![]() ![]() The dynamics of an ultra‐precision machine tool determines the precision of the machined surface. In this technology, three pairs of spherical supports are adopted, two in the right side and one in the left side, forming an isosceles triangle distribution, by re- vising the screws to align the spindle axis to the horizontal- slide. Furthermore, a novel technology is used to ensure that the axis of the spindle is perpendicular to the workpiece, as shown in Fig. The structure of the machine tool consists of a machine tool bed, a column, adjustment pads, spherical pads, and a beam. Both of them improve the stiffness of the sensitive direction in machining. The hydrostatic bearings are also employed in the horizontal axis slide to improve the stiffness. A large support surface is used to improve the axial stiffness. The aerostatic bearings are used in the vertical-axis spindle due to its inherent advantages of high positioning accuracy and smoothness of motion. The surface to be machined lies in a horizontal plane. Mounted to the horizontal slide is a vacuum chuck which fixes the workpiece by vacuum power. A bridge supports a vertical-axis spindle and flycutter over a horizontal-axis slide. configuration of the flycutting machine is shown in Fig. Your log cookie is now ready to be incorporated into a project. ![]() If you don’t have one, you can sand it smooth with a belt sander and random orbit sander. You’ll need to create a new toolpath with a smaller depth of cut.Ī drum sander is perfect for cleaning up the router marks. When one face is flat flip the workpiece over and level the opposite face. You can do other things in the shop while the cutter removes material and finds its way down to a point where it’s cutting a uniform surface. You’ll find that the cutter makes contact on parts of the surface, but misses other parts, because of the thickness discrepancy. Instead, zero the Z axis using paper as a feeler gauge between the cutter and workpiece. On thick items, like this piece of burr oak, you may not have enough room to fit the Z zero puck on top of the workpiece and below the cutter. Secure the cookie to your CNC and mount a fly-cutting bit in the collet. This is the same design process you’d follow for fly cutting, but in this case, there’s a significantly greater Cut Depth. There’s lots of material to remove on this cookie, so will likely need several passes.Ĭheck Ramp Plunge Moves and click Calculate. The Cut Depth should be equal to or slightly more than the difference between the high side and low side of the item you’re leveling. Even though the cookie is nearly round, it’s fine to create a square workpiece.Ĭreate a circle that’s slightly larger than your cookie.Ĭhoose the end mill you’ll use (more on fly cutting end mills in the fly cutting article) and set the Cut Depth. Start a new job and enter the dimensions of the cookie as the Job Size. On this cookie, there’s a 1-9/16” difference between the high side and the low side. You need to know the difference between the two. Measure the thickness in a few different spots. ![]() Do this in a couple of spots, looking for the largest dimension. After you understand those things, then you’re ready to dive in.įirst, grab some measurements. Measure the item you’re going to fly cut. Your CNC router is the choice that provides a great way to deal with this issue. Before diving into this article you should understand how to fly cut, and you should also have a basic understanding of log cookies and how to secure them on your CNC. Would you use a planer? Not recommended because you shouldn’t plane end grain. Would you sand it to uniform thickness? No thanks. This burr oak cookie is over 1” thicker on one side than on the other. Fly cutting is a very important maintenance task that you need to do, but it can be used for more than just leveling your spoilboard. ![]()
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