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Old 11-13-2018, 08:05 AM
bob gent bob gent is offline
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shutting off the glory hole

I noticed on a recent thread that Pete was not in favor of shutting off an unused glory hole, and I'm interested to know the reasoning behind that.
In my shop, I put switches on both my glory holes that I can operate with my foot.
I'll light them both, a large one and a small one, and let them come to temperature. Then as I'm working, I'll start out in the small one till my piece outgrows it and I switch to the large one. At that point I'll shut off the small one, as I won't be needing it for twenty minutes or so. The door is shut, so it doesn't lose enough heat to take long in warming back up. Once the piece is finished and in the oven, I'll shut the door on the large hole and turn that off, having turned on the small one in preparation for starting the next piece. I'll turn on the large one long enough before needing it that it has ample time to get back to full temperature. it takes maybe a couple of minutes.
In my thinking, I'm not only saving fuel, but also keeping the shop cooler and quieter in the process. At the same time, I've learned not to trust my conjecture in the face of someone more knowledgeable.
Am I missing something here? I don't have to waste fuel waiting for the furnaces to come back to heat, and it doesn't seem like the refractory is suffering much from cycling, but again, I could be missing something important
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Old 11-13-2018, 08:28 AM
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Pete VanderLaan Pete VanderLaan is offline
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To each their own. It sounds like you have a fiber gloryhole but it may be cast or brick.

When I was working in Shanghai, Wang Kai kept shutting off the glory hole if we had the work out on the bench. It drove me crazy. I never had the radiant heat I wanted from the front of the gloryhole. Eveline told him he had to stop.

I use a larger gloryhole than necessary so I don't have to consider stuff like that. There's a limit. We have two here, one about 12 inch and the other sixteen. These days the only one we use is the 16. I don't think there's any right or wrong way to do this stuff.
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Old 11-13-2018, 11:55 AM
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Scott Novota Scott Novota is offline
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Time vs. hassle is why I would not do this. If your time and hassle ratio is worth the cost savings who am I to tell you it is wrong?

I would look into exactly what you think your saving vs what you are actually saving. Start your day and mark your gas meter numbers down. Work as you normally would switching, waiting, and working our system.

Do it the next day but just use the larger of the two gloryholes.

Now take your bill and figure out what your cost is per unit and compare. See if your day to day change is worth the effort? Did you get and extra piece out by not switching around? Did you make better work by not having a distraction?

Eh, might be worth it but you will never know until you figure out what you may or may not be saving.

Me I just fire up one glory if I might be making larger work and the small one if I know I will be under 10 inches. Keeps things simple.
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Old 11-13-2018, 05:04 PM
Eben Horton Eben Horton is online now
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the best way to save costs in the hot shop is to blow as much glass as possible until you just can't deal anymore, say 3 months straight and then shut the furnace off for a a few months.

I turn my hole off when I take a lunch break.

Something to consider is that a HOT hole can make things a lot faster to make as opposed to a colder hole. don't be a penny wise and a pound foolish.
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Old 11-13-2018, 08:29 PM
Philip Yamron Philip Yamron is offline
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Why not just put a 2nd set of doors on the larger GH. Second set having a smaller opening. Then 1 hole used and you just leave the smaller doors open as your work increases in size.
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Old 11-13-2018, 09:16 PM
Josh Bernbaum Josh Bernbaum is offline
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I'd agree with Scott. You really should meter your usage and the numbers
won't lie about whether this method of the on/off with the two holes is more efficient or not. Maybe it's similar fuel use either way and then you choose what's more convenient or easier. Won't know till you know.
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Old 11-14-2018, 07:43 AM
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Pete VanderLaan Pete VanderLaan is offline
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mine keeps the studio warm. A biggie.
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Old 11-24-2018, 08:08 AM
bob gent bob gent is offline
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thanks for the feedback. I've just moved to the country and need to put up a building to house the shop, so there's a lot of chances to rebuild stuff differently. Maybe I ought to think about putting new doors on the big glory hole. I haven't ever made a hole with multiple sized doors. maybe now's the time
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