"A COURSE IN WOOD TURNING"
By ARCHIE S. MILTON,OTTO K. WOHLERS
CONTENTS
CHAPTER I.- Introduction
CHAPTER II. - The Lathe
CHAPTER III. - Wood Turning Tools
CHAPTER IV. - Spindle Turning
CHAPTER V. - Tool Processes in Spindle Turning
CHAPTER VI.- Oval Turning
CHAPTER VII. - Duplicate Turning
CHAPTER VIII - Finishing and Polishing
CHAPTER IX - Face-Plate and Chuck Turning
CHAPTER X - Tool Processes in Face-Plate and Chuck Turning
CHAPTER XI - Spiral Turning
DUPLICATE TURNING
Under the head of duplicate turning have been classified only such
models as clearly indicate the necessity of making two or more articles
to complete the model or set of articles desired. But it is not intended
to convey the idea that other models may not be made in duplicate as in
many cases it is very desirable and even preferable that they should be
made that way. Whatever the problem may be the suggestions offered at
this point may be applied effectively.
Whenever two or more models are to be made identically alike there are
always two possibilities of inaccuracies that will render the work
dissimilar: First, inaccurate measuring both for length and points of
new diameters and also on the new diameters themselves; second, a
variation in the curved surfaces either on long convex or concave cuts.
The first difficulty can be overcome to a great extent by the use of a
measuring stick. This stick should be made of any soft wood. It should
be straight on one edge and about the thickness of an ordinary rule. On
the straight edge lay off very carefully measurements for length,
shoulders, beads, concaves and all points where calipering for new
diameters will be necessary. Insert at each point measured a small brad
which has been sharpened at both ends, leaving the end protrude about
⅛". Care should be taken that all brads protrude the same distance.
After the stock has been turned to the largest diameter, the stick is
held in the position of the rule while measuring and the points are
forced against the revolving cylinder, thus scoring it. This stick can
be used as many times as the model is to be made and the measurements
will always be the same.
To avoid dissimilar curves it is well to cut out a full sized templet of
the model to be made. This templet can be made of any thin, stiff
material, preferably light sheet iron. In some cases it will be
necessary to make the templet in several pieces in order to help
facilitate the tool operations.
The use of this templet will not only be a help to getting all curved
surfaces the same, but will also check up on the various new diameters
on the model. The cylinder should never be in motion while the templet
is being used.
