Pressure Test by Welders
Page 65
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Developments of Note for the Transport Executive and Engineer ‘V HETHER the reclamation of a component is economic will depend on whether a spare is readily obtainable and on its price. Where the component concerned is, say, a large light-alloy casting or cast-iron cylinder head intended for reclamation by welding, it is doubtful whether a successful job can be done other than by a specialist concern. Not only must the welding be perfect, but distortion must be reduced to a minimum.
Then comes the machining of the component to conform to the manufacturer's limits, which presupposes the possession of expensive machine tools seldom found in the average workshop. Many of the biggest operators of both passenger and goods vehicles now make use of specialist concerns for the reclamation of such parts as crankcases, bell housings, gearbox casings. cylinder heads and the like.
, A representative of The Commercial Motor recently visited Angell and Williams (Peckham), Ltd., Trafalgar Bridge Works, Sumner Road, London, S.E.15. who have specialized in such work for the past 30 years. When a worn or damaged part is received the cost of reclamation is assessed and if the figure approaches that of the new component, the customer is advised.
Tt is seldom that jobs are refused, although an efficient repair may require the fashioning of special parts for building up walls which have been so shattered that no sizeable pieces remain.
typical repair is to injection-pump body castings, of which the concern do dozens a week. Through careless handling or from other causes, large pieces are torn away, usually where the fuelpipe unions screw in. Whether or not the broken portion is available makes no difference, but in some cases it reduces the time taken in making the repair.
Cylinder blocks and cylinder heads sent in for treatment are first pressuretested to 80 p.s.i. This is not, of course, practicable in the case of a block which may have been smashed on the outer wall. After such components have been repaired, the pressure test is again applied, so that the customer is assured of a bottle-tight job.
Camshaft reclaiming consists of the electro-chemical deposition of nickel on the worn journals, and machining to a limit of 0.0003 in. The accurate machining of all repair work is carried out on the premises to the component maker's blueprint.
LOW-COST "INTER-COMM." SET
CLAIMED to be the lowest-priced equipment of its type, the Kedafon battery-operated inter-communication set, produced by Fonadek (Branson), Ltd.. Birmingham. 17, may appeal to operators seeking means for ready verbal contact between, for example. loading banks and traffic offices.
A master unit is connected t o a n extension by a flex and the caller depresses a button when speaking. The listener's hands are free to write down instructions. Calls can be made each way.
The equipment, which operates at sufficient volume to be audible in a noisy area and with reasonably good reproduction, costs 15 10s. 6d. with 7 yd. of flex supplied, extra flex costing Is. 3d, per yard. Replacement batteries are easily obtainable.
SELF-ADHESIVE DUST SEAL
A SELF-ADHESIVE polyurethane in foam draught and dust excluder is being marketed by Sealdraught, Ltd., Chandos House, Buckingham Gate, London, &W.1. It is claimed to stick to most surfaces that are free from dust
and grease, and are dry. Being an inorganic product. it is claimed also to resist insects and bacteria, and to be unaffected by light, oxygen or ozone.
It is produced in standard thicknesses of * in.. in. and -1 in,
VISUAL CONTROL IW PLASTICS A VISUAL control system, applicable, I—t for example, to vehicle movements, has been introduced by Steel Boyd and Co., Ltd., 257 St. Vincent Street, Glasgow, who manufacture the wall boards and symbols in plastics. The symbols may be fastened to the boards by static electric charges.
Low cost, lightness and simplicity are claimed advantages of the system, which can be made up in colours, sizes and rulings to customers' requirements.
RUNNING NUTS AT SPEED
KNOWN as the torque-controlled Impactool, a new hand tool made by the Ingersoll-Rand Co., Ltd.. 165 Queen Victoria Street, London. E.CA,
runs nuts to required torque at normal power and speed, but when the torque limit is reached the impact mechanism rebounds and trips a shut-off valve. Torque setting is simple. and is achieved in a few seconds by using a jig which turns a torsion bar and calibration collar to the desired reading against rigid splines on the torque-bar adjusting sleeve.
Once set, the torque setting remains constant during the nut-running operation, and releasing the trigger resets the tool automatically.