CraftWEB Hot Glass Talk  

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

Reply
 
Thread Tools Display Modes
  #226  
Old 04-19-2011, 09:37 AM
Brian Wong Shui Brian Wong Shui is offline
Registered User
 
Join Date: Oct 2002
Location: Atlanta, GA
Posts: 183
Brian Wong Shui is on a distinguished road
Quote:
Originally Posted by Lawrence Duckworth View Post
There is one inch of insulation covering the ceramic/metal clamps. In the duckbill photos I have it appears to me to be covered in dip also... Its not a problem to cut the insulation out of the way if you guys think leaving them covered is a disadvantage.
Lawrence,

It isn't covered. The frax is right up to the edge of the brick. We use diplag to hold everything together. Cool the elements. Don't bore the bricks too tight. Things expand.

--Brian

--Brian
Reply With Quote
  #227  
Old 04-19-2011, 10:58 AM
Lawrence Duckworth Lawrence Duckworth is offline
Registered User
 
Join Date: Mar 2010
Location: Gainesville, GA
Posts: 685
Lawrence Duckworth is on a distinguished road
Thanks Brian
I reamed the brick with a half inch all thread rod to give some breathing room....might have been over kill
Reply With Quote
  #228  
Old 04-19-2011, 07:14 PM
Pete VanderLaan's Avatar
Pete VanderLaan Pete VanderLaan is offline
The Old Gaffer
 
Join Date: Apr 2002
Location: Chocorua New Hampshire
Posts: 22,033
Pete VanderLaan is on a distinguished road
You have to make sure that the clamp is tight though. I had an element slip through the clamp on my first furnace and it dropped down and touched the pot. That proved to be pretty exciting when I had been gathering all morning and saw the contact. That furnace did not have a door kill switch. Nothing happened. You just don't conduct below 50 volts.
__________________
Where are we going and why am I in this basket?
Reply With Quote
  #229  
Old 04-19-2011, 08:05 PM
Kenny Pieper Kenny Pieper is offline
Registered User
 
Join Date: Feb 2003
Location: Burnsville N.C.
Posts: 838
Kenny Pieper is on a distinguished road
So do you really need a door kill switch?



Quote:
Originally Posted by Pete VanderLaan View Post
You have to make sure that the clamp is tight though. I had an element slip through the clamp on my first furnace and it dropped down and touched the pot. That proved to be pretty exciting when I had been gathering all morning and saw the contact. That furnace did not have a door kill switch. Nothing happened. You just don't conduct below 50 volts.
Reply With Quote
  #230  
Old 04-19-2011, 08:21 PM
Julian Duerksen Julian Duerksen is offline
Registered User
 
Join Date: Jul 2008
Location: Vancouver, Canada
Posts: 6
Julian Duerksen is on a distinguished road
pot height

I am replacing the pot in my #300 molly and I am wondering what the best height is for the pot in relation with the rim to the sill. Previously the rim of the pot was about an inch bellow the sill. With the bricks I have I can go with two inches below the sill or with the lip of the pot almost level with the sill. Will it be harder on the pot the closer the rim is to the sill and the elements? How close can the elements be to the rim of the pot?
Reply With Quote
  #231  
Old 04-20-2011, 06:46 AM
Pete VanderLaan's Avatar
Pete VanderLaan Pete VanderLaan is offline
The Old Gaffer
 
Join Date: Apr 2002
Location: Chocorua New Hampshire
Posts: 22,033
Pete VanderLaan is on a distinguished road
I would never advocate for not having a kill switch ( what an appropriate name for it). I am simply telling you what happened to me when I made contact with the crucible while it in turn was touching the element live. There is such a thing as liability.

On my existing furnace, if you open the door far enough, it makes the kill switch roll over and the furnace goes live again, which I find useful in my continuing mistreatment of this great tool. I was over at Josh Biernbaums studio in Vermont yesterday and was amazed to see how clean his moly is. Mine on the other hand has crap all over it, a sticky door, and generally looks pretty trashed, sort of like the rest of my shop. Josh's is pristine.

As to the crucible, I don't like it getting closer than one inch from the lip. I do think that the torch heat up through the clean out will help enormously on any size pot.

I really have to clean up that glass I spilled in December...
__________________
Where are we going and why am I in this basket?
Reply With Quote
  #232  
Old 04-20-2011, 11:07 AM
Lawrence Duckworth Lawrence Duckworth is offline
Registered User
 
Join Date: Mar 2010
Location: Gainesville, GA
Posts: 685
Lawrence Duckworth is on a distinguished road
Well I'm in a holding pattern till I get an electrical parts list and a plan of attack .

