MACHINE TOOL- Sec. B Unit 4 (Files) Questions and Answers Graded A+

MACHINE TOOL- Sec. B Unit 4 (Files) Questions and Answers Graded A+ How is a file identified? By its length, shape, cut, and coarseness. What are the 4 different cuts found on files? Single cut, double cut, curved cut, and rasp Brainpower Read More Previous Play Next Rewind 10 seconds Move forward 10 seconds Unmute 0:11 / 0:15 Full screen Name 4 coarseness designations for files. rough, coarse, bastard, second cut, smooth, and dead smooth. Which of the 2 kinds of files (single cut or double cut) is designed to remove more material? double cut file Why are the faces of most files slightly convex? To make it possible to file a flat surface by offsetting the tendency to rock a file. To compensate for the slight downward deflection when pressure is applied while filing. To concentrate pressure on fewer teeth for deeper penetration. What difference exists between a mill file and an equal-sized flat file? A mill file is thinner than a comparable-sized flat file. In what way does an American pattern file differ from a Swiss pattern file? Swiss pattern files are more precise in construction; they are more slender and have teeth to the extreme edges. What are the coarseness designations for needle files? Coarseness is identified by numbers from 00 (fine) to 6 (coarse) Why should files be stored so they do not touch each other? when files touch each other, teeth can break or become dull. What happens if too much pressure is applied when filing? Too much pressure will break teeth off a file. It will also cause pinning and scratching of the work surface. What causes a file to get dull? Files in contact with each other, files rubbing over the work without any pressure being applied, filing too fast, or filing on hardened materials causes files to dull. Why should a handle be used on a file? As a safety precaution; an unprotected tang can cause serious injury. Why should workpieces be measured often? Measuring the workpiece for flatness and size ensures that the filing is done in the right place and that the filing is stopped before a piece is undersize. Measuring often is not a waste of time. What happens when a surface being filed is touched with the hand or fingers? Touching a workpiece is just like lubricating the workpiece or the file so that it slips over the work without cutting. Also causes a file to dull quickly. How does the hardness of a workpiece affect the selection of a file? A soft workpiece requires a file with coarser teeth, because there is less resistance to tooth penetration. A fine-toothed file would clog up on soft materials. For harder materials use a fine-toothed file to have more teeth making smaller chips. How can rounded edges be avoided when a workpiece is draw filed? The draw-filing stroke should be short enough that the file never slips over the end of the workpiece. Care should be taken that no hollow surface is created through too short a stroke.