Last week I posted that I ran a clear wine bottle slump onto my ceramic pattern mold and it cracked
I ran the cycle that worked perfectly when my studio was about 65 - 70 F from 6:15am
thinking that the cool down late at night caused the cracking - was about 55F when I went in to see the next morning - hmmmmmmmmmmm
I had a suggestion from Rose Mary Clay to adjust my schedule and add further cool down - so that it was slower -
Before I did that I ran another Green Bottle slump on my ceramic patter from night to morning - thinking the day would be warmer - same temps around 50-55 F
NOPE - it cracked - even more - but I did notice it was sticking more to the mold
hmmmmmmmmmmmmmmmmmmm
On the weekend I warmed up the studio by turning on the heat friday night and putting another wine bottle on - a clear (not that it really matters
changed the cycle since it was warm to sit and do in the stuido so that I added another couple of segments and time for holding -
so excited saturday afternoon- to open and it was again cracked - hmmmmmmmmmmmmmmmm
noticed again harder to get pieces off - I cleaned and sprayed the Boron on for every firing - thinking maybe not enough
so now I need to do a slump WITHOUT the pattern mold and straight onto the kiln shelf with kiln fiber
I had turned off the heat last night - so the building cooled down to about 45F this morning - and
Voila - the bottle was fine -
so .........
I need to double check how much boron is actually getting onto my ceramic mold - am I possibly not getting enough on (I've made about 10 with no problem - with one only the weekend before the trouble )
it also could be the glass being fine on expansion but the ceramic piece not expanding and contracting in the cold the same -
any way - had fun - cleaning the studio - moving things around - bringing the last of the electronics - liquids down to the house for winter - I'll only take things up and put on heat when it might be sunny weekend and it helps heat the studio
I'll need to clean up the basement studio so I can at least torch
got a great haul of bottles on the weekend
10 clear wine bottles and some more of the green glass sparkling water bottles and a cool liquor bottle
these are the wine bottles I bought - got 48 of the 1L (left ) and 96 of the 750ml (right)
and deciding on the next kiln
either a pargaon 19CSD (double opening ) or go for the 26"
I am thinking the 19 for the next intermediate then I'll go for the BIG kiln