Nom 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 steelal incident of your work or exfierience. If suitable, we will edit your notes, supply a sketch when required, and pay you for everything published. Mention your ewiiloyer's name, in confidence, as evidence of good faith. Address to Ths Editor, THE COMMERCIAL. MOTOR, Rosebery Avenue, London, E.G.
Light Up Your Lamps At 4.50 on Thursday ; 4.50 on Friday ; 4.31 on Saturday ; 4.52 on Monday ; 4.52 on Tuesday ; 4.53 on W ednesday.
Remetalling Bearing Brasses.
ne sender of the following communication has been awarded the Ws. prize this week.
[1404] " W.B.D." ((arstang) writes :—" Many drivers will find it an advantage to be in a position to remetal worn bearings. It is really a simple matter, providing one takes a little tare and also exercises cleanliness in the process, so as to ensure proper adhesion of the anti-friction metal to the main shell.
The tube and saw-blades form the cores " The following is a description tafr a method which I myself have adopted in this part of engine overhaul, and I send you a sketch [We have had this redrawn.--En.] showing the two brasses in position ready for the metal to be poured in, There are not many parts required in the outfit, the ehief part being a small face plate, or, indeed, an accuratelymachined cast-iron plate will suit.
"The essential feature, however, is that a in. diameter Whitworth hole should be. tapped through its centre to accommodate a. clamping-down bolt. A piece of asbestos, the overall size of which should be larger than the two halves of the brasses when placed together, should be procured, and a hole drilled in its centre, a little larger in diameter than that in the plate. To provide a core for the two halves of the brasses, obtain a few pieces of wrought. iron tubes of various: diameters, according to the size of the brasses to be operated on.
" Now turn a long bolt to enable the bearings to be fixed to the surface plate in a vertical position. For this purpose a piece of rectangular mild-steel bar, having a in. hole drilled through, placed across the top edge of the brasses will act as a clamp. Before tightening the brasses down, two pieces of broken hack-saw blade should be placed between the two halves, so as to separate the metal during the process of pouring. " The old inner shell of anti-friction metal should be completely removed, and the brasses thoroughly cleaned and well tinned before attempting to remetal„ taking care to scrape out all the metal from each lip of the bearing. Previous to placing the tube in position, it should he well coated with lamp-black, to prevent the metal's sticking. The brasses should, of course, be heated prior to pouring in the metal, and during the process of heating care should be taken that the tinned surface is not tarnished.
" Place the two halves of the brasses together with the saw blades in between, and clamp down with the bolt. Pour in the. metal, which should not be too hot, and, of course, it will be realized that a sufficient quantity should be at hand to fill both the cores parted by the saw blades..
"I have used this method for quite a number of years, and have never experienced a single flaw in the remetalling. When tapped, the brasses ring like a bell."
When Using Small Taps.
[1405] " (Llaudaff) writes :—" I recently had occasion to oirler a set of taps and dies ranging in sizes from in. diameter -to in. With these the manufacturer sent a-wrench measuring about 10 ins. long, and when I came to use the smaller taps, had I. worked with the wrench its weight alone would have broken them, as, of course, a certain amount of care is necessary when using these delicate tools.
" To prevent such risks, I have made a device, as shown in the sketch—[We have had this redrawn.En.]—which enables me to use the in. diameter, -Ain. and in. diameter taps .on any job without fear of bringing undue strain to bear on them during the process of tapping out.
"The clamp is made out of mild-steel plate, and the bolts permit of its being adjusted to suit requirenients. .
" If any of my fellow readers care to try this they will experience less broken taps, a trouble which often occurs when an urgent job is in hand."