Access the full text.
Sign up today, get DeepDyve free for 14 days.
References for this paper are not available at this time. We will be adding them shortly, thank you for your patience.
A Selection of Notes on Recent Equipment and New and Well-Tried Methods and Materials New Adjustable Spanners and Pipe Wrenches The Euco Automatic Arbour Evidence of careful thought in the design of adjust It is well known to Production Engineers that much able spanners and wrenches is welcome. The adjust 'second operation' lathe work takes considerably able spanner that slips round the nut and causes more time than is required for the initial machining on barked knuckles docs so for a number of reasons; capstan, turret and automatic lathes; in the case of the Humphris & Sons Ltd. have investigated these automatic the comparison in production times is reasons and have produced a new range of adjust- frequently startling. ables which they claim have none of these faults. Components which require to be held in the bore Adjustable spanners slip because the thumb-nut is for 'second operations' are undoubtedly the greatest too small to enable the operator to grip the jaws time absorbers in this respect. Not only is it necessary tightly on the nut and because it rotates during use of to make a suitable arbour to hold the component, the spanner. The Humphris' Micromaster spanners which must be previously bored to close limits to have a revolving extension to the handle which ensure a good fit, but it is invariably necessary either takes up thrust, journal and retraction loads on a to drive it on a tapered arbour and knock it off after specially incorporated ball race. This eliminates wear machining or to clamp it on a shouldered arbour and and friction and enables the jaws to be given a grip subsequently to remove the clamping arrangement in order to release the component. like a hand vice, so that these spanners will actually hold on to broken screws and pull out split pins. The Such time-consuming procedure is usual machine fact that the adjusting handle is held by the operator shop practice and it suffers from such difficulties as an while using the tool prevents its uncontrolled rotation. imperfect fit of the component on the arbour. The adjusting mechanism is protected from grit The Euco Automatic Arbour is claimed to treble because it is enclosed in a body part of hydraulically production by: 1, eliminating 80 per cent of the time drawn steel tubing. taken to 'load' and 'unload' the work; 2, removing the necessity for boring to close limits, merely to ensure This locating of the adjusting screw at the tail end of the spanner has the advantage of allowing the jaws a good fit on an ordinary arbour; 3, providing a A Birlec Gas Carburizing Furnace to be tightened on to a nut without withdrawing the means to hold components with 'Blind Holes' and Birlec gas carburizing furnaces have become well tool from a confined space and this has been exploited having very little gripping surface; 4, providing an known in the past few years for their rapid, uniform to the full by producing a 15 in. version of the 9 in. accurately ground shoulder for the work to bear case-hardening and their climination of dirty carburiz spanner. We have tried this unusual tool and it not against. ing compound' and the attendant laborious packing only allows awkwardly placed nuts to be reached but, In effect, the automatic arbour converts the usual and unpacking of containers. A particularly interesting of course, provides enormous leverage—although the collet from holding externally to holding internally, as example is a fully automatic, rotary-drum type furnace latter can be dangerous if carelessly used. can be gathered from FIG. 2. The hardened and ground designed for carburizing small parts in quantity. The patented interlock system of deep grooves in spigot A fits into the lathe collet and is retained in This unit is fully mechanized to reduce labour to an part of the jaw surfaces is to ensure that any uncon position by spring action. When the collet is open, the absolute minimum. Charging, tumbling of the charge trolled movement of the nut between the jaw surfaces arbour B is collapsed and ready to receive the com to ensure complete uniformity of treament, and dis is arrested. Any slip due to the worn faces of a nut, for ponent C which can be freely placed over the arbour. charge direct into the quenching tank arc all made instance, is brought up sharply by the engagement of Closure of the lathe collet automatically operates the automatic, remote-controlled operations, so that one the corners in the jaw serrations, and subsequent expansion mechanism, thus affording a firm grip in attendant can supervise the working of a battery of damage to the nut, the spanner and the operator is the bore of the component. such furnaces without difficulty and with complete prevented. The jaws are of hardened steel and arc After machining is completed the lathe collet is regularity of output and uniformity of results. This slim and convenient for use in confined spaces. opened with the machine spindle left running; this type of furnace can be used also for carburizing in Teeth formed in the jaw and body part of a pipe will automatically collapse the arbour and permit free compound, if desired, without involving packing of wrench cannot be properly hardened without risk of removal of the component and the immediate loading the work in boxes. fracture during use and when these teeth arc worn, of the next piece. Particulars of this unit, which is on show at the either the head or body part of the tool is useless. This is a precision tool, expanding accurately and B.I.F., can be had from Birlec Ltd., Tyburn Road, Further, adjustment requires two hands so that in use maintaining perfect concentricity with the collet; no Erdington, Birmingham, 24. the adjusting nut can easily move and alter the jaw other tools arc needed for its operation and loading or size, while they are top-heavy and often come apart in unloading of work can be effected without stopping the tool bag. The new Micromaster pipe wrenches arc the lathe. Sizes to accommodate all bores between ⅜ provided with hardened replaceable toothed jaws in. and 2 in. can be supplied and as each arbour has a which, if they ever wear out, can be renewed without working movement of 0.020 in. it will serve to hold the necessity of scrapping cither the head or body part. bores with varying diameters. Primarily designed for The adjusting nut is conveniently placed in the centre use on collet lathes, it may also be used for a wide of the tool for one-hand operation, the location of variety of work on milling, drilling and grinding the hinge in the jaw giving instant grip and release. machines, etc., thus saving considerable expense which would otherwise be entailed in providing special jigs All the Micromaster spanners and wrenches arc and fixtures. finished in a rust resisting gun blue. Full particulars of these tools can be had on application to Humphris Full details are obtainable from the manufacturers, & Sons Ltd., Parkstone, Dorset. Euco Tools Ltd., 44 London Road, Kingston, Surrey. May 1949 167
Aircraft Engineering and Aerospace Technology – Emerald Publishing
Published: May 1, 1949
Access the full text.
Sign up today, get DeepDyve free for 14 days.