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Main-bearing Boring Machine

8th August 1941, Page 22
8th August 1941
Page 22
Page 22, 8th August 1941 — Main-bearing Boring Machine
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to Meet Many Needs

The Cuthbert Power-driven Lineborer is a High Grade and Accurate Machine Tool of Clever Design and Marketed at a Reasonable Price

WELL known for they production . of high-class machine tools at reasonable cost, Warner Engineering Equipment, Ltd., By-Pass Road, Guildford, has developed a new main-bearing, line-boring machine, known as the Cuthbert, which will meet many needs. It has been designed to fulfil a want in the engine-reconditioning trade, as between the hand-operated or drill-operated boring bars and the very expensive universal line-borer, and the demand already experienced indicates that the capabilities of the machine are being appreciated. .

The prototype of the machine has been working in the company' a own premises for over 18 months, giving complete sat action, and we were greatly impressed by the quality an extent of the work it can perform, the bearings being finished to a mirror-like surface, whilst the cutting speed is about 1 in. per .40 secs. at 325 r.p.m., and the rate of feed .0055 in. per turn, • 1 The machine is, in all senses, a machine tool of very robust design, and weighs some 7 cwt. Its capacity is such that it will take the smallest engine blocks, boring to a diameter of 1.5 in.,. or deal with much larger bearings up to 3} ins. The clamping device for the block or crankcase is cleverly .designed, so that the longest can be conveniently handled, whilst in few instances is it necessary to remove the cylinder-head studs. .

Three bridge pieces are supplied. as standard equipment, but where the blanks are particularly large or long an additional one can be supplied.

Details of the genera/ construction can be gathered from our two illustrations, one showing the complete machine, and the other a close-up view of the driving-head and feed. The bridge pieces and pillars are of cast iron with universal swivel heads, accurately machined to locate the boring bar, and with split bearings for damping. The honsing for the bar drive is adjustable for height to any extent within the machine's limits, and is clamped, securely to the rear end swivel bead, thus giving rigidity of drive. It carries the grease-packed ball bearings for the lead-screw.

Steel plates, mounted on each side of the crankcase, carry the bridge pieces. They are 3 ft. 6 ins, long, and slotted to ensure quick mounting for very large blocks. Extra plates can be provided for use with the additional bridge piece.

The feed gears are steel-to-fibre contained in a greasepacked aluminium casing. Hand feeding can be employed for facing, radiusing, etc,, whilst the precision-ground boring bar is 6 ft. .6 ins. long, and machined for a tool at every 5 ins,

The main rails are 4 ft. overall with 134-in. centres in cast iron, accusately planed and mounted 'on -heavy castiron legs. The boring bay turns in either•direCtion, which facilitates setting of the cutters in the case of awkward or inaccessible bearings. Incidentally, the tools are set by a special micronnetfc which can be locked on to the boring 4 bar and ensures great accuracy.

In the illustration of the driving-head assembly viI1 be noted the sleeve and cotters wpich connect this to the end steady, thus ensuring rigidity of drive, intimacy between feed and work, and total absence of belt strain on the bar. The bar is instantly adkistable for position by means of the cotters on the feed sleeve. The hand wheel for facing, etc., is shown next to the pulley, which, when in °Oration, is covered by a guard. The universal mounting of -the bar " bearings and of the driving-head enables sloping crankcases, etc., to be dealt with.

It is claimed that tolerances may be kept as low as .00025 in., whilst ail blocks, front the largest vehicle oil engine to-the power unit of 'the smallest cat, can be dealt with. The up-and-down travel is some 18 ins., so that work on lathe headstocks, etc., can be performed almost level with the bed. Short and long V-driving belts are provided, whilst the head bridge-piece cán be inverted and the silpporting distanCe pieces removed to give this almost univFrsal application.

• The countershaft pulley is mounted eccentrically on its arm to afford adjustment of the primary drive belt from the fh.p. electric Motor. The •arm can also be swung on the centre line of the motor to adjust_the second driving belt.

.• The, standard machine, with motor, three bridge pieces and 'pillars; cutters and micrometer, sells at £125.

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