2 large air bubbles

[nansea121]

I would never have guessed to ramp down and then back up again during the annealing stage.

[Becki]

1. 200C/hr (360°F/hr)     to 650C (1202°F),    soak for 30 mins
2. 300C/hr (540°F/hr)     to 790, (1454°F)      soak 10 mins
3. skip/afap (9999°F/hr)  to 510, (950°F)        soak 30 mins
4. 80C/hr (144°F/hr)       to 370C, (698°F)      no soak
5. 200C/hr (360°F/hr)     to 100, (212°F)        no soak
    off.
Stephen

So the suggestion here is to ramp down in the 4th segment and then ramp up in the 5th segment.

What about reversing the 4th and 5th segments around so it can ramp down and then ramp down again a second time?

I would never have guessed to ramp down and then back up again during the annealing stage.

You're not.  Look at the schedule. You're going at a rate of 9999F to the anneal temp of 950 degrees, Segment 4 is a rate of 144F to the strain point or below then Segment 5 at a rate of 200F to the temperature of 212F. Your rate of ramp down goes up but your temperature is constantly going down.

[nansea121]

1. 200C/hr (360°F/hr)     to 650C (1202°F),    soak for 30 mins
2. 300C/hr (540°F/hr)     to 790, (1454°F)      soak 10 mins
3. skip/afap (9999°F/hr)  to 510, (950°F)        soak 30 mins
4. 80C/hr (144°F/hr)       to 370C, (698°F)      no soak
5. 200C/hr (360°F/hr)     to 100, (212°F)        no soak
    off.
Stephen

So the suggestion here is to ramp down in the 4th segment and then ramp up in the 5th segment.

What about reversing the 4th and 5th segments around so it can ramp down and then ramp down again a second time?

I would never have guessed to ramp down and then back up again during the annealing stage.

You're not.  Look at the schedule. You're going at a rate of 9999F to the anneal temp of 950 degrees, Segment 4 is a rate of 144F to the strain point or below then Segment 5 at a rate of 200F to the temperature of 212F. Your rate of ramp down goes up but your temperature is constantly going down.

I did look at the schedule.
I read it as ramping down at a rate of 144°F in seg.4 and then ramping up at a rate of 360°F in the fifth segment.  

That's what I meant when I said that I would never have guessed that you would ramp down and then back up again before the schedule was finished.


 

[nansea121]

Your rate of ramp down goes up but your temperature is constantly going down.

I think that helps me to understand this better. Even though the rate is set to go back up in the 5th segment, the temp is still going down. So the ramp/rate is the speed that happens in the 4th & 5th segment before the kiln shuts off.

[Ian]

Nancy
In the 4th segment the temp is coming DOWN from 950f to 698f at a RATE of 144f per hour
In the 5th segment the temp is coming DOWN from 698f to 212f at a RATE of 360f per hour
The rate IS NOT SET TO GO BACK UP in the 5th segment the rate in the 5th segment is set to to drop the temp down faster in the 5th segment
Regards
Ian

[Stephen Richard]

It may be easier to understand if you make a graph of the firing schedule.
When you do you will get a "cliff" with a couple of "shelves" on the left hand side of the mountain.  On the right hand side, you get a really steep "cllif" to a broad "shelf", followed by a gentle slope and then a rapid drop as you come back to the bottom of the mountain.

Better yet put it on graph paper, or convert the rates to time.  All of these help to visualise what the numbers mean.


Stephen

P.s.  This assumes that time is moving from left to right.
s

[Judy K]

Nancy,

You and I are visual learners, so try this.

I use this chart from Paragon when I fire a new experiment. I log the numbers into the chart and then I check to see if the kiln actually does what I logged in and what happens to the glass at what temps. Then I make notes all over the thing. It really helped me get comfortable with my programing, because I could see the curve of the heating and cooling.
http://www.paragonweb.com/files/manuals/Firing_Records.pdf

This is a great set of notes from Bullseye that explains what happens to glass as it heats.
Page seven shows one of these graphs in it's basic sense. Plot your own programs on the chart above and they will look similar.
http://www.jimbolesdesigns.com/eyeCandy/introKilnForming/PDF/heatANDglass.pdf

Hope this helps.

[Becki]

That's exactly why I suggested you look at the graph in Brenda's book!

[nansea121]

Sorry Becki. I didn't get a chance to look at her book. I'm in the middle of working on another lamp commission. I've been stepping back and forth into here to see if I could figure this out.


A graph is an excellent idea!!!!! Thank you Stephen for the gentle visual. I'll certainly give that a try.
Logging each step on an hourly basis, Judy...mmm. I do that anyway in my book, but a graph would be way more visual. Thank you!

You're right Judy, I'm a very visual learner. My late husband was the other way around. What a smart cookie he was.
My apologies if it seems like it was taking abit of time for the information to sink in.

Thanks everyone.

[nansea121]

Nancy
In the 4th segment the temp is coming DOWN from 950f to 698f at a RATE of 144f per hour
In the 5th segment the temp is coming DOWN from 698f to 212f at a RATE of 360f per hour
The rate IS NOT SET TO GO BACK UP in the 5th segment the rate in the 5th segment is set to to drop the temp down faster in the 5th segment
Regards
Ian

Thank you Ian for your explainations. They helped to make a better picture for me.
Dan loves that converter by the way:)

[Kev]

Here is what your schedule would look like as a graph.

[nansea121]

Here is what your schedule would look like as a graph.

I see the graph part and was able to zoom the whole thing up to sort of read the fine print. Are those red vertical lines in the chart the segments? If so, that's a really good idea!
Can you send that pic to me by email? Maybe it will show up clearer that way from this end.
Thanks Kev.

[Kev]

The red lines indicate the end of one segment leading into the next...this is divided into the 5 segments you had posted. The text under it was merely the schedule you posted, but you can visualize the what is going on with the temp within each segment of the schedule, buy following the blue line.

[nansea121]

Thanks Kev.

[nansea121]

That's exactly why I suggested you look at the graph in Brenda's book!

I found that graph m'dear:)
It's in Kiln-Formed Glass by Brenda Griffith on page 44 if anyone else has that book and would like to see it.

I love the graph idea and that one shows another really nice example.

Thank you Becki:)

A friend told me yesterday that one day, this kiln figuring out will come as second nature.
Each step forward brings me closer to that goal.