Decorative Ironwork by The Countryside Agency;

Author:The Countryside Agency;
Language: eng
Format: epub
Publisher: Fox Chapel Publishing

Fig. 53

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Fig. 57

Fig 58 In the final setting operation another special tool is brought into play (drawing, Fig 66, page).

This tool comprises a crescent-shaped former and four guide pegs spaced to accept the cut-away stem bearing the quatrefoil sections.

With the work at a red heat, and using a pair of round-nosed pliers in each hand, the horns of the crescents are squeezed into shape against the former.

Fig 59 Providing that the offsets have been accurately positioned and that the correct reductions have been made between centres to allow for the slight lengthening which occurs during hot splitting, the assembly of the grille is straightforward.

As the frame bars bear crescent shapes on their inner edges only, they will not tend to lengthen as much as the internal bars, and therefore it is advisable to mark off the centres of their offset sections at the finishing intervals, i.e., the interval given by the working drawing.

Small, unpredictable variations can occur occasionally between centres in forgings of this kind, which must be adjusted prior to final assembly. Such adjustments may be effected by lengthening by the drawing process or shortening by upsetting, whichever is appropriate for the correction of the faulty sections.

The bars are straightened and any twists are removed, after which the rivet holes are drilled in the bars forming the outer frame.

The frame is temporarily bolted together at the four corners and tested for squareness.

The horizontal and vertical bars are now laid one at a time on the frame and the positions of their end holes are scribered off and drilled.

One set of bars, either vertical or horizontal, are now drilled at the points of intersection.

The grille is temporarily bolted together and the positions of the holes in the set of undrilled bars are scribered through, drilled and replaced in position.

At this stage, with frame and bars bolted together and again tested for squareness, any overlapping of the quatrefoil segments is corrected with a small scroll wrench.

Small, final adjustments to the tips of the segments are made after the temporary bolts have been withdrawn singly and replaced with rivets.

If it is found necessary to resort to the use of heat the oxyacetylene torch is employed.

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