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by lucho/lachezar/
Sun Oct 21, 2018 5:26 am
Forum: Kiln Casting
Topic: kilncasting boro glass
Replies: 0
Views: 2586

kilncasting boro glass

Has anyone tried to cast boro glass? Please share your experience: top temperature, mold recipe, annealing cycle, etc... I need to make an outdoor sculpture that will be exposed to direct sunlight in a hot climate where sudden showers and hail are common in the summer. Any advice is welcome! PS - I ...
by lucho/lachezar/
Fri Jul 07, 2017 2:10 am
Forum: Kiln Casting
Topic: Flower pot melting debit at top temperature
Replies: 1
Views: 3673

Flower pot melting debit at top temperature

Hi all! Is there a a prescription of how much glass would flow from an aperture of a certain size for a given time and temperature? I'm about to cast 8 to 10kg (17 to 22 pounds) of S96 glass from a flower pot into a mould with a core. Because of the core, I will close the stock hole in the center an...
by lucho/lachezar/
Tue Jan 06, 2015 8:52 am
Forum: Kiln Casting
Topic: Optical Glass from XYZ
Replies: 1
Views: 3072

Re: Optical Glass from XYZ

I notice several contradictions in the papers that come along with it and as i'm going to fire something very big the length of the whole program may vary more than 2 weeks... 1. Softening Point - according to the "Glass Properties.doc" paper it is 704C, but in the E-book and in the "...
by lucho/lachezar/
Sat Jan 03, 2015 1:26 pm
Forum: Kiln Casting
Topic: Casting and Annealing over 20cm/8in
Replies: 0
Views: 2757

Casting and Annealing over 20cm/8in

Hi all! I'm about to cast a head with part of a chest where my thickest part is 23cm thick ... Should I calculate a ratio based on the BE table (ending at 20cm) or are there any other ways? Thanks! Here are 2 pictures of the plaster model of the sculpture. It is a life size figure of a young boy - 1...
by lucho/lachezar/
Tue Jul 29, 2014 4:47 pm
Forum: Kiln Casting
Topic: Optical Glass from XYZ
Replies: 1
Views: 3072

Optical Glass from XYZ

Hello!

Does anyone have personal experience with the raw blocks of optical glass from http://www.xyzglass.com/rawblocks.html ?

Could you please share impressions, important moments, concerns?

Thanks!

Lucho
by lucho/lachezar/
Tue Feb 18, 2014 4:22 am
Forum: Kiln Casting
Topic: Glass suckers
Replies: 15
Views: 15265

Re: Glass suckers

Morganica wrote: Failing that, I underinsulate in thick areas and overinsulate in thin, to try and equalize heat loss when cooling. [/i]


I always pour my moulds around the model ending with a heavy solid block and never get suckies.
by lucho/lachezar/
Mon Aug 27, 2012 4:42 am
Forum: Techniques and Tools
Topic: strenght of drilled holes for hanging
Replies: 1
Views: 1642

strenght of drilled holes for hanging

Hi!

I may get a commission for which I'm thinking to hang down 3 fused panels 7by2.5 feet each and 110-120pounds each. 12mm thick glass. If I hang them from 3 holes (on each), will the glass survive its own weight?

Thanks!

Lucho
by lucho/lachezar/
Thu Jan 10, 2008 1:07 pm
Forum: Kiln Casting
Topic: Tech needed for casting leaving a sandy skin.
Replies: 0
Views: 3059

Re: Tech needed for casting leaving a sandy skin.

Hi Paul, Some of this was discussed just before new year here: http://www.warmglass.com/phpBB/viewtopic.php?f=7&t=27066 I think on page 2 there is my recipe for kiln sand casting... If you want the sand to stick to the glass, just do not add anything for separation. As for sea/river sand; yes - ...
by lucho/lachezar/
Sat Dec 29, 2007 8:21 pm
Forum: Techniques and Tools
Topic: Cold Polishing
Replies: 1
Views: 3081

Re: Cold Polishing

Good advice by Lucho...I find cold-working with a hand held machine is very challenging, precisely because of the variations in pressure and angle, dwell time, etc. The first challenge is to get the surface totally flat. Ronny, I disagree here - the only surface that must be flat is the bottom of t...
by lucho/lachezar/
Sat Dec 22, 2007 3:36 pm
Forum: Kiln Casting
Topic: annealing schedules for large kiln cast sculptures
Replies: 0
Views: 10031

Re: annealing schedules for large kiln cast sculptures

Lucho, I went to your website and looked around. This method of kiln sand casting you use, did you use it to cast "17 Houses of the Holy 5" for instance? Hugh No, this one is hot cast; if you see clear glass of good transparency in my work then it is hot cast. Kiln sand cast are "Cas...
by lucho/lachezar/
Sun Dec 16, 2007 10:27 am
Forum: Newcomer Forum
Topic: You might be a newbie if.....
Replies: 2
Views: 5065

Re: You might be a newbie if.....

After grinding your nails you need to polish them as well... I'm doing it for over 15 years!

And please, I need the copy right permit for printing this one out here in Bulgaria.

Lucho
by lucho/lachezar/
Sun Dec 16, 2007 10:16 am
Forum: Newcomer Forum
Topic: Large Bubbles
Replies: 4
Views: 4456

Re: Large Bubbles

Your firing program, please. And what type of enamels? Glass, too...
by lucho/lachezar/
Sun Dec 16, 2007 10:13 am
Forum: Techniques and Tools
Topic: I can't find the reason for my devit problem
Replies: 0
Views: 2673

Re: I can't find the reason for my devit problem

Can you say if your kiln is responding accordingly to the program? If only one element is gone or one phase (in 3 phase circuits) is low (voltage) or bad contact it may cause temperature differences in the kiln beyond the thermo-couple ability to read... Then following Cynthia's, post I used to have...
by lucho/lachezar/
Sun Dec 16, 2007 9:44 am
Forum: Techniques and Tools
Topic: Q: Annealing around trapped air
Replies: 5
Views: 4508

Re: Q: Annealing around trapped air

I'm behind Dave... I had a piece with trapped air around an inclusion which I gave to cover its back with mirror amalgam, and as they use vacuum in these chambers, it broke from the bubble. However, if you are not going to force your pieces to an opposite vacuum extrema, an adequate annealing should...
by lucho/lachezar/
Sun Dec 16, 2007 9:17 am
Forum: Kiln Casting
Topic: Surface Issues
Replies: 1
Views: 5268

Re: Surface Issues

Not so long ago, I used to ask my granny to sit in front of my old Soviet kiln, read a book she likes and check the temperature every now and then: " if it drops 5dgrC below 'X' turn it on, if it gets 5dgrC above 'X' turn it off " - and so on for 2-3 hours and then off, relying on insulati...

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