Diana Ferreira Posted April 29, 2012 Report Share Posted April 29, 2012 I have wanted to make hollow bowls for some time. But there is always something that is more urgent and a deposit has been paid for said work so this just got pushed into the back of the line. In the beginning of March I made the plaster molds, and yet again no time to focus on it. But a week ago I decided that is it! I released the molds from the masters and casted the first and only one. I was scared. I am very anylitical and knows how many things can go wrong. And after I made the molds I realised that the dimensions were all out. But, I've got the mold, and used it. Anyway, here is the result: Black hollow bowl with a white glaze Link to comment Share on other sites More sharing options...
Chris Campbell Posted April 29, 2012 Report Share Posted April 29, 2012 Congratulations on pushing through and getting it done ... it is sometimes a weird and background fear that keeps us from doing the new, fun stuff. Let us see images as you progress through designs! Link to comment Share on other sites More sharing options...
Marcia Selsor Posted April 29, 2012 Report Share Posted April 29, 2012 Very nice. Are you casting with a black slip? Marcia Link to comment Share on other sites More sharing options...
OffCenter Posted April 29, 2012 Report Share Posted April 29, 2012 Nice! Link to comment Share on other sites More sharing options...
Diana Ferreira Posted April 29, 2012 Author Report Share Posted April 29, 2012 Marcia, yes (and thank you :-). I use a black slip that my supplier makes up for me. Shrinkage is about 17%. thank you Offcentre Link to comment Share on other sites More sharing options...
Matt Oz Posted April 29, 2012 Report Share Posted April 29, 2012 Looks good, nice contrast. Is black slip expensive? Link to comment Share on other sites More sharing options...
INYA Posted April 29, 2012 Report Share Posted April 29, 2012 Looks great! I know how many things can go wrong... Have you heard for "Molduct tubing"? I have found this old link: http://www.ceramicartdaily.net/booksales/StudioCerHanazonoExcerpt.pdf even ordered some but never had the time... btw have you maybe managed to check porcelain firing? Link to comment Share on other sites More sharing options...
Diana Ferreira Posted April 29, 2012 Author Report Share Posted April 29, 2012 Oh Damn, Inya! I have forgotten! But I promise that I will do so tomorrow - making a note on my phone :-) Sincere apologies. I have seen that tutorial, and my ex do have some of the tape. But the slip that I use takes for ever to dry when it is completely enclosed in plaster. So my approach with this bowl was a bit different :-) (I even cast my plates into an open mold and decast after a set time. I do not add footrings to any of my work, hate them!) Matt, I do not think that it is more expensive than stoneware. It is definitely much cheaper than porcelain slip :-) Because of the metal content in the clay, it is quite naughty. Blisters easily if fired a few degrees to high. It squats easily during a glaze firing. And the range where the body turns black is quite narrow (till it blisters). But, this is a local product I use. I do not know if all black clay bodies do this :-) My slip says earthenware, but I fire it close to stoneware temp to get it to go black black. Link to comment Share on other sites More sharing options...
SmartsyArtsy Posted April 29, 2012 Report Share Posted April 29, 2012 They look very nice. How large are they? I don't know much about hollow forms but it would make sense to me to use the technique forgot beverage tumblers. Link to comment Share on other sites More sharing options...
Diana Ferreira Posted April 29, 2012 Author Report Share Posted April 29, 2012 Hi Chris, I know what you are talking about. Those insulating tumblers. That is on the agenda ... But again - it is difficult to release certain shapes, or you can get cracking as the clay starts to shrink before it releases from the mold. The clay I use is very soft even when it is loose in the mold, and I normally need to rest if for longer inside a mold, shrinking and hardening more before i remove it. This bowl is 12 cm x 7 cm and the rim is 3 cm wide. Link to comment Share on other sites More sharing options...
yedrow Posted April 30, 2012 Report Share Posted April 30, 2012 Very nice work! Link to comment Share on other sites More sharing options...
INYA Posted April 30, 2012 Report Share Posted April 30, 2012 no footrings, that is interesting why? I am not a fan either but I thought I am the only one. I heard so many times that they are a must for various reasons Link to comment Share on other sites More sharing options...
Diana Ferreira Posted May 1, 2012 Author Report Share Posted May 1, 2012 My ex, who is a modeller and works for a large ceramic company in our city hates the fact that I refuse footrings. There is lots of reasons. Glaze a piece completely, but the footring is clean, and the glaze does not stick to the shelve. A piece with a footring will wobble less (well, it is supposed to wobble less if the mold is a good one). Your piece will not scrape the table and damage it if have a footring. Well, i sand my work at bisque and after the glaze firing so it is smooth. I just really hate footrings. I almost never glaze the outsides of my work, so I have no problems with glaze sticking to the shelves. And my clay slumps a bit in the kiln, so it lays flat (where I want it to lay flat!) AND, I really really hate the ring it forms inside a cup or bowl. I use 1 part molds for my plates, so i will have to manually fill that ring if my plates had a ring. And my plates will slump a bit in the centre, which I would not be happy with. I am glad there is someone else who does not like it :-) Rules, what rules? hehehehe Link to comment Share on other sites More sharing options...
Diana Ferreira Posted May 1, 2012 Author Report Share Posted May 1, 2012 Forgot to add: I started making molds this past weekend (we had a super-long 5 day weekend :-) to make another hollow bowl with dimensions that I will be happier with. one more master to cut, but I am low on plaster :-( Link to comment Share on other sites More sharing options...
Karen B Posted May 1, 2012 Report Share Posted May 1, 2012 Looks great! I know how many things can go wrong... Have you heard for "Molduct tubing"? I have found this old link: http://www.ceramicar...zonoExcerpt.pdf even ordered some but never had the time... btw have you maybe managed to check porcelain firing? Most amazing article. So much patience. Thanks for posting. Link to comment Share on other sites More sharing options...
INYA Posted May 2, 2012 Report Share Posted May 2, 2012 I don`t like the rings that are formed inside too and I heard all the reasons why I should have footrings... I am glazing outside but I only use one good tested glaze and I am rather spending time wiping it off or using wax. Anyway you have to wipe it off the ring also and it is not a piece of cake -for me it is the same you have a line ring/side or flat bottom/side. by Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.