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Tools for the Workshop

Tools for the Workshop A I R C R A F T E N G I N E E R I N G Workshop and Production Section June, 1941 Details of Some Practical Machines for various Duties A New Wolf Drill Particular s have recently been released of a new light duty electric hand drill in the Wolf series. This is a tool, given the trade name of Dartdrill, which is mad e in in. and in capacity models. An unusual feature of th e design of the Dartdrill is tha t it is held in a case made from two half castings as shown in Fig. 1. Self-lubricating bearings are used throughout and a ball thrus t race is fitted to the drill spindle. Th e drill motor is of the universal type designed for use with either D.C. or A.C. 25 to 60 cycle sup- plies. The standard windings are for r>0, 100/120, 130, 200/220 and 220/2,50 volts. Full particulars of this drill may be had on application to th e manufacturer, S. Wolf & Co. Ltd., Pioneer Works, London, W.5 . A Small Jig Borer Th e Newall No. 0 jig borer is scarcely a small machine, although it was produced to meet the de­ man d for those for whom the standard No. 1 was larger than necessary. The No. 0 is generally similar t o th e well-known No. 1 an d is virtually a " scaled- down " version of that machine. Th e layout of base and table are like that of the earlier type, and a Ward Leonard control set is pro­ vided, as was the case with the older tool. The Newall Micro-locator is used for the adjustment of both longitudinal and cross slides. This Micro-locator is an astonishingly accurate instrument ; being guaranteed by the manufac­ turers to 0·0001 in. The Micro-locators can be seen in place on the slides of a No. 0 jig borer in Fig. 3. Th e unit consists of a serie s of very accurate rollers, a micrometer and a dial indicator. The rollers, learn to make readings and settings to a degree of which are housed in a carrier fixed to the table, are accuracy comparable with tha t of a five inch sine bar each one inch in diameter and are used as th e main in the hands of a skilled operator. The protractor gauges. These rollers are chromium plated and are is self-contained, small, and easy to apply to jigs, lapped to an accuracy of + 0·00002 in. The micro­ fixtures, bench work, surface plates and to work in meter is of the same form as th e band type, but has machines, and can be used where the sine bar a very muc h larger, an d consequently more accurate, would be difficult or impractical. Th e optical protractor is built upon an adjustable base and the ring centre of the instrument revolves, carrying with it a spirit level and protractor scale which are viewed through an eyepiece. No calcu­ lations are required, as the scale is equipped with a vernier which permits direct reading to one minute of are. The adjustable base enables the protractor t o be corrected for any inaccuracy from the true level in the bed of the machine. After truing the base, th e centre ring is revolved by hand or by the micrometer screw, which acts as a fine adjustment, until the required angle appears on the scale. The protracto r is then placed upon the work, which is the n turned until the level bubble becomes central. Th e base of the protractor has provision for using th e instrument upon round stock. For this a barrel scale. It is mounted in a carrier with a yee slotted-V base, with a secondary level, is provided. block base which lies between the rollers. The dial Th e scale and vernier are completely housed in a is connected with the micrometer. strong metal casing into which is also mounted the Th e Micro-locator is pre-set by fitting the vee- spirit level. The slottcd-V base is of hardened and block between the appropriate rollers for the num­ ground steel. ber of whole inches and adjusting the micrometer to read the decimal required. The slide is then moved Full particulars of the instrument may be had from A. C. Wickman Ltd., 10 Princes Street, until the needle on the dial reaches the zero mark. London, S.W.I. Th e No. 0 jig borer is supplied with a considerable amoun t of equipment and many accessories are available. A brief specification of the machine is given below :— Working surface of table 18 in. x 12 in. Longitudinal traverse ... ... 12 in. Cross travers e ... ... ... i) in. Vertical travel of spindle quill ... 5 in. Vertical adjustment of quill head ... (6 in. Distance from spindle to column ways ... ... ... ... 11·25 in. Distance of spindle t o table ... max. 14 in. min. It in. Morse-taper, spindle collet ... No. 2 Speed range (infinite) ... 113—1,800 r.p.m. Tabl e settings ... 0·0001 in. or 0·002 mm. Full particulars of this machine can be obtained from E. H. Jones (Machine Tools) Ltd., The Hyde, London, N.9. An Optical Protractor This optical protractor is designed to supply the need for an instrument for accurate measuring by unskilled operators. Angles to one minute of are can be read directly off the scale, thu s eliminating calculation or reference. Unskilled operators quickly http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Aircraft Engineering and Aerospace Technology Emerald Publishing

