IRONWORK REPAIRS IN TIMBER-FRAMED BUILDINGS.
Techniques used to
form wrought iron components. 3/5.
6.2 Drawing down:
This is the
action of reducing the section to a taper and increasing the length of a bar.
The hammer finish will be clearly evident. It is used on early iron L-ties
to extend the length of the main arm where the crook has been upset to strengthen
it (Fig. 6.7).
Stapled L-tie in the Barley Barn at Cressing Temple. The arm has been drawn
down in both directions, probably to compensate for the upset crook of the
L. This gives an elegant profile without loss of strength.
6.3 Spreading: This
is the flattening of a section in all directions to form a flat plate. This
can also be used to create flanges for eyes. Some iron L-ties have their terminals
spread to take a nail hole (Fig. 6.8).
The terminal of this L-tie on the Guild Hall, Lavenham, Suffolk has been spread
to accommodate a nail hole. It will also resist twisting to a greater degree.
6.4 Fullering: This
is a technique of flattening a section in one plane only. A fuller (Fig. 6.9)
is struck on the hot metal until a close series of grooves if formed. This
extends the length of the bar, but not the width, by flattening the section
in one direction only. The peaks and troughs are later evened out with the
plane face of the hammer. This gives hand-wrought iron its familiar beaten
A fuller is used to extend the length of a bar by reducing its thickness without
spreading. The ripples caused by hammering the metal over the blunt wedge
are smoothed out with a plane hammer afterwards.