GreyBird

First go at this. Decided to keep it simple using whiting as the only flux. Nice method, going to be doing many more tests. Worth the 2.5 hours of weighing 
 

If you want the most possible useable glazes out of the grid, then you have to make sure all 4 corners fall within limits. Why run a bunch of tests if half won't be useable because they are out of limits? With glaze calculation software it's simple enough to figure out the 4 corners. The bottom left corner is the glaze with low silica and alumina, one axis increases the silica to the max of its limit, the other increases alumina to the max of its limit. This way every glaze has the potential to be useable.
 
In addition to testing the si:al ratio, I often use the Currie grid for color tests, or to test the effects of increased fluxes in the glaze (whiting on one axis, soda on the other, for example). Again, I make sure all 4 corners are within limits.
 
I also prefer to use vertical test tiles rather than flat tiles. It shows the behavior of the glaze much better, especially since 95% of the pots I make are not plates. It's not as fast as doing the large flat tile, but it saves a couple of rounds of testing in trying to get the melt in control.
 
It's a lot of work, but there's no better method to get a lot of great results at once.

I decided to have a go at this 35 grid method. I am a little confused as to what I am meant to put in on the calculator on his website. Do all the flux have to add up to 100?
 
Made myself a plaster mould with all the squares to hopefully make my life easier.