Boring Operation On Lathe Machine Pdf
The work or the drill may revolve. These are preprogrammed subroutines that move the tool through successive passes of cut, retract, advance, cut again, retract again, return to the initial position, and so on.
Each process is chosen based on the requirements and parameter values of a particular application. From Wikipedia, the free encyclopedia.
In deep holes with tolerances this tight, the limiting factor is just as often the geometric constraint as the size constraint. Now customize the name of a clipboard to store your clips. Next, through holes are preferred over blind holes holes that do not traverse the thickness of the work piece.
For tapered holes, the cutting tool moves at an angle to the axis of rotation. SlideShare Explore Search You. Visibility Others can see my Clipboard.
The control systems can be computer-based, allowing for automation and increased consistency. Gun drilling and cannon boring are classic examples. Grinding, honing, and lapping are the recourse for when the limits of boring repeatability and accuracy have been met. When the cutting tool engages the workpiece, a chip is formed. For nontapered holes, the cutting tool moves parallel to the axis of rotation.
Geometries ranging from simple to extremely complex in a variety of diameters can be produced using boring applications. Boring is used to achieve greater accuracy of the diameter of a hole, sitstayfetch pdf and can be used to cut a tapered hole. Boring tool is held in the boring bar which has the shank.
Drilling and boring
Boring is one of the most basic lathe operations next to turning and drilling. For such parts, internal cylindrical grinding is a typical follow-up operation. Boring operations on small workpieces can be carried out on a lathe while larger workpieces are machined on boring mills. Lathe boring usually requires that the workpiece be held in the chuck and rotated.
As the workpiece is rotated, a boring bar with an insert attached to the tip of the bar is fed into an existing hole. The limitations of boring in terms of its geometric accuracy form, position and the hardness of the workpiece have been shrinking in recent decades as machining technology continues to advance. First developed to make the barrels of firearms and artillery, these machining techniques find wide use today for manufacturing in many industries.
These machines are operated at high speed and low feed. Boring machines come in a large variety of sizes and styles. The three-jaw chuck is used to hold round or hex workpieces because the work is automatically centered.
Depending on the type of tool used, the material, and the feed rate, the chip may be continuous or segmented. In other projects Wikimedia Commons.
Show related SlideShares at end. Nevertheless, technologies have been developed that produce deep holes with impressive accuracy. Clipping is a handy way to collect important slides you want to go back to later. Because of the factors just mentioned, deep-hole drilling and deep-hole boring are inherently challenging areas of practice that demand special tooling and techniques.
There are various types of boring. Collets combine self-centering chucking with low runout, but they involve higher costs. Several diameters can also be added to each shape hole if required.
The face plate is also used for irregular shapes. In other words, it may be easy to hold the diameter within. You just clipped your first slide!
The surface produced is called a bore. First, large length-to-bore-diameters are not preferred due to cutting tool deflection. In most cases they involve multiple cutting points, diametrically opposed, whose deflection forces cancel each other out. Cooling of the bores is done through a hollow passageway through the boring bar where coolant can flow freely. Successfully reported this slideshow.
At the end it makes countersinks in the work piece. Like cutting velocity or speed, the feed rate also needs varying within a range depending upon the tool-work materials and other conditions and requirements. You can change your ad preferences anytime. To produce a taper, the tool may be fed at an angle to the axis of rotation or both feed and axial motions may be concurrent. They also usually involve delivery of cutting fluid pumped under pressure through the tool to orifices near the cutting edges.
Tungsten-alloy disks are sealed in the bar to counteract vibration and chatter during boring. The dimensions between the piece and the tool bit can be changed about two axes to cut both vertically and horizontally into the internal surface. Sometimes a part may require higher accuracy of form and size than can be provided by boring. At the extreme, no perfection of machining or grinding may be enough when, despite the part being within tolerance when it is made, it warps out of tolerance in following days or months.
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