Today I got my crochet bowls back from the kiln. I am very happy with the glazes and certain elements of them. I like how they have transformed from CAD into something organic and handmade.
I have made one big mistake in the making of these and that is that I used porcelain with a much lower firing temperature glaze. The result of this is that over time the glazes will crack. Next time I will be buying in some earthen wear slip to try and this should stop them breaking.
I finally got my shot glasses back from their third and final firing. Again they are a little smaller than I had hoped . Some are more useable than others but I have enough for a collection. I am really happy with the finish on the glaze with the final green added. It gives the pieces individuality and makes then feel more organic.
I am also really happy with the way the detailing from the rough print has came out in contrast to the smoother mold printed.
Over the last few weeks I have been having problems with the goblets bending at the stem and touching other items in the kiln. Although I gave a few of them a knock and they came apart they are imperfect and I plan to redesign the whole thing.
The pint tumblers are working out great. I have a perfect set of four now and a few more in the process of making.
Today I got back my shot glasses from their first glaze firing. I have painted them all with the green glaze I bought and tested a few months ago. I decided to paint them all different to each other so that when they are being used people know which one is their glass.
I am still not having a lot of luck with the wine goblets. The one that I tested last I left to dry before cleaning up to see if it holds together better. When I came to clean it up I noticed it had a slight lean and a small crack at the bottom of the stem. It is still in tact and I have put it in to bisque fire however I am not very hopeful and I plan to redesign the whole goblet and start again to make it stronger.
On the plus side I got back two more pint glasses which I glazed today. I am very please with how these are working out and I will soon have a set.
The plan that I came up with yesterday to leave the goblet alone to dry is so far working. It was still standing after four hours so I am keeping my fingers crossed that this approach will work.
I also managed to cast another pint tumbler today. I am starting to become really quick at these. They cast like a dream, are easy to take out of the mold and are also very quick to clean up as they only have two seams. The following image also shows the goblet I made on Monday which is also cracked at the stem.
This afternoon I got all my shot glasses from the bisque firing as well as one of the pint glasses. I glazed these with clear porcelain glaze. I plan to fire for a third time with the green glass I used for my test pieces. I dipped all the vessels into the glaze and then touched up where my finger prints were with a paint brush. Afterwards I removed the glaze from the underneath by rubbing them on a wet carpet.
Shot glasses after bisque firing.
Vessels after glazing and painting over finger prints.
Today I was able to take my first goblet finished sample finished with a tin glaze Out the kiln. I was very happy to see it standing, despite cracking at the base of the stem several times. I was fairly happy with the finish however parts of the glaze hadn’t stuck because I should have stirred it a little longer. I will sample more before choosing my final finish.
I also managed to get my 3rd goblet out of the mold today. I cut this to the edges at the top to the edge of the glass as apposed to round in my first sample.
So that the stem didn’t break I cleaned up most of the vessel whilst it was in partial parts of the mold to support it. This approach worked very effectively. The stem only wobbled slightly when I was putting the finishing touches to the piece.
I finished of cleaning up this piece with a wet sponge which made this piece far neater than my previous two samples. I feel that I am now heading towards the quality I am aiming for in my final pieces.
This afternoon I have been building a 3D model of a design for a drinking tumbler. Because of the height of the piece I will find this hard to press from a mould so I am going to try and slip cast this along side the wine goblets. The CAD model is just over 16cm which I am hoping will give a good size after taking into account shrinkage during the firing process.
I am going for a similar design to my whisky glasses as I wish for the same theme to run through out the collection that will be used in my kitchen. These pieces will be smooth all over as apposed to the whisky vessels which have texture down one side.
Today I have been trying out the press mold for my whisky glasses. The first few I did were a little floored but the more I made the better they became. My 3D printed chizel was perfect for cutting off the excess clay from the top of the mold. I was keen to see the effect of using molds printed on different machines. The mold from the ultimaker gave a much smoother finish to the pieces. I like the effect of the two contrasting textures.
Close up showing both textures in the clay.
Selection I have made so far.
Some of the vessels came out with areas that were not smooth. I found placing the clay back into the molds and pressing them again sorted out this problem.
Mold before use.
Clay pressed into the mold.
Clay cut with 3D printed chisel.
To speed up the drying process I used my hair dryer. This worked well for the clay but warped the outside of the orange mold slightly with the heat. The inside seems to not have been effected which is good.
Clay smoothed down and drying also showing warped mold.
I have got my bowls back from the bisque firing. Some of them are looking good. Two are a little wonky due to both using the clay too thinly as well as the mold being made from plastic not plaster. I am going to Glaze them on Monday so I hope they work out in the next firing.