Lampwork Etc.
 
Send a PM to CorriDawn!

LE Live Chat

Enter Live Chat

No users in chat


Frantz Art Glass & Supply

Glacial Art Glass


 

Go Back   Lampwork Etc. > Library > Boro Room

Boro Room -- For Boro-related tips, techniques, and questions.

Reply
 
Thread Tools
  #1  
Old 2013-12-02, 5:07am
pattycake pattycake is offline
Senior Member
 
Join Date: Dec 11, 2012
Location: Orlando, fl
Posts: 104
Default ramp down boro speed and temps

I have my kiln set at 1150 or 1160 and had a fast ramp down, have now been told to hold around 950, true? and for how long thanks
maria
Reply With Quote
  #2  
Old 2013-12-02, 7:26am
Bunyip's Avatar
Bunyip Bunyip is offline
Pyromaniac
 
Join Date: Jun 27, 2006
Location: Out there on the interwebs
Posts: 1,784
Default

Based on your "annealing program" I would STRONGLY recommend that you do some research on your own before entering into a forum discussion on annealing. One thing that you can be sure of in a forum discussion is a lot of opinions based on personal experience (oh, and controversy if you're "doing it wrong"). Be sure you have the facts necessary to sort out what will be workable for you and your personal needs.

Both Northstar and Glass alchemy have extremely detailed annealing instructions on their websites. You should read them. In fact, now would be a good time. Here's a link:

http://www.nortelglass.com/downloads...nealChtRev.pdf

Here's another:

http://www.glassalchemy.com/relieving_stress

recommended additional reading: Contemporary Lampworking by Bandhu Scott Dunham

Some basics:

(For clear borosilicate)
•Annealing temperature: 1050 degrees F
•Strain temperature: 960 degrees F

Typically, most manufacturers recommend that you hold Borosilicate glass at annealing temperature for 1 hr per 1/4" of thickness, followed by a "soak" at just below the strain point. That's probably the 950 hold you've been told of. The length of this soak varies according to the thickness and complexity of the piece you are working, generally ranging from 50% to 100% of your annealing time.

Ultimately, once your piece has been properly annealed, your choice of ramp down and soak times becomes a matter of personal risk tolerance. Some people anneal and then crash the kiln. They do run the risk of thermally shocking the piece, which can lead to damage, but it usually works out fine and the piece is not any less annealed than it would be otherwise.

Others subscribe to a multi-hour regime of controlled cooling. This is fine too. In the case of large pieces like telescope reflectors, where thousands, even millions of dollars can be riding on safely cooling the piece, many months may be spent in cooling phases.
__________________
Chris Scala

Fortune Cookie say, "When things go wrong, don't go with them!"

Current Glass-Melting Apparatus:
GTT Lynx powered by 2 5 LPM Oxycons and
a sexy Barracuda running pure tanked Oxy
Reply With Quote
  #3  
Old 2013-12-02, 7:34am
pattycake pattycake is offline
Senior Member
 
Join Date: Dec 11, 2012
Location: Orlando, fl
Posts: 104
Default

big thank you, and I will ask the man I just took a boro workshop with, he isthe one who memtioned it but I did not get to get the complete information, again thank you
Reply With Quote
  #4  
Old 2013-12-02, 8:35am
Eileen's Avatar
Eileen Eileen is offline
Loving learning
 
Join Date: Oct 11, 2010
Location: Florida
Posts: 11,650
Default

I wanted to say thank you too, as I'm just starting to play with boro, and made a few icicles I want to anneal and also make more.
__________________
My current "hot" fantasy involves a senior discount on glass & tools!
Reply With Quote
  #5  
Old 2013-12-02, 11:03am
pattycake pattycake is offline
Senior Member
 
Join Date: Dec 11, 2012
Location: Orlando, fl
Posts: 104
Default

another fun Christmas idea for a necklace or on the tree is a candy cane. I use white and red, twiste, heat one end so it curves, add a bit of clear, ream it out for a hole, ta da, easy peasy
Reply With Quote
  #6  
Old 2013-12-02, 12:39pm
Bunyip's Avatar
Bunyip Bunyip is offline
Pyromaniac
 
Join Date: Jun 27, 2006
Location: Out there on the interwebs
Posts: 1,784
Default

You're very welcome! I know I agonized over annealing programs for a long time before settling on a few that work for most of my glass. Talking with the gentleman you worked with is a great first step. Do you mind if I ask who that was? I live in FL as well, and needless to say I am always looking for glassy resources & like-minded people.

Good luck to you!
__________________
Chris Scala

Fortune Cookie say, "When things go wrong, don't go with them!"

Current Glass-Melting Apparatus:
GTT Lynx powered by 2 5 LPM Oxycons and
a sexy Barracuda running pure tanked Oxy
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump




All times are GMT -7. The time now is 1:55am.


Powered by vBulletin® Version 3.7.5
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Your IP: 3.238.114.5