Week 6 (Week Beginning 01/03/10)

Looking For Inspiration

Over the weekend while looking for some thing to draw, I came across my sister sketch book which had a couple of pictures of and eroded sandstone rock face. I thought the curves in it were similar to the ones I had been carving in plaster. This is the drawing I did of one of the photos (the images quality isn't very good, my camera was dying when I took the photo).
I found out that the photos were taken in a place in Bridgenorth called the Hermitage. So on the Monday I took a bus to Bridgenorth (not sure why, but it is a nice place) and carved caves into the sand stone. I had been told that the are had been closed off after the caves collapsed about a year ago this was probably why I wasn't able to fine it or see any directions. Any way I managed to find a steep muddy path to a sandstone rock face that had eroded.
Looking at the drawing now it looks a bit like body, might be worth doing some life drawing at some point in the future for my sketch book. Anyway....

Here are some of the photos I took (of Sandstone):


Making Multiples

I've started getting bored of carving shapes I might never use and didn't particularly like so I thought I'd try to cut a shape I was happy with. So using one of the larger triangles I'd cut I used my small arcitectual form to measure out how to make a scaled up version of it but without the corner cut off. I took the piece after soaking it for a while and stated to cut it out on the architectural could get it cleaned up and make a mould of it.
I managed to cut the edges that were at 90 degree angles to each other but there was an angle I had a bit of trouble doing, at first I tried drawing out the kind of angle I would need on the plaster and follow that along but I didn't seem to get it right, and the pieces stated going some odd looking angles so in the end I just went for it with the view if it goes wrong its just plaster and I'm sure I could cast another block of plaster the right kind of size to do it. Not expecting to get it right, Yes! I DID IT! Go me XD I squealed in delight and I'm not too embarrassed to say I did a little happy dance. But, I didn't take a photo of that, I took a photo of the boring plaster polishing smoothing bit *yawn* fortunately I was still in a good mood and I was quite happy just to be at that stage. The image is the soggy plaster piece on a piece of sandblasted glass then I sand it down on the glass by moving it around in a figure of eight motion. Some of the sides didn'tas they were still flat from being cast onto boards, the most challenging bit was the odd angle I had cut, but still it wasn't that wonky and not much trouble to get flat.
Now for the exciting bit mould making but not before soaping, not sure if I've mentioned about soap before if I haven't you should know about it cause it's somethign mould maker/plaster worker should know about, it lubricates the plaster or anything with a porous surface to stop the plaster from sticking to it.When making moulds you should always soap the table where your pouring your plaster to stop it from sticking also. When preparing to make this mould I soaped my model atleast seven times because I really didn't want to ruin my.
The next step after what seemed like it could have been several hours of soaping, I started setting up the boards around the piece. I left two sides flat against a board and the table so they wouldn't be covered with plaster. So when I make more of these triangular models with the mould in plaster or wax I can choose between a large surface to pour into or a smaller.
The boards around the mould were secured with clay and had rope tied around it. I then had to mix 15pints of water and plaster to fill the mould. Unfortunately my mould wasn't strong enough, and the board at the back that the plaster model was resting on slipped away and the wet plaster started to seep out. Lovely Mark (The Plaster Master) came to my rescue, and caught a large amount of the wet plaster in a bucket and poured in in while I held the boards in place, it's a good job 15pints of plaster was a little too much.
Thinking about it now I should have made my mould with the larger surface lying down as the weight of the plaster was too much for the taller boards, and if I had lay the piece down I could have had boards around the piece saving a lot of plaster, silly me.
When I removed the boards after the plaster had dried I found that I had lost the flat surface for the larger side of the triangle and had to carve down the surface with a surform.

The surform is the red tool just at the bottom of the picture, its a great tool for flattening off edges and carving down surfaces and making them look flatter and neater. To take the weight off the piece Mark cut the waste bit of plaster off for me on the band saw (this is probably the most help I've had off Mark ever, I'm not really one to ask for help I just like to get on with things and make my own mistakes, but I'm not against getting a little wisdom form others now and again) I got that surface surformed and tidy up the edges of the mould a little.

I was originally just going to use a board every time I wanted to use this mould to make a model but because the surface wasn't very flat I chose to make a 2 part mould out of it. Before pouring any more plaster on to the mould I made some natches (little indents) in the plaster so when I take a mould off them (to make little lumps) there is a negative of the natches so its easy to locate where to put the 2 halves of the mould together (you can see these little bumps on the images above and below). Next step soap.... When the mould was all soaped up I put boards around it and secured it with clay and rope (didn't really need to rope just after having the earlier spillage I didn't want a repeat). For the other half of the mould I only needed 2 pints of water and plaster

Mould all done and ready to use :)

Just need to remembered to soap it up well when using plaster and giving it a good soak when using wax.

Casting Billets

After giving it some time and though I decided to use clear glass and jade green as the colour for this piece, I came to this disition after looking at some of my glass work from last semester. The odious colour would have been the copper blue but I found a couple of piece where I had used copper wire and I preferred the colour in this, it had a slight tint of green to it and seem more of a natural colour compared to the copper blue. I also thought the copper blue was a bit too bright and I wanted my work to have a calming flowing watery look to it to reflect the wave I had carved out the plaster model.
Using the both billets in the image above was going to be too much glass for this piece so I got the jade green billet cut in half to reduce the weight.
Again I have chosen to a flower pot as a resavwars for my piece. I put the jade green at the bottom of the flower pot and the balanced on top. I want the jade green to be at the tip of the piece and hopefully as the clear starts to flow to the two colours will blend together to make the colour change suttle. I'm not sure if this will happen as this is my first time using the billets. It's a good job this is a rather small piece, the glass for this cost just over £17, compared to about £3 if I were using just clear glassma.
As I would like to make a bigger piece I think its a sensible idea to make a smaller piece to test before jumping into spending loads on something you have no idea how it will work out.

Here is the kiln program I used*:

50 ⁰C/hr → 500 ⁰C → Pass hrs
Full ⁰C/hr → 830 ⁰C → 3.00 hrs
100 ⁰C/hr → 600 ⁰C → Pass
15 ⁰C/hr → 440 ⁰C → 4.00 hrs
10 ⁰C/hr → 360 ⁰C → Pass
20 ⁰C/hr → 310 ⁰C → Pass
50 ⁰C/hr → 21 ⁰C → Pass
End

*To come up with this program I used a chart provided on the gaffer glass website