Technical Thursdays - Punching Techniques for Relief Work archive
Thursday 13 March 2014
Frederick Wilbur examines the use of punches to enhance relief carvings
The technique of punching, stippling, or padding may not seem very germane to readers who are carving sculptural subjects, but for the relief carver, the technique is an important one to understand and master. The technique has often been dismissed with misleading brevity as a bastard of real woodcarving. The use of stippling can enhance the perception of a carving in a way unachievable otherwise, as surely, misuse of the technique can ruin a superbly carved piece. The mentions of this technique in my books were not as definitive as they should have been so I will take the opportunity in this article to address several omissions, the lack of dedicated photographs, and to correct some misconceptions.
PurposeThe purpose of stippling the ground of a relief carving is to create numerous shadows, as each impression into the wood will do. This increase in shadow makes the ground or background appear darker (see photo 1). This appearance, as well as the texture, presents a contrast with the modelled planes of the relief carved object. It is a technique used in low relief situations and not effective, indeed, not necessary in most cases, in mezzo-relievo or alto-relievo carvings as the shadow of the deeper recesses provide the needed contrast to make the carvings readable (see photo 2). There are, of course, other ways to emphasise the background of a relief carving - randomly ordered tool marks and consistently oriented grooves are just two possibilities.
AbuseThe abuse of the punching technique comes when it is employed to disguise a poorly worked, uneven ground. Also because it requires care, patience, and an understanding of the intention, the technique is often unevenly executed. From these abuses many writers have vehemently inveighed against the technique, advising not to use it at all. Sure, these shoddy practices occur, but many fine works have been enhanced by the proper use of the technique.
Occasionally, I have observed the use of punches to shade the under-lapping of elements in flat carving, but personally donâ€™t think the use works for the good of the carving, instead muddying the distinction between ground and depicted element.
It is possible to actually punch a design into the wood, but again, this gives punching a bad name and this practice is to be avoided (see photo 3).
Stippling punchesThe punches of the first group can be shop made or ordered from carvers' supply houses (see photo 4). Single points can be made from wire or cut nails, bolts, and miscellaneous rod and bar stock. The single point is simply ground or filed to the desired shape. It is best to mount these in a wooden handle so that finger fatigue is minimised. A wooden D-shaped handle seems ergonomically better and can be struck with a small carver's mallet.
What is available commercially are multiple pointed round, square (and rectangular), and triangular patterns â€“ these can be made by using a triangular mill file. First, file a series of valleys on the end of the stock. Then make a second series oriented 90° to the first, creating a number of pyramids. The tools of this group are the most common and are used to 'blanket' stipple the ground of relief carvings (see photo 5).
Figural punchesThe punches of the second group have limited use and are generally used as a diapering device. Gilder's supply houses also carry such stamps used to decorate gesso. Leatherworking suppliers are also a possibility (see photo 6). Most designs are difficult to make in the usual shop, but radiating designs like a sunburst or daisy or an X, can be made by filing the edges of a round blank. Any geometric shape, such as a hexagon or rhombus, can be made as well.
Eye punchesThe third group of eye punches is a very specialised one (see photo 7). The round face has a concave hemisphere, which leaves an impression of a dome representing an eyeball. Several sizes are available for birds, bears, or even bearded gentlemen.
Recess punchesThe last group of punches is for clarifying various recesses (see photo 8). The most frequently mentioned is the teardrop shaped ones used for the similarly shaped eyes of acanthus foliage. A triangular punch is sometimes used to stamp the recess between grapes or barriers in a bunch. An acute angled one may help with acute corners, between leaves for instance. Reliance on this sort of punch should not substitute for clean and careful workmanship. In photo 9, some of the various punches have been impressed on cherry (Prunus spp.).
Which timbers?Punching works most effectively on light or medium coloured woods; dark woods such as walnut tend to negate the creation of shadows (see photo 10). Woods which have strong grain patterns are also not the best candidates for the technique. Cherry is one of the best woods for the technique because it is a fine, closed pore species. Coarse, open grained woods such as red oak (Quercus rubra) are not as amenable to the technique as splintering can make the surface appear ragged.
But all this may depend on the finish to be applied. A penetrating oil usually makes punching â€“ as well as scratches and gouge stab marks â€“ more pronounced. Stains will also emphasise stippling. Experiment with different woods and finishes. There is no need to stipple the ground if the carving is to be painted with several colours, as the prudent use of colour should achieve the desired contrasts that stippling does in a 'natural' woodcarving.
When to punchThe technique is best used on smaller areas of ground. Large areas of ground should generally be left without blanket stippling, but is a good place to use the figural punches of group two. As with any diaper pattern used as 'wallpaper', the intention is to break-up or fill-up the blankness of the ground. The individual impressions should be spaced randomly, but with evenness. In the 18th century moulding shown in photo 11, single dimples are spaced in a similar way in an effort to break up the ground.
Using the punchAfter the carving is completed, including undercutting, the ground should be smoothed. The stippling tool is struck with a mallet. The single point punch is held by one hand, heel on the surface of the material, and struck with rapid, light blows. The point is moved about as the mallet 'vibrates'. When using the multi-pointed stippling tool, the complete pattern of the punch is evenly impressed.
The procedure is repeated around the outline of the relief and the border, but the tool should overlap the previous impression and be turned so that the orientation of the lines do not line up. You should not be aware of the successive placings of the tool. Photo 12 shows (at the top) the 'blanket' stippling preferred, while the lower pattern shows the unevenness of successive placings of the tool.
The tool should not be struck so hard as to make a square or round indentation â€“ only the points should be impressed. Care should be used to strike the tools evenly throughout the entire ground â€“ practice on a scrap piece if unsure. Smaller tools with the same sized pyramids should be used to get into smaller areas, and a single pointed tool for the undercut areas.
Point of differenceNot to put too fine a point on the subject, but it should be noted that there is a subtle difference among the types of point you use. Photo 13 shows (going clockwise) the results of using tools with a coarse pyramid, a finer pyramid, a conica, and a round point.
Avoid trying to line-up the tool around a border or the outline of the carving â€“ the inevitable unevenness will be distracting. If done well, the stippling should not be noticed by the viewer, as the carving itself will be emphasised.
I often use a single pointed tool to avoid the mechanical feel of the multi-pointed tool â€“ it requires Sisyphean patience and many time-outs for tired hands, but the linen-like fineness of the stippling is worth the effort, especially on a shallow or incised design. On the bookrack end in photo 2, I spent more time stippling than incising the design.
Not every carving requires or would be improved by punching, but it should be another technique of the decorative carver to be practiced and considered in the design phase of woodcarving.