kom Drivers &Mechanics
Page 71
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When Bedding the Big-ends.
[1293] " (Alexandria) writes :—" I send to you a sketch [We have had this rcdrawn.—En.] showing a very handy little appliance which I have successfully tried over a period of years. Many fellow readers have, on occasion, to overhaul corn Prevents the bending of the shaft.
partitively large engines. It is to these that the appliance will particularly appeal. A piece of in by 2 ins, angle-iron is required first. ln lergth this should be from 3 ins. to 6 ins. By means of drilled holes and suitable bolts this iron can be secured to the bench, and the crankshaft flange bolted on to it. This is illustrated in the end view on the sketch. A length of 2 ins. by 3 ins, wood with a V cut in the top end serves to support the tapered part of the shaft. If slots, instead of holes, be put in the angle-iron it will be inund that the holes in nearly every crankshaft flange—from motor engines, of course--can be brought into register."
A C.M.U.A, Examination Answer.
[1294] " W.B." (Finsbury) writes :—" Perhaps the following answer to a query which I tackled at the last C.M.U.A. examination will hoof interest to some readers. The question in the steam paper was No. 6, and I was requested to describe some form of wagon or tractoc boiler, and to state ,how I would remove and replace a faulty tube. I replied as follows. "Tine boiler on my wagon is of the locomotive type, with a short barrel, and there are about 51 smoke
tubes. The firebox is well built and stayed, the seams of the barrel are double-riveted, and the crown plate is well supported by bar stays and in. bolts. In order to remove a tube, I should first cut Off the head at the firebox end and drive out the ferrule if there was one fitted. I should then get a draining bar and dolly. The dolly should he made a tight fit in the tube, but the shoulder should be small enough to pass through the tube nlete. I should pass he drawing bar right through the tuhe and through the dolly, and at the smokebox end I should slip over
the drawing bar apiece of tube which was big enough to allow the faulty tube to pass through it. I should next Slip a large nut on the drawing bar and tightens it up to the large tube, so as to pull the boiler tube towards the smokehox end. As the nut was being tightened by my mate, I should give the dolly a few smart blows with a. heavy hammer ; by this means the tube could gradually be drawn out. I consider this method prevents damage to the tube, and if the tube is then cleaned and re-annealed it is semetimes possible to use it again."
The Location of the Headlamp.
The sender of the following communication has been awarded the 108. prize this treek.
[1295] " E.F.H." (New York City) writes :—" As I have to ,Sio a, lot -of driving over very bad roads, much of it at night, I found some time ago that the existMg scheme of headlamp arrangement was unsatisfactory. I resolved to remedy this if possible, and. set about the job in the following manner. " The lamp Inackets in-.'ere removed from their original positions and lengthened by means of a pieec of strap iron welded to them at the junction of the forks. An iron clamp was then made to fit around Aye upper portion of the spindle on which the ste.A.ing stub turns, and to this clamp the lower end of the enlarged bracket was riveted. The fitting was then placed in position and the belt drawn tight. Next the bracket was marked off and taken to he bent so that the turning point of the lamp coincided approximately wikh the axis of the spindle. The diameter of the lamp'Was such, however, that it. was necessa) y to revolve the clamp slightly when it was finally put in place so that no part of the appliance would foul the wheel."