3D-Printed shell to cast working plaster jigger moldsThe grey outer shell mold on the left was printed in two parts and glued together (at the shoulder). It's vertical split enables me to open it a little. The center model of the outside contour of the mug (on a two-step base) was made by casting the plaster inside another two-piece 3D-printed form I ... more The grey outer shell mold on the left was printed in two parts and glued together (at the shoulder). It's vertical split enables me to open it a little. The center model of the outside contour of the mug (on a two-step base) was made by casting the plaster inside another two-piece 3D-printed form I had made (we had to use a heat-gun and scissors to get the PLA printed form off of that plaster). It smooth the surface on the wheel using a metal rib and trimming tool. Then I stretched a rubber band around the first step at the bottom (because the shell was a little lose-fitting). Now the outer shell mold fits perfectly and clamps tightly in place. To cast a jigger mold it is just a matter of soaping the plaster model and the inside of the shell and pouring in a mix of 1300 pottery plaster and 900 water. Context: 3D-Printing, Jiggering, Casting-Jiggering, 2019 Jiggering-Casting Project Friday 6th December 2019 
The incredible utility of 3D printing master handle moldsThese molds are 3D-printed from PLA filament. They are part of my 2019 year-long casting-jiggering project. A quick soaping, 164g water, 236g plaster and a fifteen minute set produced this plaster mold. It takes time to learn how to soap the masters properly to get optimum quality, but these molds ... more These molds are 3D-printed from PLA filament. They are part of my 2019 year-long casting-jiggering project. A quick soaping, 164g water, 236g plaster and a fifteen minute set produced this plaster mold. It takes time to learn how to soap the masters properly to get optimum quality, but these molds seem to work well regardless. The two halves mate with a tiny amount of play, but it is easy to line them up perfectly (the play actually enables lateral movement that aids in releasing the handle). It is actually easier to cast handles solid rather than pour the slip out, they can be ready to apply in an hour after pouring. The ease of making these molds puts slip casting within much easier reach for potters and small companies. Context: Final cast-jiggered mug beside original 3D-printed mock-up, 3D-Printed master mold, handle mold made in it, first cast, Slip Casting, 3D-Printing, 2019 Jiggering-Casting Project Thursday 5th December 2019 
Fusion 360, my choice for 3D modellingIntimidation by the complexity of this type of software is the biggest obstacle you will face to learning 3D design (for 3D-printing). That being said, the new mission of AutoDesk, the leader in CAD software for 30 years, is to make it easy and universal! Fusion 360 has a lot of advantages. It is a ... more Intimidation by the complexity of this type of software is the biggest obstacle you will face to learning 3D design (for 3D-printing). That being said, the new mission of AutoDesk, the leader in CAD software for 30 years, is to make it easy and universal! Fusion 360 has a lot of advantages. It is a standard. There is a simple learning curve via Tinkercad.com, videos on Youtube, easy online help and many freelancers to hire (at Upwork.com). It is free to qualifying users (teachers, students or people who earn less that $100k/yr), the fact that software of this kind of power and utility is actually available to anyone that wants to try it is amazing. Fusion 360 (and other 3D design products) cannot run 3D printers (3D slicers do that). Fusion 360 is very demanding on the processor and graphics hardware of your computer, typical laptops are not powerful enough. Context: G-Code 3D Printer instructions, Fusion 360 on YouTube , 3D-Printing, 3D Design, 2019 Jiggering-Casting Project Thursday 5th December 2019 
Laguna B-Mix on Steroids: Wedge in some Plainsman Fire-Red!Both pieces have a transparent glaze, G1947U. The Fire-Red (a blend of Plainsman A1/M2 and St. Rose Red) was mixed as a slurry, dewatered to plastic form and then wedged in to the B-Mix (left piece has 10%, the other 20%, the bar in front shows the pure material). The A1 supplies most of the ... more Both pieces have a transparent glaze, G1947U. The Fire-Red (a blend of Plainsman A1/M2 and St. Rose Red) was mixed as a slurry, dewatered to plastic form and then wedged in to the B-Mix (left piece has 10%, the other 20%, the bar in front shows the pure material). The A1 supplies most of the speckle, the St Rose and M2 impart the color. This addition does not affect the working properties of BMix (it still throws very well). An added benefit is that pieces dry better. Fired strength and maturity are minimally affected (porosity stays around 1%). With a 20% addition the surface of the unglazed clay is almost metallic. Silky matte glazes, like G2571A, are stunning on a body like this.