I ended up using a fire blanket to cap the insulation. Hope it works,, they have a melt temp of 1000

Oh yeah, I did put another quarter turn on the clamps

Last edited by Lawrence Duckworth; 03-03-2014 at 05:41 AM.
Reply With Quote
  #233  
Old 04-22-2011, 07:18 AM
Lawrence Duckworth Lawrence Duckworth is offline
Registered User
 
Join Date: Mar 2010
Location: Gainesville, GA
Posts: 685
Lawrence Duckworth is on a distinguished road
Quote:
Originally Posted by Julian Duerksen View Post
I am replacing the pot in my #300 molly and I am wondering what the best height is for the pot in relation with the rim to the sill. Previously the rim of the pot was about an inch bellow the sill. With the bricks I have I can go with two inches below the sill or with the lip of the pot almost level with the sill. Will it be harder on the pot the closer the rim is to the sill and the elements? How close can the elements be to the rim of the pot?
Based on the drawings I've seen there should be a brick or something to elevate the pot, but that would put mine too high so I spread a bit of sand under t o lift and help hold it from rocking . I'd say the pot is about an inch below the sill.

Last edited by Lawrence Duckworth; 03-03-2014 at 05:41 AM.
Reply With Quote
  #234  
Old 04-22-2011, 10:59 AM
Charles Friedman Charles Friedman is offline
Registered User
 
Join Date: Apr 2002
Location: Seattle Wa
Posts: 590
Charles Friedman is on a distinguished road
Quote:
Originally Posted by Lawrence Duckworth View Post
Well I'm in a holding pattern till I get an electrical parts list and a plan of attack .

I ended up using a fire blanket to cap the insulation. Hope it works,, they have a melt temp of 1000

Oh yeah, I did put another quarter turn on the clamps

Lawrence, That top looks beautiful, outstanding job on the whole build!

Would using a torque wrench be of use at this point?
__________________
"Glass will save the world from ourselfs" CharlesF
Reply With Quote
  #235  
Old 04-22-2011, 08:22 PM
Lawrence Duckworth Lawrence Duckworth is offline
Registered User
 
Join Date: Mar 2010
Location: Gainesville, GA
Posts: 685
Lawrence Duckworth is on a distinguished road
Thanks Charlie, but itz a bit to early to be celebrating the furnace….needs to get wired and melt some glass first.
So far though its been good and from building this thing its become purdy clear that a lot of thought was given to the design....so ya gotta kinda tip yer cap to the cat that did the castings, design and development work on these things.

Btw I tried finding torque specs on the clamps but couldn't.. so I decided to just tighten them till i heard the ceramics start to groan
Reply With Quote
  #236  
Old 04-25-2011, 03:41 PM
Scott Novota's Avatar
Scott Novota Scott Novota is offline
AbbyNormal User
 
Join Date: Jan 2004
Location: Pensacola Florida
Posts: 2,160
Scott Novota is on a distinguished road
Lawrence,

I find your whole journey very interesting. From the building to the equipment it has been fun to watch.

I am sure everyone here, even those that think you might have done it anouther way here or there, will be toasting your success come opening day.

Always looking forward to your next set of pictures. All the best and I hope everything fires off without a hitch.


Scott.
.
Reply With Quote
  #237  
Old 04-25-2011, 04:10 PM
Lawrence Ruskin Lawrence Ruskin is offline
Registered User
 
Join Date: Sep 2006
Location: Lions Bay B.C.
Posts: 706
Lawrence Ruskin is on a distinguished road
Where do you get that dip lag stuff?

A search of the archives turns up zilch.
__________________
Do or do not....There is no try.

Yoda
Reply With Quote
  #238  
Old 04-25-2011, 04:53 PM
Pete VanderLaan's Avatar
Pete VanderLaan Pete VanderLaan is offline
The Old Gaffer
 
Join Date: Apr 2002
Location: Chocorua New Hampshire
Posts: 22,033
Pete VanderLaan is on a distinguished road
EG Bartell Seattle.
__________________
Where are we going and why am I in this basket?
Reply With Quote
  #239  
Old 04-25-2011, 07:10 PM
Lawrence Ruskin Lawrence Ruskin is offline
Registered User
 
Join Date: Sep 2006
Location: Lions Bay B.C.
Posts: 706
Lawrence Ruskin is on a distinguished road
Thanks for the help...
__________________
Do or do not....There is no try.

Yoda
Reply With Quote
  #240  
Old 04-25-2011, 07:52 PM
Lawrence Duckworth Lawrence Duckworth is offline
Registered User
 
Join Date: Mar 2010
Location: Gainesville, GA
Posts: 685
Lawrence Duckworth is on a distinguished road
Quote:
Originally Posted by Scott Novota View Post
Lawrence,

All the best and I hope everything fires off without a hitch.
.

thanks Scott,...me too
Reply With Quote
  #241  
Old 04-27-2011, 07:37 PM
Lawrence Duckworth Lawrence Duckworth is offline
Registered User
 
Join Date: Mar 2010
Location: Gainesville, GA
Posts: 685
Lawrence Duckworth is on a distinguished road
Question....

