CARE AND MAINTENANCE OF METAL WORK TOOLS
CONTENT- Care of Files
- Care of Hacksaw
- Care of Boring Tools
- Concept of and Need for Maintenance
- Types of Maintenance
Care of Files
(i) A file cuts the metal during the forward stroke; therefore pressure on the file should be released during the return stroke. (ii) A new file should be used for soft metals such as brass, zinc, or copper. It should not be used for filing welded joints or surface of casting. (iii) A file must not be used without a handle because it is dangerous. Make sure the handle is firmly secured. (iv) The file should be cleaned regularly with a wire brush or file card to remove iron filing embedded in the teeth of the file and enable the file to cut better.Care of Hacksaw
(i) Ensure the jobs are rigidly clamped to the vice. (ii) The blade should be fixed so that the teeth are pointing away from the handle. (iii) Tension the blade by the tensioning wing-nut making sure that the tension is right. Incorrect tension will lead to breakage of the blade. (iv) For solid copper or brass, use coarse blade about 14 to 18 teeth per 25mm for sheet metal and thin strip use teeth per 25mm. (v) Use moderate speed in cutting, about 40 to 60 strokes per minute. (vi) Use as much length of the blade as possible.Care of Boring Tools
You are viewing an excerpt of this lesson. Subscribing to the subject will give you access to the following:
- NEW: Download the entire term's content in MS Word document format (1-year plan only)
- The complete lesson note and evaluation questions for this topic
- The complete lessons for the subject and class (First Term, Second Term & Third Term)
- Media-rich, interactive and gamified content
- End-of-lesson objective questions with detailed explanations to force mastery of content
- Simulated termly preparatory examination questions
- Discussion boards on all lessons and subjects
- Guaranteed learning