Tools for the Workshop

Aircraft Engineering and Aerospace Technology , Volume 13 (6): 1 – Jun 1, 1941

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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0002-2667
DOI
10.1108/eb030792
Publisher site
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Abstract

A I R C R A F T E N G I N E E R I N G Workshop and Production Section June, 1941 Details of Some Practical Machines for various Duties A New Wolf Drill Particular s have recently been released of a new light duty electric hand drill in the Wolf series. This is a tool, given the trade name of Dartdrill, which is mad e in in. and in capacity models. An unusual feature of th e design of the Dartdrill is tha t it is held in a case made from two half castings as shown in Fig. 1. Self-lubricating bearings are used throughout and a ball thrus t race is fitted to the drill spindle. Th e drill motor is of the universal type designed for use with either D.C. or A.C. 25 to 60 cycle sup- plies. The standard windings are for r>0, 100/120, 130, 200/220 and 220/2,50 volts. Full particulars of this drill may be had on application to th e manufacturer, S. Wolf & Co. Ltd., Pioneer Works, London, W.5 . A Small Jig Borer Th e Newall No. 0 jig borer is scarcely a small machine, although it was produced to meet the de­ man d for those for whom the standard No. 1 was larger than necessary. The No. 0 is generally similar t o th e well-known No. 1 an d is virtually a " scaled- down " version of that machine. Th e layout of base and table are like that of the earlier type, and a Ward Leonard control set is pro­ vided, as was the case with the older tool. The Newall Micro-locator is used for the adjustment of both longitudinal and cross slides. This Micro-locator is an astonishingly accurate instrument ; being guaranteed by the manufac­ turers to 0·0001 in. The Micro-locators can be seen in place on the slides of a No. 0 jig borer in Fig. 3. Th e unit consists of a serie s of very accurate rollers, a micrometer and a dial indicator. The rollers, learn to make readings and settings to a degree of which are housed in a carrier fixed to the table, are accuracy comparable with tha t of a five inch sine bar each one inch in diameter and are used as th e main in the hands of a skilled operator. The protractor gauges. These rollers are chromium plated and are is self-contained, small, and easy to apply to jigs, lapped to an accuracy of + 0·00002 in. The micro­ fixtures, bench work, surface plates and to work in meter is of the same form as th e band type, but has machines, and can be used where the sine bar a very muc h larger, an d consequently more accurate, would be difficult or impractical. Th e optical protractor is built upon an adjustable base and the ring centre of the instrument revolves, carrying with it a spirit level and protractor scale which are viewed through an eyepiece. No calcu­ lations are required, as the scale is equipped with a vernier which permits direct reading to one minute of are. The adjustable base enables the protractor t o be corrected for any inaccuracy from the true level in the bed of the machine. After truing the base, th e centre ring is revolved by hand or by the micrometer screw, which acts as a fine adjustment, until the required angle appears on the scale. The protracto r is then placed upon the work, which is the n turned until the level bubble becomes central. Th e base of the protractor has provision for using th e instrument upon round stock. For this a barrel scale. It is mounted in a carrier with a yee slotted-V base, with a secondary level, is provided. block base which lies between the rollers. The dial Th e scale and vernier are completely housed in a is connected with the micrometer. strong metal casing into which is also mounted the Th e Micro-locator is pre-set by fitting the vee- spirit level. The slottcd-V base is of hardened and block between the appropriate rollers for the num­ ground steel. ber of whole inches and adjusting the micrometer to read the decimal required. The slide is then moved Full particulars of the instrument may be had from A. C. Wickman Ltd., 10 Princes Street, until the needle on the dial reaches the zero mark. London, S.W.I. Th e No. 0 jig borer is supplied with a considerable amoun t of equipment and many accessories are available. A brief specification of the machine is given below :— Working surface of table 18 in. x 12 in. Longitudinal traverse ... ... 12 in. Cross travers e ... ... ... i) in. Vertical travel of spindle quill ... 5 in. Vertical adjustment of quill head ... (6 in. Distance from spindle to column ways ... ... ... ... 11·25 in. Distance of spindle t o table ... max. 14 in. min. It in. Morse-taper, spindle collet ... No. 2 Speed range (infinite) ... 113—1,800 r.p.m. Tabl e settings ... 0·0001 in. or 0·002 mm. Full particulars of this machine can be obtained from E. H. Jones (Machine Tools) Ltd., The Hyde, London, N.9. An Optical Protractor This optical protractor is designed to supply the need for an instrument for accurate measuring by unskilled operators. Angles to one minute of are can be read directly off the scale, thu s eliminating calculation or reference. Unskilled operators quickly

Journal

Aircraft Engineering and Aerospace TechnologyEmerald Publishing

Published: Jun 1, 1941

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