Lampwork Etc.
 
Mountain Glass Arts

LE Live Chat

Enter Live Chat

No users in chat


Frantz Art Glass & Supply

Beads of Courage


 

Go Back   Lampwork Etc. > Library > Studio

Studio -- Show us your studio setup

Reply
 
Thread Tools
  #1  
Old 2020-06-13, 6:34pm
GlassDoc GlassDoc is offline
Junior Member
 
Join Date: Jun 13, 2020
Posts: 3
Default Kiln is too hot

dug out the kiln. JenKen cube-4.
It ran too hot. rods across kiln furniture would sag.
Called JK, got new thermo-couple...no change.
So now trying to just reset to the new temp.
Any tips for getting the temp right? I've got it set for 860 now as my "new" annealing temp. a 5" soft glass rod will still sag about 1mm when bridging across 2 supports.

any pointers? Anyone had this issue ever?

Laser pointer temperature gun has lots of variation and the temp drops quick when door opens, so not too accurate.


I've been having fun looking for a post answer here but getting lost/distracted in this vast forum.
peace to all.

Ed
Reply With Quote
  #2  
Old 2020-06-13, 9:47pm
KJohn's Avatar
KJohn KJohn is offline
Slogan Challenged...
 
Join Date: Mar 21, 2009
Location: Maricopa, Arizona
Posts: 6,268
Default

Hi Ed!
I just had the same exact problem with my kiln. I just reset the temp a bit lower, but I know it's not exact. The temp for slumping the rods starts at about 1000F, if that helps...so far that's what I've read anyway. What is your info?

I've got mine set at 875, as it was running at least 50 degrees too hot. I'm checking to see if my rods are slumping. They should not slump at all if the kiln is holding the right temperature. Some folks say to use kiln cones, I haven't tried that yet.
Post updates if you want, good luck
__________________
Kristin ~

Facebook:
To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts.

Etsy:
To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts.

Last edited by KJohn; 2020-06-13 at 9:49pm.
Reply With Quote
  #3  
Old 2020-06-14, 7:43am
Eileen's Avatar
Eileen Eileen is offline
Loving learning
 
Join Date: Oct 11, 2010
Location: Florida
Posts: 11,649
Default

Is that Fahrenheit? Can you find a pyrometer you can stick the tip in there to verify?
__________________
My current "hot" fantasy involves a senior discount on glass & tools!
Reply With Quote
  #4  
Old 2020-06-14, 12:09pm
GlassDoc GlassDoc is offline
Junior Member
 
Join Date: Jun 13, 2020
Posts: 3
Default

Thanks for the thoughts Eileen and KJohn.
I think I'm going to have to bite the bullet and buy a pyrometer. So many gizmo's to fix my gizmo's researched and owned already. I'll share what I learn.

I just hope it's running stable and not all spikey and unmanageable.

Reply With Quote
  #5  
Old 2020-06-14, 2:27pm
Speedslug's Avatar
Speedslug Speedslug is offline
Phill
 
Join Date: Mar 21, 2009
Location: Winnebago, MN
Posts: 2,489
Default

You mentioned that you "dug the kiln out", did you make sure that nothing made a home inside the controler?

Small critters are really fond of finding small spots to live in and if they managed to cross a few of the electronic parts on the circuit board with webbing or their own bodies it can radically change they way the controller functions and won't always trip a circuit breaker or blow a fuse.

I know there are red ants that simply love the area around live switches and I have had brown ants attracted to some of the soldering flux left on circuit boards when they leave the factory.

My other thought is to wonder what kind of glass rod you are using in your 'sag test'.
Soft glass in white will melt if you just look at hard for a few minutes while most of the transparent blues I play with need some serious persuasion in the torch flame to get it to flow and even then it will stiffen up if you take your eye off it for a second.

Good luck with finding a fix.

Oh and look for screw contacts getting oxidized after a long time in storage.
I take the screws out and rub them with a pencil eraser to clean off the invisible oxidation layer on the leads and the screw pads if I'm chasing down funky symptoms while troubleshooting electronic systems.
__________________
The Zombie Apocalypse is Upon Us.
Reply With Quote
  #6  
Old 2020-06-20, 9:12am
Shadooba Shadooba is offline
Junior Member
 
Join Date: Jun 20, 2020
Posts: 5
Default

960 is the temp for boro i even run it hotter like 1080
Reply With Quote
  #7  
Old 2021-04-14, 6:23pm
Wndeson Wndeson is offline
Junior Member
 
Join Date: Apr 04, 2021
Posts: 5
Default

I've got mine set at 875, as it was running at least 50 degrees too hot. I'm checking to see if my rods are slumping. They should not slump at all if the kiln is holding the right temperature. Some folks say to use kiln cones, I haven't tried that yet.
Reply With Quote
  #8  
Old 2021-04-14, 7:10pm
Speedslug's Avatar
Speedslug Speedslug is offline
Phill
 
Join Date: Mar 21, 2009
Location: Winnebago, MN
Posts: 2,489
Default

You might want to make sure your work is not too close to the temp sensor.

That can give you all kinds of fun trying to get the temperature reading you are looking for.
__________________
The Zombie Apocalypse is Upon Us.
Reply With Quote
  #9  
Old 2021-04-15, 8:20am
Eileen's Avatar
Eileen Eileen is offline
Loving learning
 
Join Date: Oct 11, 2010
Location: Florida
Posts: 11,649
Default

I hope Ed got it figured out, and hope that if he did he will let us know what happened and what the fix was.
__________________
My current "hot" fantasy involves a senior discount on glass & tools!
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 3:57am.


Powered by vBulletin® Version 3.7.5
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Your IP: 34.236.152.203