machines with at least three computer-controlled axes. Some machines perform all operations, including automatic tool change. However, today there is an intermediate stage between a manual and a fully automated mill. This adds to your computer, digital readings and servomotors for the X axis and Y style mill in Bridgeport. This improved machine not only can tirelessly perform all its repetitive functions, but also added new possibilities. Now the mill can engrave (to drive the numbers and letters of the cutting tool in various sizes and fonts), cut out radii and angles without a turntable, create islands, pockets and cut out an ellipse and frame. Entering the position, diameter and number of holes automates the cutting of bolt holes; the system does math. The computer can also automatically compensate for the reduced diameter of sharpened knives, saving time and money.
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