The castings I have, have just one hole for the thermocouple. All the pictures that I have show two, presumably the second is for a temperature limiting device. My question is is there a device that does both and that’s why there is only one opening?
Reply With Quote
  #242  
Old 04-28-2011, 04:27 AM
Rollin Karg Rollin Karg is offline
Registered User
 
Join Date: Apr 2002
Location: Kechi, KS
Posts: 924
Rollin Karg is on a distinguished road
It's possible to have two thermocouples in one tube. Talk to these people and ask for Richard Roberts.http://www.precision-measurements.com/

Last edited by Rollin Karg; 04-28-2011 at 04:30 AM.
Reply With Quote
  #243  
Old 04-28-2011, 07:13 AM
Lawrence Duckworth Lawrence Duckworth is offline
Registered User
 
Join Date: Mar 2010
Location: Gainesville, GA
Posts: 685
Lawrence Duckworth is on a distinguished road
Good idea. Thanks Rollin.
Looks to be about an inch dia. hole.

I'll give him a call
Reply With Quote
  #244  
Old 04-28-2011, 10:05 AM
Pete VanderLaan's Avatar
Pete VanderLaan Pete VanderLaan is offline
The Old Gaffer
 
Join Date: Apr 2002
Location: Chocorua New Hampshire
Posts: 22,033
Pete VanderLaan is on a distinguished road
Be prepared for serious sticker shock. Don't succumb to the temptation of getting a finer than 22 gauge platinum wire. It's just too damn delicate and you'll break it looking at it. . Get a spare thermocouple protection tube while you're at it and inspect once a year. They melt eventually. You can get by with type "s" on the thermocouple type. When you set up your controller make sure it's programmed for type "S". You get lots of choices.
__________________
Where are we going and why am I in this basket?
Reply With Quote
  #245  
Old 04-29-2011, 01:27 PM
Lawrence Duckworth Lawrence Duckworth is offline
Registered User
 
Join Date: Mar 2010
Location: Gainesville, GA
Posts: 685
Lawrence Duckworth is on a distinguished road
$856.00 for type s or $27.50 for a type k.......They don't give those watlows away either.

(And to think I could have had a new set of clubs and a membership at a cheap course.)
Reply With Quote
  #246  
Old 04-29-2011, 04:04 PM
Jordan Kube Jordan Kube is offline
?
 
Join Date: Aug 2003
Location: Seattle, WA
Posts: 1,704
Jordan Kube is on a distinguished road
Wait till you figure out the cost of operation.
__________________
WWUD? Think for yourself.

Last edited by Jordan Kube; 04-29-2011 at 08:46 PM.
Reply With Quote
  #247  
Old 04-29-2011, 05:15 PM
Larry Cazes Larry Cazes is offline
Registered User
 
Join Date: Feb 2006
Location: San Jose, CA
Posts: 1,001
Larry Cazes is on a distinguished road
Quote:
Originally Posted by Lawrence Duckworth View Post
$856.00 for type s or $27.50 for a type k.......They don't give those watlows away either.

(And to think I could have had a new set of clubs and a membership at a cheap course.)
Membership? That is truly a cheap course
Reply With Quote
  #248  
Old 04-30-2011, 05:25 AM
Pete VanderLaan's Avatar
Pete VanderLaan Pete VanderLaan is offline
The Old Gaffer
 
Join Date: Apr 2002
Location: Chocorua New Hampshire
Posts: 22,033
Pete VanderLaan is on a distinguished road
Well, the signature hole is being rebuilt right now so it's discounted. The nose on the clowns face needed some termite damage repair and the mouth needs sanding from all the misplaced putts.
__________________
Where are we going and why am I in this basket?
Reply With Quote
  #249  
Old 05-07-2011, 07:36 AM
Lawrence Duckworth Lawrence Duckworth is offline
Registered User
 
Join Date: Mar 2010
Location: Gainesville, GA
Posts: 685
Lawrence Duckworth is on a distinguished road
Here's the transformer. About $1,800.00 dilivered but that might eventually work out because of the less expensive controls and power savings down the road.

Judd, from watlow will be here tuesday to help work up a control system and pricing....

Last edited by Lawrence Duckworth; 03-03-2014 at 05:41 AM.
Reply With Quote
  #250  
Old 05-09-2011, 12:55 PM
Lawrence Ruskin Lawrence Ruskin is offline
Registered User
 
Join Date: Sep 2006
Location: Lions Bay B.C.
Posts: 706
Lawrence Ruskin is on a distinguished road
So I'm still looking for a small amount of ''dip lag''

At Bartells you have to buy a whole box for $550.

Any more ideas?

Does dip lag have another name? Is it rewettable cloth or something like that
__________________
Do or do not....There is no try.

Yoda
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 02:55 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 - 2020, Jelsoft Enterprises Ltd.
© CraftWEB.com. Opportunity Network. 2008. All Rights Reserved.