Project close to kiln edges

[lmartine]

Hi,

I used the maximum footprint (10 1/4 in x 10 1/4 in) in my kiln (Paragon Fusion 7) to make a chessboard as a gift for Xmas. The corners were within 1.0 to 1.5 cm of the brick walls. There are two 3 mm layers (alternating BE driftwood and clear squares, topped with one sheet of BE green aventurine; I framed this with clear strips). After reading Graham Stone's book, and based on previous posts I read on this board, I came up with the following full fuse schedule to ensure that the glass heats and cools kind of uniformly despite the proximity of the kiln walls.

1 200 1100 60
2 50 1250 60
3 * 1510 15
4 * 900 120
5 25 800 00
6 50 700 00
7 100 600 00

I think that I was conservative enough in both the heating and annealing phases. I must now hand coldwork the surface that was facing down the ceramic board as fiber material stuck to the driftwood pieces, and then I will firepolish it. I want to use:

1 200 1250 30
2 600 1410 10
3 * 900 120
4 25 800 00
5 50 700 00
6 75 600 00

I have a few questions wrt this firepolishing schedule:

1- Is this schedule conservative enough or I should slow even more on the way up?
2- Will the 'marks' due to the ceramic board disappear once the piece is firepolished?
3- Do I need to add devit spray or not?
4- Do I really need to anneal to 600F or I can safely turn the kiln off at 700F?

Cheers!

Lucie

[Laurie Spray]

I am running out the door…..but my first reaction is it is Way too hot. I would not go over 1460 for this. I will read it better later.

[Laurie Spray]

Sorry I responded so quick this morning. I now see that you already fired this. I believe that the reason you had fiber board stick to this is that you fired it too hot on the fuse. Your

second schedule looks fine but I think the last 25 to 800 is slower than necessary.