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horn Drivers &Mechanics

1st April 1915, Page 19
1st April 1915
Page 19
Page 19, 1st April 1915 — horn Drivers &Mechanics
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Which of the following most accurately describes the problem?

TEN SHILLINGS WEEKLY is paid for the best communication received, and nine penny a line of ten words for anything else published, with an allowance for photographs.

Light Up Your Lamps at — 7.30 on Thursday ; 7.32 on Friday ; 7.34 on Saturday ; 7.37 on Monday • 7.38 on Tuesday ; 7.39 on Wednesday.

Another Stud Box.

[1611] " A.R.H." (Leyland) writes Having read letter No. 1608 by J.C.H.' (Bristol), in your issue of 18th March, describing a stud box fitted with a taper pin, I thought perhaps a description of the following, which I consider to be an improvement, might find a place on your D. and M.'. page. "My objection to the taper pin method is, that when a stud is being screwed into a soft metal, such as aluminium, which material is used extensively in motor work, the hammering which is necessary when the pin is being withdrawn must have a tendency to loosen the stud in the casting.

A case-hardened screw acts as a stop.

"The action of all stud boxes on the threads of the studs is the same. When pressure is put on the stud the box tries to draw it farther into itself ; the stud is forced down by contact between the bottom of the hole in the stud box and the top of the stud, consequently the top side of the thread in the stud box presses against the bottom side of the thread on the stud; • this is illustrated in the enlarged view in the sketch enclosed [which we have had redrawn.—En.], and, as will' be seen, there is a certain amount of clearance on the other side of the thread.

" If, on the withdrawal of the stud box, the resistance to unscrewing between the threads of the box and those of the stud istgreater. than the corresponding resistance between the stud and the casting, the stud will be withdrawn from the latter. If the method described by your correspondent be adopted, and the taper pin be withdrawn, the stud is then released, and rises in the stud box, taking up some of the clearance on the top side of the thread and freeing the box from the stud ; it is then possible to remove the box by hand, leaving the stud in the casting. "I think the same result can be obtained by a much

simpler method. It is only necessary to drill the hole in the stud box right through and tap it. Into one end a hardened setscrew can be fitted. When it is desired to remove the stud box, this setscrew should first be released. It will probably be necessary to utilize two spanners for this purpose : one to hold the stud box, the other to release 'the setscrew."

An Unusual Magneto Trouble..

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

[1612] " A. H.H." (Cardiff) writes :—" I send herewith for your 'D; and M.' pages sketch and details of an unusual magneto repair.

"I was out testing one of the buses the other day, •i and about a mile and a half from the garage the engine began to misfire. I got down and examined several parts, could find nothing wrong, so started the engine again. It turned over about 300 revolutions then misfired and stopped a second time. I made a second examination, and this time discovered that the ebonite brush holder of the magneto had broken away from the distributor wheel. The screws had all broken, and so also the slotted portion of the brush holder, which positions thabrush. In order to return with the bus to the garage, I thought it would be necessary to borrow another magneto. After a little thought, however, I devised the following scheme.

"I took the magneto out and removed all the broken pieces, and built them up as well as I could on to the wing of the bus. I was then able, with a little ingenuity to make a temporary replacement • from a piece of thick cardboard. This is fairly well illustrated in the sketch [which we have had redrawn.—En. ], and I should add that I fastened it in place by the aid of some wooden pegs and sealing wax. This of course, did not make a permanent repair, but it served to carry me back to the garage."

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Locations: Cardiff, Bristol

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