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TEN SHILLINGS WEEKLY is paid for the best communication received,

31st July 1913, Page 25
31st July 1913
Page 25
Page 25, 31st July 1913 — TEN SHILLINGS WEEKLY is paid for the best communication received,
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and one penny a line of ten words for anything else published, with an allowance for photographs.

Send us an account of any .special incident of your work or experience. If suitable, we will edit your nole.s, supply a sketch when required, and pay you for everything Published. Mentionyour employer's name, is confidence, as evidence of good faith. Address to The Editor, THE COMMERCIAL MOTOR, Rosebery .4 venue. London, E.G.

An Ingenious Drawdog Improvement.

The sender of the following communication has been awarded the 10s. prize this week.

[12961" C.B." (East Ham) writes :—" Many of your readers must have experienced trouble from time to time, owing to the want of a suitable tool for drawing off engine timing-wheels, etc. It is quite possible that the wheel to be withdrawn is of the skeleton type, having delicate vanes or spokes. An ordinary drawdog which only takes a grip at two points on the rim of the wheel will, in all probability, buckle and throw it out of shape before releasing it from the cone of the shaft. The dog, of which I send you a sketch— [We have had this redrawn.—En.]--will do the work without harming the wheel, as it gives an evenpowered pull at four separate points of the rim when required. This is done by inserting two three-quarter pins through the arms of the top on which the wheel can be placed. "Where the wheels are solid, and will stand a little more strain, the other end of the dog, with the bentover lees is used in the ordinary way. Some wheels have drilled and tapped holes put in by the manufacturers, and in this case the reversible dog can be used equally well. When this tool is taken adrift, it occupies very little room in the tool kit."

Renovating Files.

112971 " C.B." (Elthorpe Road) writes :—" Perhaps the following method of renovating files may help one or two readers. First of all clean the old files with a wire brush, and then dip them into a solution consisting of one part of nitric acid. with three parts of sulphuric acid, and seven parts of water. They should be left in this solution for a short time, according to the coarseness or fineness of as file, and then taken out and well washed in clean water. Next they should be dipped into milk of lime, and this should also be washed off, and the files then carefully dried. Then equal parts of olive oil and turpentine should be rubbed on and the files should be finally brushed over with finely-powdered coke. "I would add one word of warning, and that is that great care should be taken when mixing the nitric and sulphuric acids and the water. The acids should be placed in an earthenware jar and the water poured in. This process should not be reversed, unless the sulphuric acid be very 1 oily.' "

A Gudgeon-pin Withdrawing Tool.

[1298] " A.H.H." (Cardiff) writes :—" I have often noticed that many workmen, when dismantling a piston from the connecting rod, usually do so by means of a hammer and a, short piece of brass. This is by no means the proper method of carrying out the operation in my opinion, as this part of the engine ought never to receive even a, tap from a hammer. " I am sending to you a rough sketch of a cramp which I have had made for the purpose of withdrawing the gudgeon pin from the piston. [We have had this redrawn.—En.] The cramp, which is of the shape shown in the sketch, is provided with a set-pin of slightly smaller diameter than the gudgeon pin. The end of the set-pin which engages with the gudgeon pin to be removed is turned down to a centre point, and it will be seen that by turning the screw with a spanner or tenuity, sufficient pressure can be brought to bear to remove even the most obstinate pin, without causing injury. "I keep in stock several set-pins of various diameters to accommodate different sized gudgeonpins. Should the pin be solid, then the centre-point, shown in the sketch, becomes effectual and is just as satisfactory."

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Locations: Cardiff, London

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