This is simple test can be done to determine if oversize particles are present in a raw material to be used for clay body manufacture. While materials are sold as minus 200 mesh, as you can see here, they don't even pass at 150 mesh. In each case, we have attempted to wash through 50 grams of the powder (using the technique of our WSR test).

All ceramic materials must be ground using particle size reduction equipment. This process enables removal of contaminants or reducing their size enough that they do not marr the fired surface of the body. This is a demanding task. Being able to measure it quickly enables spotting problems with a materials shipment (and therefore how well a supplier meets their quality obligations and the kind of product that can be made using it). Ball clays and kaolins are the most problematic, not just in particle size and contaminating particles but also fired color and plasticity.

Of course, a record of this needs to be kept. That is where your account at Insight-live.com comes in. Upload pictures like these or just make a note of the result.

3D print this, pour in plaster to make a slip casting mold! My previous work on this project assumed a smaller 3D printer (making it necessary to print flanged PLA mold sections that clip together). But larger 3D printers are now common, making the CAD work much easier. This drawing is parametric for height, body diameter, wall and plaster thickness, and neck height (for the full bottle set body=160mm, neck=96). This uses my standard clips and embeds (upper right). Neck vertices are proportional to height, so resizing works well. The top end is filleted to permit the longest possible mold on the print bed (diagonally). The bottom inside perimeter is chamfered, strengthening the default 0.8mm side wall junction to the base (that being said, be careful when removing it from the print bed, flexing too much will cause failure here).

Doing this smaller size is for prototyping and testing. Note that casting plaster on a 3D print creates artifacts (which will appear as wood grain, lower right), later I will create a hybrid plaster/PLA or rubber case mold. This PLA mold prints quickly, it has a hollow back side, permitting easy removal with a heat gun. There is no spare, it employs a pour spout, making the mold shorter and producing a better lip.

Need a stoneware slip casting recipe? L4768E or L4768H are a good choice. A glaze recipe? How about GA6-B (or similar)? Go full DIY with this, you will never turn back.

Glue one of these on top of your slip casting mold (using slip) and enjoy the many benefits. These are intended for people who make their own molds using the 3D printing techniques taught on this website. Among the advantages are the following:
-Less mess.
-Smaller, simpler molds (they don't need a spare).
-Overhung lips, more precise lips.
-Visible indication of casting progress.

Because of the ease of 3D printing case molds at home I can now pour plaster in them also. Of course, I am not in production; this is about creating prototype molds. This technique makes it possible to be precise in the amount of plaster used, so there is almost no waste. My tools are simply a good propeller mixer, and a scale and a 3-D printer (and a cooperative wife). Here is my procedure:
-Counterbalance a plastic container.
-Fill the mold with water and pour into the plastic container to get the weight in grams (and thus cc's).
-Plug that weight into https://plaster.glazy.org, set it to use centimenters and get the USG recommended weights for plastic and water.
-Put that amount of water in the flexible plastic container and tare it.
-Dump in the plaster needed (no need to sprinkle it, I have a good mixer).
-Set the timer for 4 minutes and let it soak.
-Put it under the mixer (at an angle as shown), set the speed to create a whirlpool just shy of pulling in any air (thus avoiding adding bubbles). Mix for 4 minutes and then pour it into the molds.
-Clean the mixer blade and shaft in a container of water (and throw that away outside). Let the plaster harden in the plastic container (it breaks away cleanly later).
-Let it set overnight and use a heat gun and pliers to carefully remove the PLA from the plaster.

He is the lone quality technician, part time. Incoming materials properties keep changing, but management pretends they aren't. Freddie is tired of dealing with what could be lurking in these pallets—grit and fired specks, drying cracks, warping, blistering - he's flying blind. It’s just a matter of time before something fails… and his name is on it! But there is a way to start "owning the problem" by starting QC small (using Insight-live):
-Number the pallets with a big marker.
-Add a new record in Insight-live, assign a new code number and date and link it to a specification.
-In the notes, log lot numbers from the bags and any pertinent details (e.g. supplier invoice, PO#).
-Upload supplier certificate photos.
-Grab samples through the bag spouts— one per lot or pallet.
-Do testing for oversize particles (especially in clays).
-Make SHAB test bars (for clays). Dry them in a dehydrator and fire them overnight (because production wants to start using this tomorrow!).
-Snap close-up photos of the fired bars and upload and annotate them for future comparison.

This is survivable QC. It won’t fix everything. Now he is Ready-Freddie, with a solid plan to stand on when the blame starts flying. Maybe he will even be able to establish coordination between sales, production, and QC (using a group account) and even refine the specifications and procedures for each material type.

