Ian Bradley - Metalwork and Machining Hints and Tips for Home Machinists: 101 Plans and Drawings

Ian Bradley

Copyright 2021 by Ian Bradley and Fox Chapel Publishing Company, Inc., Mount Joy, PA.

Copyright Special Interest Model Books Ltd 2006

First published by Argus Books Ltd. 1988

Second edition published by Special Interest Model Books Ltd. 2006

First published in North America in 2021 by Fox Chapel Publishing, 903 Square Street, Mount Joy, PA 17552.

All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior permission of the copyright holder.

Print ISBN: 978-1-4971-0174-6
eISBN: 978-1-63741-041-7

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Correspondents have suggested to the author that much of the information put out by him over many years should be collected, edited and published as additional volumes to The Amateurs Workshop.

Accordingly, this material has been sifted and a choice made of subjects that should be of value both to the experienced amateur as well as to the novice himself.

Some of these subjects are basic to workshop practice, others are of a more advanced nature, but as none of them appear to be covered collectively in other publications, it is hoped that many workers will find this compilation useful.

Hungerford, 1988

Ian Bradley

One of the minor problems of lathe work is to re-chuck partly machined components so that, for example, they again run truly with a bore previously formed. A typical example is a pair of ball-bearing housings situated at either end of a machined bore.

Here, the usual practice is to grip a length of mild steel or brass rod in the self-centering chuck and to turn it down to an interference fit in the bore of the workpiece.

Stub-mandrels made in this way are turned some thou. oversize and the outer end is then eased with a fine Swiss file until, with the application of moderate wringing pressure, the component can engage for a sufficient distance to obtain a satisfactory hold. The projecting end of the mandrel should be center drilled, as for some operations the support of the tailstock may be required. After turning to size, and before the mandrel is removed from the chuck, it should be marked with a center-punch dot exactly opposite to the center of the face of the No. 1 jaw.

Fig. 1