Repoussé….The Process of “Sinking”
“Candlestick 2005.” 6 1/2″ x 12″, mild steel, black Gilders Paste finish. Photo by George Lottermoser.
There are different processes of repoussé, as explained in an earlier discussion here. Today we will take a closer look at the process of sinking. The below-story board shows the development of a bobeche, the pattern of which was used for a chandelier I made for the “Captain Frederick Pabst Mansion“ in Milwaukee, as well as for the candlestick shown above.
Note: All of the work shown below was performed cold (without applied heat.) All photos below were taken by me.
The next series of images will show you some of the techniques and tools used in sinking.
The image below shows a flared tube, and a ball punch that was used to sink the middle portion of the bobeche.
Before any sinking begins, all of the surface detail is applied to the pattern with curved and straight chisels. This next image shows the above tools in action.
After the middle has been sunk, the middle veins on the individual leaves are sunk down into a hardwood stump. The stump has a slight crease-like depression in it to allow the material to move down. (The shape of the depression would be a little larger than the impression made by the punch used.) The punch used has a slightly curved blade, and instead of a sharp chisel edge, the edge has been lightly ground so it pushes rather than cuts the metal.
Using the same stump, but a different depression, the lobes of these leaves are roughed in with a large ball tool. The only way I can describe the depression is this….the depression looks like it would cradle the buttocks of a gnome quite comfortably.
Next, dimple-like features are added using a smaller ball tool to give more life to the leaves, adding slight flip to the tips. The back-up in this case is a lead block.
Note: Occasionally, heat is used in the repoussé processes. Do not use a lead back-up if you heat the metal. The lead will become molten, and will proceed to splatter, potentially causing serious burns to you, or others around you. (Unfortunately, I learned this the hard way.)
Finally, on three of the leaves, the ends are scrolled cold, over the edge of the anvil using a small hammer.
Refer to “Ironwork Processes” if you wish to see the “French Repoussé ” process, otherwise known as the “Hammer and Stake” method.
“The problem is not that there are problems. The problem is expecting otherwise and thinking that having problems is a problem.”…..Theodore Rubin, Author.