By P.Arthur Reynolds
ISBN-10: 8176222046
ISBN-13: 9788176222044
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Example text
Heat to a cherry red and plunge into water. This, incidentally, is opposite to the annealing of steel, for sudden cooling makes steel brittle. Steel is softened by heating, then allowing it to cool slowly. Loose Nuts One trouble frequently encountered with farm machinery is that nuts work loose, bolts wobble in their holes and the thread becomes so damaged that the nut cannot be screwed down tight again. An excellent tool for re-forming these threads has recently been put on the market. It comprises two hard steel plates, hinged at one end and threads tapped in a row along the join.
18) is a cap nut. When this is removed the main jet adjusting screw is exposed. To alter the mixture strength slacken back the lock-nut and turn the screw inwards to weaken the mixture and outwards to enrich it. If the original setting has been disturbed, or the needle has been removed to clear a choked jet, it is best to slacken the lock-nut well down the thread and then turn the screw clockwise as far as it will go. This closes the jet completely. Do this carefully and without using force or the needle might be damaged.
Apply a fair pressure, but not too much on thin drills or they will break. If you are using a hand drill, turn the handle as fast as you can, for most of the drills sold today are of the high speed variety. Be careful not to alter the angle once the drill has entered the metal, and keep just enough pressure to get a good cut. The life of a drill will be lengthened and the work of cutting made easier if a lubricant is used. For aluminium apply paraffin; for copper, mild steel, wrought iron and malleable iron use soapy water.
Maintenance of Horticultural Equipment by P.Arthur Reynolds
by Kenneth
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