As usual an interesting view on the magic Eckold machine. Simply described the tool introduced this time, the dome shaping tool, can be said to have the opposite function than the tool used in blogspot 17.
The work started with the rear inner part of the wing, the area where the wing and the outer part of the body is fitted close together separated by the wing beading. This time the new part was easy to make, after cutting a suitable piece of sheet in the bench shear it was bent in the folding machine, almost in 90 degrees.
After the old part was removed the new one was carefully dot welded in position, Image 1. The removed rusty part, hold by a magnet, can be seen in the picture.
With the rear end of the wing replaced with a new piece of sheet, see the marked area in Image 3 in blogspot 17, a previous made template was used to mark out the surplus material, Image 2. Note the use of a steel scale to adjust the position of the template in –X direction, see the book, and the arrow marking out the correct angle. Both the length and the angle are of great importance. At the end of the wing the running board should be bolted with a thin and smoothed shaped slot between the board and the body. And further, the rear end of the board must have a slot to the rear wing.
A new rear panel was made with the new running board front end as a template and dot welded to the end of the wing, image 3. Note the shape of holes for the screws. Similar oblong holes but turned 90 degrees were made in the corresponding running board end, Image 4, giving increased adjusting possibilities.
A control with a steel scale of the shape of the lower edge of the wing and the board revealed a deviation in shape between the two parts, Image 5. A new piece of sheet with correct shape was cut in the bench shear and the bend for the wire was created in the swage machine, Image 6.
To give the new panel the right shape it was shrunk. The shape was controlled against the wing and the running board, with the new panel was hold in place by welding clamps, Image 7.
The cutting line for the removal of the old sheet was made with a scriber, Image 8. Note that the cutting line was made slightly outside the new panel by holding the scriber in an angle. During the welding the new panel was hold firm to the old without any gap to give a smooth edge joint between new and old sheet along the lower edge.
The removal of the old panel is worth a short comment: if possible the old wire, if in good condition, was intended to still be used, saving some time and effort. With the old sheet removed the wire was found to be good enough to keep. The removal of the sheet wrapped around the wire was the critical part of the work.
In the book the description of a specially made spindle for worn out cutting discs was described in the text and with a drawing. With the spindle adapted with a super thin cutting disc in a small air grinder the front end was cut as in Image 9. The crucial point during this work was to leave the wire untouched. This is of great importance, see the book
If the wire was in need of a replacement the ends of the new wire and the old one must be welded together. A tricky operation described in detail in the book. If left without welding, the wired edge will crack after some time!
The Eckold tools demonstrated this time, see the short movie, is the dome shaping tool, Image 10. See the book for more detailed information. The effect of the tool is similar to the use of a mallet and a sandbag but the result is considerable smoother and made in a shorter time. Well made, read carefully with gradually increased but gentle stroke force, the finish is close to the finish achieved in the English wheel and easily corrected in the wheel up to the usual wheel standard, see the book.
The panel in image 11 is the center part of a roof beam at the rear end of the roof for a Chevrolet Impala -58. The profile was bent in the folding machine and given a light bow shape with the dome shaping tool, Image 12.
Another example of a part mainly created with the dome shaping g tool is the lower part of the rear panel for a Volvo P 1800. After shaping in the Eckold machine, Image 13, and a brief correcting treatment in the English wheel, Image 14, the new panel was tested on the car, Image 15.
The tool is available in several sizes from 60 up to 150 mm diameter. As with the tool in blogspot 17 the good manner of the tool depends on its rubber cushions.
To be continued……