Context: Laguna B-Mix Cone 10R mugs with Alberta and Ravenscrag glazes, Laguna B-Mix, B-Mix+Fireclay with Ravenscrag GR10-A, GR10-C glazes, Reduction Speckle, Reduction Firing Thursday 5th December 2019 
Polish the plaster surface, not the 3D-printed shell-moldThis plaster model was just removed from the 3D-printed shell behind. It dropped out easily (after tapping it at-an-angle on the corners), this worked well despite the resolution lines on the surface. While I could have spent time sanding and smoothing the inside of the shell-mold, it is actually ... more This plaster model was just removed from the 3D-printed shell behind. It dropped out easily (after tapping it at-an-angle on the corners), this worked well despite the resolution lines on the surface. While I could have spent time sanding and smoothing the inside of the shell-mold, it is actually far easier to smooth the surface of the plaster form after extraction. Seconds with a metal rib completely smooths any of the surfaces. And remember, it is easier to remove plaster items cast inside of 3D-printed molds rather than cast around the outside of them. Context: 3D-Printing Thursday 5th December 2019 
A 3D-printed spout greatly increases the utility of this casting moldIt was glued down using the casting slip itself (it stuck in seconds). About ten minutes after draining a fettling knife was run around the inside, then it detached easily. The overhung lip produced imparts structural strength, for drying and firing, to the thin walled piece. This spout has ... more It was glued down using the casting slip itself (it stuck in seconds). About ten minutes after draining a fettling knife was run around the inside, then it detached easily. The overhung lip produced imparts structural strength, for drying and firing, to the thin walled piece. This spout has advantages over the traditional "spare" built in to the upper part of a mold. It enables a one-piece mold. The lip can be more overhung. Draining is cleaner and easier. Molds are lighter. Extraction can be done sooner and it is easier. The spout does not absorb so there is less scrap. The degree of overhang is adjustable by simply printing new spouts. Context: 3D-Printing, Slip Casting Sunday 1st December 2019 
Cooling rate drastically affects the appearance of this glazeThis is G2934Y satin matte with Mason 6600 black stain. The piece on the left was fired using a slow-cool firing schedule (C6DHSC). The schedule for the one on the right turned the kiln off at 2100F (after a half hour drop-from-2200F-and-hold), then it free-fell. The slow cool gives the glaze on the ... more This is G2934Y satin matte with Mason 6600 black stain. The piece on the left was fired using a slow-cool firing schedule (C6DHSC). The schedule for the one on the right turned the kiln off at 2100F (after a half hour drop-from-2200F-and-hold), then it free-fell. The slow cool gives the glaze on the left time to crystallize, thus it is no longer a satin matte. It is interesting that to this mix of the glaze I added 20% glossy clear, yet it still matted on the slow cool. Context: G2934Y - Cone 6 Magnesia Matte Low LOI Version, Matte Glaze Tuesday 26th November 2019 
Why does transparently glazed terra cotta look better at cone 03 than 04?Terra cotta bodies typically develop richer color at cone 03 and fire much stronger. Glazes melt better and thus micro-bubbles pass through easier, this produces better transparency and a more brilliant surface. Notice that crazing is beginning on the one of the left. But because of better ... more Terra cotta bodies typically develop richer color at cone 03 and fire much stronger. Glazes melt better and thus micro-bubbles pass through easier, this produces better transparency and a more brilliant surface. Notice that crazing is beginning on the one of the left. But because of better body:glaze interface and development of better vitrification the one on the right is not crazing. Cone 03 is somewhat of a sweet-spot for this specific body, firing higher begins decomposition processes that generate gases that disrupt the surface. Needless to say, accurate firing is needed to fire at cone 03 with ongoing success. Context: Terra cotta, Vitrification Sunday 24th November 2019 
White stain. Does it work?This is G2934Y matte glaze base with opacifiers added. It has been applied to a dark-burning body to demonstrate the comparative degrees of opacity. The stain is Mason 6700 white. While it does not opacify nearly as well as tin or zircon, it does produce a smoother surface. Context: Opacifier, Opacification, Stain Sunday 24th November 2019 
A gunmetal glaze I have wanted my whole life!After 40+ years of making pottery I finally have a perfect gunmetal black. It has an incredible silky glaze. It does not cutlery mark. It does not craze on anything. It is easy to clean. This is G2934Y with 6% Mason 6600 black stain firing using the PLC6DS schedule. I had to tune it a bit, adding ... more After 40+ years of making pottery I finally have a perfect gunmetal black. It has an incredible silky glaze. It does not cutlery mark. It does not craze on anything. It is easy to clean. This is G2934Y with 6% Mason 6600 black stain firing using the PLC6DS schedule. I had to tune it a bit, adding about 15% glossy G2926B, because it was a little too matte on initial firings. But now it is perfect. These are heavy mugs made using the M340 casting recipe (and the casting-jiggering process). The speckled mug was made by casting a thin layer of the speckled version of the slip first, then filling the mold with the regular slip. I used a 40-minute cast to get walls nice and thick! Context: Gunmetal glaze Sunday 24th November 2019 | Contact Us:
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