![]() ![]() The part cannot be placed into a collet or chuck when cutting on the entire outside diameter of the stock.Ģ. Some parts may be irregular, calling for specialized tools to hold them properly before being machined.ġ. For better finishes, use a finnier grit abrasive cloth. When polishing in a Lathe, the following safety should be observed:įor normal finishes, use 80 to 100 grit abrasive cloth. Move the cloth slowly back and forth along the workpiece. With the right hand, press the cloth firmly on the work while tightly holding the other end of the abrasive cloth with the left hand.Ĩ. Hold the abrasive cloth on the workpiece.ħ. Set the lathe to run on high speed (about 800-1000 rpm).Ħ. Select the collect type and grade of abrasive cloth, for the finish desired, use a piece about 6 to 8 inch long and 1 inch wide.Ģ. Polishing in a LatheĪfter the workpiece has been filed, the finish may be improved by polishing with abrasive cloth.ġ. Rub a little chalk into the file teeth to prevent clogging and facilitate cleaning. Clean the file frequently with a file brush.Do not apply too much pressure to the file.Do not use a file without a properly fitted handle.When filing in a lathe, the following safety should be observed. Move the file about half the width of the file for each stroke and continue filing, using 30 to 40 strokes per minute until the surface is finished. Apply light pressure and push the file forward to its full length. Grasp the file handle in the left hand and support the file point with the right hand finger.Ĩ. Move the carriage as far to the right side as possible and remove the tool post (if needed)Ĥ. Mount the workpiece in the chuck, lubricate, and adjust the dead center in the workpiece.ģ. Set the spindle speed to about twice that used for turning.Ģ. Hold the file handle in the left hand to avoid injury when filing on the lathe, so that the arms and hands can be kept clear of the revolving chuck.ġ. 003 inch of size, if the surface is to be filed. Workpiece should always be turned to about. ![]() Filing in a LatheĪ workpiece should be filled in a lathe only to remove a small amount of stock, to remove burns or round off sharp corners. (40 to 60 rpm) and plenty of cutting fluid.ħ. Note: the workpiece will rotate when tapping using the lathe power. Set the lathe to the proper speed and drill with the tap to the required depth. Select the proper tap drill for the tap to be used.ĥ. When choosing a tap size, this chart is the first place to look. When choosing a tap size, this chart is the first place to look Hand Tapping Procedure Whenever the bit or tap is backed out, remove as many chips as possible and add oil to the surface between the drill or tap and the workpiece. Rotating the handle a full turn then back a half turn is common practice. Peck drilling involves drilling partway through a part, then retracting it to remove chips, simultaneously allowing the piece to cool. Pecking helps ensure that bits don’t overheat and break when using them to drill or tap. It keeps the bits from squealing, makes the cut smoother, cleans out the chips, and keeps the drill and stock from overheating. When drilling and tapping, it is crucial to use oil. When manually aligning a tap, be careful, as a 90° tap guide is much more accurate than the human eye. When using the lathe or the mill, the tap is already straight and centered. Tap guides are an integral part in making a usable and straight tap. Regardless of the method, the hole must be drilled with the proper size tap drill and chamferred at the end. Tapping can be done on the lathe by power feed or by hand. Tapping is the process of cutting a thread inside a hole so that a cap screw or bolt can be threaded into the hole. After completing this unit, you should be able to:
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