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Wedging prepares the clay for optimal use. Wedging makes the clay more pliable, ensures a uniform consistency, and removes air pockets as well as small hard spots in the clay before you use or reuse the clay for a project. When reclaiming clay, wedging ensures all the clay is incorporates together.
What happens if I don’t wedge my clay?
There are usually no air bubbles in it! In fact, improper wedging will more often add bubbles and you’ll just dry out your clay in the process. Simply make sure the pieces get enough drying time and have no plaster mixed in with the clay- that IS a sure recipe for explosions.
What should I wedge my clay on?
Every potter needs a surface to wedge clay on, and there are many different types. The most common are plaster, plaster covered in canvas, and plywood covered in canvas. Other possibilities are concrete, granite, masonite, concrete board and hardibacker board. The simplest wedging surface is a piece of canvas.
When should you wedge your clay?
You should wedge at least 30 times when it’s fresh out of the bag. When it’s recycled clay, you will need to wedge it at least 100 times if not more depending on the condition of your clay.
Do I need to wedge new clay?
In theory, a new bag of clay does not contain air bubbles. Nevertheless, even if your clay is brand new, it is still a good idea to wedge it. There may be some air pockets present. It is important to remove air bubbles is that they cause your piece to explode in the kiln.
Do air bubbles cause clay to explode?
A thin piece of clay with an air bubble will dry and fire without issue. When the kiln temperature rises, the air pockets fill with water vapor, which builds pressure as water turns to steam. The pressure of the steam causes the clay to explode from the inside.
Why is it important to wedge clay?
Wedging prepares the clay for optimal use. Wedging makes the clay more pliable, ensures a uniform consistency, and removes air pockets as well as small hard spots in the clay before you use or reuse the clay for a project. When reclaiming clay, wedging ensures all the clay is incorporates together.
What surface does clay not stick to?
Most air dry clays are sticky, and you don’t want that on your work surface. We recommend protecting the work area with items such as wax paper, silicone baking mats, or vinyl placemats. This will keep your table protected and make clean up much easier!Mar 8, 2018.
What is the best surface to use clay on?
Polymer clay is naturally sticky and tends to stick to your tools as you use them. When cutting pieces or shapes from a sheet or slab of polymer clay, the best way to keep the clay from sticking in the cutters is to use a work surface that the clay sticks to. A glossy ceramic tile or a glass work surface is perfect.
How do you wedge a large amount of clay?
If you’re throwing large pots, try using softer clay and throw it dry (or with less water) to avoid degenerating it to mush. Wedge using the weight and strength of your whole body on a wedging table of the proper height. Ideally, the table height should be equal to the distance between fingertips and floor (figure 1).
What are the two main ways can wedge clay called?
So it’s important to learn how to wedge clay properly. There are various different ways to wedge clay— ram’s head, spiral wedging, and wire wedging to name a few.
What is clay that has not been fired called?
Greenware This refers to ceramic ware that has not been fired. Bisque The term bisque refers to ceramic ware that has been fired once without glaze.
How is clay prepared for pottery?
Processing Clay for Pottery. To use the wet extraction method, start by filling a bucket about 1/3 of the way with soil. Add water and use your hands to break up the soil particles as finely as you can get them. Allow the soil to hydrate for a few minutes, or preferably a few hours.
What do you do when clay is too wet?
If you add too much water, fold the edges of the bag down and let it sit open in the sun so some of the moisture can evaporate. You can also do this if the contents are just too wet to begin with. Once you’ve got your clay well mixed, tie off the bag and let it sit for about 24 hours.
Is there a machine that wedges clay?
A Pugmill is a machine with a horizontal chamber that loads on the top. The chamber is a metal cylinder with an auger inside. An auger looks like a large screw. It turns and wedges the clay, discharging the wedged clay at the other end.
What happens if there is an air bubble in clay?
Air bubbles in clay items are dangerous because they can cause explosions in the kiln. The air bubble dilates due to heat and forces the clay to crack or explode and shatter the ceramic piece. The risk of explosion increases with the temperature in the kiln.
Can kilns explode?
But why do pieces explode in the kiln? The pressure from the steam, and nowhere for it to escape, causes the piece to explode. If there’s too much moisture in your greenware, especially moisture inside hollow air pockets within the clay, you run the risk of having your greenware explode.
What is the difference between wedging and kneading clay?
Wedging is a specific type of kneading. The goal with wedging is to mix the clay without adding air bubbles. If you do it correctly, you’ll remove air bubbles. I was taught two types of wedging- knead (or ram’s head) and spiral.
Why is it important to score and slip clay?
Scoring and slipping. Clay pieces that are drier and harder, or that you want to join together without blending or altering their forms, traditionally must be scored and slipped (or slipped and scored). In this process slip, a liquid mixture of clay and water, is used to help weld the pieces together.
What is clay slip made of?
Slip consists of clay particles suspended in water. Its consistency will vary according to use, ranging from thick cream to butter milk. It can be used to bond pieces of clay together, to decorate and protect pottery or it can be poured into a mold and used to cast objects.
