Earn Drivers& Mechanics TEN SHILLINGS WEEKLY is paid for the
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best corn-, munication received, and one penny a line of ten words for anything else published, with an allowance for photographs.
Send us an account of any sheciai incident of your work or experience. If suitable, we ritZ eiN year notes, suPPly a sketch when required, and pay you jar everything published. Mention your employer's name, in confidence, as evidence of good faint. Agfelress to The Editor, TkIE COMMERCIAL MOTOR, Rosebery Atoenve, London, E.C.
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9.10 on Thursday ; 9.8 on Friday ; 9.7 on Saturday ; 9.5 en Monday ; 9.3 on Tuesday ; 9.2 on Wednesday.
A Simple Jig for Drilling Cotter-holes.
The sender of the following communication has been awarded the 10s. prize this week.
[15401 " D.W.B.' (Netheravon) writes I enclose for your D. and M.' pages a sketch [We have had this redrawn.—En.] and a description of a useful jig which should prove of interest to many of your
readers. A job which recently came under my personal supervision was the cutting of cotter holes in a large batch of steel rods, and at first the work was tackled in the usual way by drilling a number of holes and then removing the surplus metal by filing. This method, without the aid of a jig, proved long and expensive, as; drills were frequently broken owing to the holes running into one another, and, moreover, the quality of the work was not good, as it was difficult to get the holes all accurate.
" To get out of the difficulty I designed a simple jig, which entirely remedied these faults and enabled the work to be done in considerably less time. It is of very simple design, consisting of a cast-iron body, which was drilled and counter-bored to receive dog clamping-bolts. Behind these bolts are fitted small compression springs to facilitate the release of the work.
"A top plate, which is fitted with three hardenedsteel bushes, is fitted to the top of the block by two setscrews. The bottom of the block has a groove planed in it to receive a setting strip, which fixes the position of the cotter hole relatively to the end of the raid. As half the rods required slots in a different position to the remainder, the strip was provided with a slot to allow for setting the jig to suit, being backed whore required by means of a setscrew.
"The method of operation should be quite obvious. The rod is clamped in position and the drill is guided into the hardened bushes. The operation is repeated as many times as is required to drill as much of the cotter hole as possible, and the surplus metal is then trimmed away by means of a file." A Novel Method of Drilling.
[1541] " J.S." (Ca.stleford) writes :—" A short time ago I had considerable trouble owing to the flywheel of the steam wagon I drive tonang loose, the vibration jarring the keys and wearing the keyways to a considerable extent. To effect a repaer I cut the keyways slightly larger and fitted two new keys. I then drew the wagon to the side of a wall, and fitted up-a ratchet-brace between the latter and the flywheel shaft. Into the chuck of the brace I had previously fitted a in. tapping-drill. " Now, by starting the engine and running it slowly, I was able to drill a hole in the end of the sila.ft to a depth of 1.1, in. This I tapped out .1, be Whitworth to suit a in. setscrew. I then obtained
a piece of steel in, thick and 3 ins. in diameter, and fitted it over the end of the shaft, holding ittin position by the setscrew.
" Screwing the whole affair up tightly, the keys were held firmly in position, and it was impossible for a flywheel to jar loose. The steamer has now been running for some considerable time with the new fitting, and up to the present time has caused no trouble."
A Hardy Old Steamer.
05421 " 0.1.J." (Birmingham) writes :—"I am sending you herewith a photograph—[We reproduce this.. --Eel— of a 40 n.h.p. Darracq-Serpollet steam car, owned by Messrs. Harts, of Birmingham and Walsail. This vehicle is in constant carrying service between the above-mentioned towns; and is proving quite satisfactory.
"The upkeep is very small indeed, the machine averaging over five miles to the gallon of paraffin, and attaining speeds up to 25 miles per hour with five-ton loads. Steam is. generated in a boiler of the flash type, which is heated by a Simpson five-jet paraffin burner. The engine is single-acting with mushroom valves, and the final drive is by Benold silent chains. These chains have proved very satisfactory."