Tips for Tack Fusing
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- Опубліковано 10 лип 2024
- Tack fusing is an effective method for creating textured works in kilnformed glass.
In tack fusing, glass is fired within a range that creates enough heatwork for the material to fuse while maintaining the desired amount of form and texture.
Tack fusing often results in pieces with varying thicknesses. This raises technical issues. In this lesson, you’ll learn the effects of firing to different tack fuse temperatures. We’ll also cover firing schedule considerations to avoid thermal shock and promote effective annealing.
Finally, we’ll follow a project through tack fuse and slump firings.
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This is an excellent introduction to tack fusing - thank you. The explanations are clear with good visual images to accompany them. Firing schedules are explained.
You're quite welcome!
This is precisely the information that I was looking for in order to decide on what glass grain to buy for a project. I'm new to glass and have been researching for weeks, but there's nothing like this video anywhere else; not even visual comparatives. THANK YOU!!!
You're welcome! Plenty more here, on Vimeo, and at videos.bullseyeglass.com
Thank You!!!! Extremely helpful
You're welcome!
Thank You
You're welcome!
Thank you
You're welcome!
Excellent video. Thank you. Please include the final slump schedule so we can see how slow the ramp up needs to be. Also - would there be a situation where a longer anneal should be programmed for pieces that are fused multiple times (as in this tack project)?
Cindy,
Yes, I see we didn't include the slump schedule by itself but we can reverse engineer it using the guidance provided at 6:00 in the video.
We use the Anneal Chart for Thick Slabs and find the entry for twice the thickness of the thickest part of the piece. We're using 2x the thickness since this is a slab of variable thickness and therefore at greater risk for design-induced stress.
Once we have that thickness line we go out to the 'Final Cooling Rate' column and use that rate as our initial ramp to 1000˚ F. From there we can use 600˚ F per hour rate to the process temperature and process hold for the slump as described.
After that we can follow the same 2x thickness line on the chart back down. In this case that will be same as what was on both the first and second firing schedules.
As to your question if multiple firings affect the annealing cycle, that would be practically 'no'. It's really about the thickness and build complexity that affects the annealing process. As always, if building up a large or complex piece, testing at small scale is always advised.
Thanks and good luck!
Do you know the name of a soil other than a ceramic sheet used to place the glass in the oven? Where do you get it?
Using a ceramic composite kiln shelf such as cordierite/mullite with a separator such as Fiber Paper, ThinFire, or Shelf Primer, is economical and easy to employ.
There are other options such as rigidized fiberboard or SilkeMat. These are for specialized applications such as large scale shelves or for achieving custom contours. They are more technically complex to set-up.
A number of these materials can be found at:
shop.bullseyeglass.com/tools-supplies/kilnwork
A library of techniques can be found at:
videos.bullseyeglass.com/