fig. 1.1 - click for a larger view |
The first thing
to do is to cut out the frames:
For frame A
you can take a piece out of the blockboard for the base and glue a
piece of ordinary three-ply on top in order to obtain the required
thickness of 16mm. From the dimensions on fig. 1.1, draw the full
size pattern on stiff paper or card. You need two tracings for this;
one for the outside pattern and one for the inside. Transfer the drawings
to your piece of wood and shape it accordingly. The little recess
for the under string bar can be made at a later stage.
Frame E:
This is the bottom part of the harp, and it is at an angle
of 58 degrees with the sound-board.
First, draw on paper
or card a series of parallel lines 24mm apart (a sheet of paper 450mm
by 450mm is required). In the centre, draw the axis line and on each
side of it mark the offsets taken from drawing E, fig. 1.1. Join all
points by a sweet curve.
Now take a piece
of blockboard and by means of carbon paper, trace your drawing on
to it. Then cut along the outline with a bowsaw, or better still,
a bandsaw. Cut out the circular hole in the centre of frame E with
a jigsaw or bowsaw.
Now, with a spokeshave,
plane the angles at top and bottom only. The bevelled sides of frame
E can be made later.
Frame D:
Trace ten parallel lines 16mm apart on a piece of paper, draw the
axis and mark the outline as you have done for frame E. Now, draw
the inside curve freehand so that it is shaped like fig. 1.1. Give
it a pleasing appearance; it does not need to be exactly as on the
plan and as long as the two sides are identical it will be all right.
Next, take a piece of plywood 10mm thick, and transfer the pattern
to the wood as before. Cut along the outline.
Frame C and Frame B are made in exactly the same
manner as frame D. The next step is to make the back piece F, fig.
1.1. Trace and cut out according to F, fig. 1.1 The two side rails
G, which have been omitted on the timber list on purpose, can be made
from any good piece of fir or pine: left over from a previous job.
Trace and cut according to G, fig. 1.1.
