REBORING WORN CYLINDER BLOCKS
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OF considerable interest to managers of fleets of motor vehicles and to garage proprietors is the Van Norman automatic boring bar for reboring worn cylinder blocks ; this appliance is intended to give a perfectly aligned hole. It is marketed by E. P. Banns, Ltd., which concern has offices at 35-37, Upper Thames Street, London, E.C.4.
The tool is manufactured in two patterns ; one is termed a universal model (No. 600) and the other, designated No. 700, is intended for light work. The heavy unit is capable of boring holes with diameters ranging
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from 21 ins. to 6 ins., with a maximum depth of 14 ins. It is speedy and simple and has several attractive features.
It is designed to obviate Unnecessary hard work and to allow the operator to perform other duties while the block is being bored. The cutter of the Van Norman device is operated electrically, both when entering the cylinder and when being withdrawn from it.
Motors of 3 h.p. form part of the standard equipment, although for users who have to deal with a considerable amount of large-bore work 3 lip. units are recommended.
The reversing mechanism of the tool is automatic and micrometer adjustment is provided for. Four speeds are embodied and the drive is by worm and worm gear. The cutter head is of the self-centring type.
The light model is, perhaps, more suitable for use in connection with private Motorcars, although -it could probably be employed with advantage upon small commercial vehicles. The weight is only 90 lb., RO that the tool can easily be carried to the job and, without strain or inconvenience, can be lifted ,to a fairly high level.