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Old 11-26-2019, 09:07 AM
neil duman neil duman is offline
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now that there is a choice

Not looking for any comments on batch v cullet.
I would like to hear from folk who have been using the Bomma or Kugler cullet.
I rather not have to ramp up to 2150 to charge cullet.
I batched at 2250 when I did batch.
Any info is appreciated.
Thanks
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Old 11-27-2019, 10:07 PM
Jordan Kube Jordan Kube is offline
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A lot of people work their glass close to or at 2150. I wouldn't try to melt cullet much colder than that and expect good results.

I can't give you the comparison on bomma vs kugler but I have worked with the bomma. It struck me as a very long working glass. Probably close to spruce. I've been using mostly spectrum products and cristallica over the last few years.
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Old 11-28-2019, 10:42 AM
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David Patchen David Patchen is offline
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Bomma is probably the nicest glass I've worked with and I've worked with a few. I think 2150 is a good starting point to work at (every furnace varies). It's an easy glass to blow and has been compatible with all the gaffer, reichenbach and sys 96 rods I use. It's always hard to explain working properties, but I'll try: Bomma is very linear in it's behavior, fairly long-working, 'creamy' and viscus and soft when hot rather than wet/sloppy. It reheats easily and stays a bit thicker even when really hot, so cane pulling feels easier vs. other glasses. It's really clean, bubble-free when properly melted and I'm really glad we switched. I don't miss the Spectrum 2.0.

Last edited by David Patchen; 11-29-2019 at 05:23 PM.
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Old 11-28-2019, 06:37 PM
Michael Ahlefeldt-Laurvig Michael Ahlefeldt-Laurvig is offline
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2150 is a good blowing temperature, you dont have to ramp anywhere, the cullet will melt nicely, although Ive never tried just those
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Old 11-29-2019, 07:35 PM
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Pringle Teetor Pringle Teetor is offline
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Ive been hearing stories of chords in the Bomma. Have you seen any?
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Old 11-30-2019, 05:49 AM
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Pete VanderLaan Pete VanderLaan is offline
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Chords come using musical instruments. Cords are inhomogeneities in glass.

It would not surprise me to see cording when you are switching from one glass to another. Cleaning your pot well, then running one wash load, throwing that away and then just melting should yield a reasonable glass. People don't like throwing away glass at $1.50 lb.

It's a cost of doing business.
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Old 12-01-2019, 01:35 PM
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David Patchen David Patchen is offline
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Quote:
Originally Posted by Pringle Teetor View Post
Ive been hearing stories of chords in the Bomma. Have you seen any?
I haven't seen many, but we washed the pot well before switching and our pot was in good shape. Pots that are pitted don't wash so well and continue to hold the old glass (and dissolve more pot) in the nooks and crannies, so more cords.

I think if melted well in a newer, well-washed pot, the Bomma should be cord-free and really nice.
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Old 11-30-2019, 12:59 PM
Josh Bernbaum Josh Bernbaum is offline
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Quote:
Originally Posted by Michael Ahlefeldt-Laurvig View Post
2150 is a good blowing temperature,
Maybe it is, maybe it isn't. I felt compelled to chime in to say it depends on what one is making and one's unique furnace/unique thermocouple.
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Old 11-30-2019, 07:17 PM
Michael Ahlefeldt-Laurvig Michael Ahlefeldt-Laurvig is offline
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I have an optical thermometer, it matches a glowing wire to whatever you aim it at, so I dont have to be questioning the temperature. But ok Ill agree to a small extent that what youre making could demand a small change. The main point I was making was that 2150 works fine to melt cullet overnight, at least my own Glasma. It seems odd that you would have to ramp up to a normal working temperature to melt cullet
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