CraftWEB Hot Glass Talk  

Go Back   CraftWEB Hot Glass Talk > Hot Glass > General Hot Glass Discussion

Reply
 
Thread Tools Display Modes
  #1  
Old 06-07-2019, 10:33 PM
Marty Kremer Marty Kremer is offline
Registered User
 
Join Date: May 2004
Location: North Yarmouth ME
Posts: 459
Marty Kremer is on a distinguished road
help with slumping ⅛" float

I'm trying to get a consistent product for a lighting designer- a simple 3.5" drop through a round 18" ID steel ring supported on bricks.
I've got the flange and the drop ring right, the refractory between the glass and steel right, I think I've got the schedule right (3 hrs to 1325, hold and watch the drop, anneal)
BUT
I sometimes get perfectly smooth domes and sometimes get these weird wrinkles in the glass (same shape, same schedule, same drop, same run in the same kiln). I'll put 3 in the kiln at a time and get 2 perfect and one wrinkled. Placement in the kiln doesn't matter- the heat's even.

Any thoughts? Would tin-side up matter?
Reply With Quote
  #2  
Old 06-08-2019, 03:46 AM
Steve Beckwith Steve Beckwith is offline
Registered User
 
Join Date: Feb 2007
Location: Cocoa Beach, Florida
Posts: 88
Steve Beckwith is on a distinguished road
You can distinguish the difference between the tin side and the non tin side without special equipment. Clean the glass then wet your finger with water and make a smear on both sides. Look carefully at the edges of the smears, the edges of the smear on the tin side will appear to break up. I don't know if it would make a difference in your slumping or not but it might be that the tin side up (or down) may make a difference in the way your glass slumps.

Last edited by Steve Beckwith; 06-08-2019 at 03:49 AM.
Reply With Quote
  #3  
Old 06-08-2019, 04:52 PM
Tom Fuhrman Tom Fuhrman is offline
Registered User
 
Join Date: Apr 2002
Location: hills of Tennessee
Posts: 1,396
Tom Fuhrman is on a distinguished road
Marty, check with Barbara Cashman, she is the administer of the float glass fusers on Facebook which has over 1000 members. She has a lot of experience at using float. Tell her I sent you, she's an old frined.
Reply With Quote
  #4  
Old 06-08-2019, 05:11 PM
Rick Wilton Rick Wilton is offline
Registered User
 
Join Date: Oct 2005
Location: Calgary, Alberta Canada
Posts: 199
Rick Wilton is on a distinguished road
Hey Marty,

It's 100% a tin issue, tin side up will compress the tin and cause issues. Tin side down will work better. As for tin detection you can buy a shortwave uv bulb (aka germicidal) on amazon for not too much money. Be careful with these bulbs as you can "sun burn" (welders arc) your eyes if you stare too long at the bulb.
Reply With Quote
  #5  
Old 06-08-2019, 06:26 PM
Marty Kremer Marty Kremer is offline
Registered User
 
Join Date: May 2004
Location: North Yarmouth ME
Posts: 459
Marty Kremer is on a distinguished road
Thanks everyone! Tom- I knew Barbara from when warmglass.com was important (for fusers), I'll give her a shout.
Reply With Quote
  #6  
Old 06-09-2019, 11:44 AM
Charles Friedman Charles Friedman is offline
Registered User
 
Join Date: Apr 2002
Location: Seattle Wa
Posts: 569
Charles Friedman is on a distinguished road
To find the tin side...Place a coin, on edge, onto the glass. Look at the coin where it meets the glass. If the coin reflects back, at that point, it is the tin side. If there is a gap between the coin and the reflection, than it is the reverse side.
__________________
"Glass will save the world from ourselfs" CharlesF
Reply With Quote
  #7  
Old 06-09-2019, 02:14 PM
Rosanna Gusler Rosanna Gusler is offline
Registered Fuser
 
Join Date: Mar 2003
Location: Wanchese, NC
Posts: 933
Rosanna Gusler is on a distinguished road
tin issue for sure. get yourself a cheap uv light takes an instant to get it right.
Reply With Quote
  #8  
Old 06-09-2019, 10:07 PM
Marty Kremer Marty Kremer is offline
Registered User
 
Join Date: May 2004
Location: North Yarmouth ME
Posts: 459
Marty Kremer is on a distinguished road
Hey Rosanna- I'll get one. Thinking about you every now and then for 2 reasons- I'm building an 18' cedar strip kayak from scratch and need you here for disguising the dings.
The second time is whenever I soak fish in beer before cooking it- your trick.

Bert Weiss is in the 'hood (my new digs near Portland ME), Ron Digitry also. Not a lot of glass action but I'm trying to goose it a bit.
Hope all's well with you.
Reply With Quote
  #9  
Old 06-09-2019, 11:00 PM
Rick Wilton Rick Wilton is offline
Registered User
 
Join Date: Oct 2005
Location: Calgary, Alberta Canada
Posts: 199
Rick Wilton is on a distinguished road
Tin is invisible, I believe you are think about irid.

Quote:
Originally Posted by Charles Friedman View Post
To find the tin side...Place a coin, on edge, onto the glass. Look at the coin where it meets the glass. If the coin reflects back, at that point, it is the tin side. If there is a gap between the coin and the reflection, than it is the reverse side.
Reply With Quote
  #10  
Old 06-10-2019, 12:02 PM
Shawn Everette Shawn Everette is offline
Registered User
 
Join Date: Mar 2013
Location: Indianapolis, IN
Posts: 175
Shawn Everette is on a distinguished road
The tin can sometimes change the characteristics of the reflection, it will come directly off the surface on the tin side, and go through the glass and reflect back on the non tin side. Subtle, but visible at the right angle. It's an irid clear trick too.
Reply With Quote
Reply


Thread Tools
Display Modes

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 Off
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 07:52 PM.


All published comments within these message boards are the opinions of its contributor and does not represent
the opinion(s) of the owner(s) of this website. Please see the Terms of Use file for more details.

Books to Help Artists Avoid Online Scams: Top 10 Email Scams | Social Media Scams

Powered by vBulletin® Version 3.7.2
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
CraftWEB.com. Opportunity Network. 2008. All Rights Reserved.