A 3-in. Indexing Attachment
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AHORIZONTAL 3-in, indexing attachment forms a recent addition to the range of Marko precision equipment made by W. H. Marley and Co., Ltd., 105, High Road, London, N.11. It has been designed to speed up certain operations which normally call for the use of a dividing head. The headstock is adapted to take work held either in a chuck or between centres. The solid centre rotates in a lapped bore and is drawn into position by a nut at the bark end.
Two tailstocks are available, the standard one for use on such operations as milling and drilling, and the other, wh'ch has a spring-loaded centre, for grinding. Essential details are: Centre height, 3 1/32 ins., Overall height, 5l ins., length with centres touching, 13 ins., chuck capacity. 31 ins. and weight with chuck mounted, 221 lb. The price with either type of tailstock is £35. formance combined with relatively low current!consumption and enables the van to get back to its base should the battery be heavily discharged.
Apart from the fitting of a traction battery, the replacement of the engine by -a •6 h.p. electric motor, made by Small Electric Motors, Ltd., Beckenham, Kent, and the removal of direct drive from the gearbox, there is no marked difference between the major assemblies of the Trojan and those of its electrically driven counterpart. Special mounting pads are fitted so that the electric motor can be housed under the bonnet and a back plate is provided for the standard clutch to be attached.
The gearbox, with two forward and one reverse ratios, is retained. These are indirect gears, so that the overall