I have been working the Flow Slab Technique. Just came in from cutting the
slabs into slices, as I continue some of my questions are answered. I wanted
to post photos of my progress.
I was about to finish cleaning up the edges and the piece slipped out of my hands as I was turning it. Then I discovered my finger tips were numb. I sent you the photos within 30 minutes. I could not comment as I was a bit speechless and heartbroken.
To Jennifer – Thank you for your kind words. The uneven stack was approximately 2.2 kg, a little more than the video. My glass cut into strips 2” x 8 1/2”, 30 pieces total, this size was a total guess. The space frame was 18 cm x 26 cm, again very close to the video. The slab seemed thinner than the expected 2 cm. I kept pretty specific notes if you need more information.
Jennifer should stack the glass higher to accommodate the amount of glass needed for her containment footprint for a final block 3cm thick. If it is higher than her dams, she should cut the glass to leave a half inch of space between the dams and her glass stacks. This will allow the glass to flow into the area without overflowing the dams. The glass will just roll into the space and settle out flat into the 3cm slab
If you are designing a final slab to be a specific width, add about an inch to the width when you cast the slab to accommodate for the coldshop. You will need to remove the separator materials from the perimeter of the slab to eliminate any residual primer/fiber from the equation. I generally cut about a half inch off of the slab perimeter to account for this. So if your final part needs to be 5 inches long, cast a block at 6 inches and cut it back to 5 when you are removing the seperators
Feeling returned pretty quickly, thank you for asking. I’m thinking of “Flow Slab Part Dues”. Stay tuned.
Do you have to lengthen the soak at process temperature if your stacks are particularly high?
That is an excellent question about soak times. The short answer is possibly. If you are asking a taller stack of glass to move into a containment system and flatten out it will generally take more time than a shorter stack of the same volume of glass. You’re simply asking the glass to move more. I would recommend being present during the process temperature of the fusing to check on the progress of the casting. The firing schedule we used for the video had a hold time appropriate for the amount of glass laid up in that particular configuration. Changing the variables will affect the amount of time needed to perform this casting function. If you are present during the firing you may find that you may need more time to flatten the slab. Conversely, you may also find you need less time to cast the slab flat in which case you can advance the schedule to annealing before the allotted time is up. This will lessen the cumulative heatwork you are subjecting the glass to.
We recommend documenting the variables of each firing for your records. As you get proficient with different layups you will be better able to predict which hold times to use. A little experience with this process and you’ll find it to be fairly predictable (while still “wowing” customers and fans of your work). On a side note, and as a fun challenge, every time you change the level and placement of the stacks make a little sketch to “guess” what the internal pattern will be. I think after a few slabs you will be able to figure out how to design a block fairly precisely to your design needs.
Have fun and best of luck,
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