This is the L3954B engobe. 15% Mason 6600 black body stain has been added (instead of the normal 10% Zircopax used for white). Of course, a cover glaze is needed for a functional surface. We put a lot of development work into producing a recipe fits this body, M340. It works even when thickly applied because it has the same fired maturity as the body. Lots of information is available on using L3954B (including mixing and adjustment instructions). Engobes are tricky to use, follow the links below to learn more. L3954B is designed to work on regular Plainsman M340 (this piece), M390 and Coffee Clay. Most important we document how to adjust its maturity, and thus firing shrinkage, to fine tune fit if needed. These bodies dry better than porcelains and are much less expensive, so coating them with an engobe to get a surface like this makes a lot of sense. Ed Phillipson discovered this 80 years ago, enabling selling ware made from these clays as white hotel ware.

These brass/plaster pyramids embed into plaster to provide a threaded hole that M3 bolts can screw into. That enables attaching 3D printed elements to plaster elements when making hybrid molds. Narrow inserts permit placement in cramped spaces and nearer edges.

These are made possible using M3 brass knurled nuts and M3 bolts that can be purchased on Amazon. The brass nuts can be pressed in using a soldering iron. The pyramid-shaped 3D-printed anchors are 13mm high, they will accommodate 12mm, or less, inserts (the longest ones in the kits shown here bottom left). The holes are 4.4mm dia at the top and taper inward at -2 degrees. Of course, you can adjust sizes and angles as needed for your application.

These two unglazed pieces are made from the same clay, M340. They are fired at the same temperature. But the one on the right has 1% talc added. Greying of the color is a characteristic visual change as this clay body transitions into the vitreous state we target. That transition happens over a narrow temperature range. Because the raw materials naturally vary in the temperature at which they vitrify, we have to tune the recipe so that the transition happens from cone 5 to cone 6. It is accompanied by a drop in porosity of 2% or more (according to our SHAB test). Talc acts as a catalyst for this change; in this case, only 1% is needed. By itself, talc is refractory. Yet it acts as a flux here! The fact that it can effect this big of a change with only 1% is amazing. Interestingly, this phenomenon only occurs with tiny talc additions.

The mold on the right is PLA filament. Printed at 0.8mm thickness, it only weighs 38g yet is very strong. But it is single-use, needing removal using a heat gun. The TPU flexible mold on the left weighs 62g (the walls are 1.6mm thick). It promises to be multi use but it lacks rigidity and needs a PLA shell to hold the walls vertical. A determined acquaintance printed this for me, it took four attempts. The surface quality is not as good, especially on the top layers.

PLA is a bioplastic, made from renewables. It can potentially be composted. PLA is the most common type of filament used in FDM 3D printing. It has a low melting point, which eases printing and improves interlayer adhesion (but heat resistance of printed products is poor).

Regarding TPU, here is some advice from a follower (who uses a Prusa printer and gets better results than us): "The secret to printing with TPU is constant speed while printing. Under Print Settings, go to Speed. Set them all to 20 mm/s. Ironing will be greyed out unless you have it on. Then, in the next section, Dynamic Overhang Speed, set everything to 20 mm/s. Under Modifiers set First Layer Speed to 20 mm/s. Then under Auto Speed (Advanced), set Max Print Speed to 20 mm/s. This will prevent almost all webbing and other print issues. Some people also suggest reducing the Z-Axis Nozzle Retraction, but I have not found a need to do that."

Pros: -It actually does work well. -Metal construction (plastic foot pedal), bottom panel removes easily. Foot pedal is easy to open and fix. Motor is standard and easy to get. -The wheelhead and pan are similar in size and quality to standard wheels. -Easily purchased online at Amazon or Vevor.com (.ca in Canada). Cons: -Small, too light, be prepared to make leg extensions, a platform or use it tabletop. -Power limits how much clay can be handled, likely 5 lbs or less (for novices, this is less of a limitation). -Not bat pin holes but they could be drilled easily (or other methods of holding bats in place could be used). Understanding the main reason this is so inexpensive is important to appreciate it's limitations. Typical wheels have AC motors with relatively complex electronics to control their speed (these combos are expensive). This wheel employs a stepper motor. These move in tiny, discrete steps and are perfect for things like robots and 3D printers. However, they can be force-fit to continuous motion (by the electronics delivering constant step-pulses). But pulse frequency must be gradually increased and decreased to ensure the motor does not miss any steps. Other issues: Stepper motors exhibit resonance at certain operating speeds (controllers need to move through these zones quickly) and torque changes in a non-linear relationship to speed (top speed is thus limited). Success thus depends on smart electronics to convert the variable voltage from the simple potentiometer in the foot pedal to pulses the motor can handle. It is unclear how repairable this is, more info coming soon.