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| Boro Room -- For Boro-related tips, techniques, and questions. |
2012-10-12, 9:10am
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Junior Member
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Join Date: Jan 20, 2007
Posts: 11
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Flame cut pyrex beaker ?
Anyone ever attempt to cut the base of a pyrex beaker?
I need a short large cross section tube and it seems like
cutting the base of a pyrex beaker would be just nice.
Any tips on doing this would be greatly appreciated.
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2012-10-12, 11:26am
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Save the Numbats
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Join Date: Jul 23, 2005
Location: The Arctic
Posts: 577
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What is it you want to do, exactly? Remove the bottom of an erlenmeyer flask?
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2012-10-12, 11:34am
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Junior Member
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Join Date: Sep 07, 2006
Posts: 25
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Why not just flair out some tubing instead?
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2012-10-12, 11:40am
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Junior Member
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Join Date: Jan 20, 2007
Posts: 11
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I plan to make this and I need the oversize glass tube
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2012-10-12, 1:08pm
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honorary bead lady
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Join Date: Jan 14, 2008
Location: Mostly the doghouse
Posts: 5,180
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David
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2012-10-12, 1:12pm
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Borovangelist
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Join Date: Jan 26, 2007
Location: Auburn, MA
Posts: 3,002
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It might work. I'd say anneal the beaker first just to be on the safe side, let it cool, do your cut, carefully polish it and hope for the best.
The only warning is that beakers tend to have a rolled edge with a pour spout, right? You might have to figure out how to contend with that.
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-Tom
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2012-10-12, 2:41pm
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No Longer an LE Member
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Join Date: Sep 12, 2012
Posts: 20
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Cut it on a saw......
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2012-10-13, 1:15pm
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Junior Member
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Join Date: Sep 07, 2006
Posts: 25
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NO idea what size that is but I'm sure if yeh call around some of the glass places they would probably cut you a piece what ever size yeh want?
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2012-10-13, 8:45pm
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Member
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Join Date: Jan 12, 2012
Posts: 79
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If you really want a clean flame cut you will need to chuck the beaker in a lathe so it is turning. You could otherwise use some rollers to keep it steady in the flame. A thin hot flame is what your gonna need to cut it and have a punty attached to the bottom middle so you have a handle to pull the bottom away with when it gets hot enough all the way around. The punty will also allow you to spin it without having to hold that big beaker top in your fingers and try to spin that. And for sure anneal it first.
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2012-10-14, 2:09am
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Boro Bum
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Join Date: Sep 19, 2009
Location: Western NY
Posts: 317
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Wet saw FTW
AcidFly
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2012-10-14, 3:07am
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the german guy
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Join Date: Feb 11, 2010
Location: ..close to the edge
Posts: 59
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why not just take a tube in the diameter?
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2012-11-04, 6:47pm
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New-old member
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Join Date: Nov 02, 2012
Location: Rochester, NY.
Posts: 42
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Quote:
Originally Posted by khan
If you really want a clean flame cut you will need to chuck the beaker in a lathe so it is turning. You could otherwise use some rollers to keep it steady in the flame. A thin hot flame is what your gonna need to cut it and have a punty attached to the bottom middle so you have a handle to pull the bottom away with when it gets hot enough all the way around. The punty will also allow you to spin it without having to hold that big beaker top in your fingers and try to spin that. And for sure anneal it first.
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Hot-popping is fun!
Instead of a lathe you could use a lazy Susan or old turntable and a hand torch. Just mark and score where you want to pop it (just a little nick with a file or tungsten cutter), stick it on the turntable upside down and use a hand torch on a map gas canister to slowly heat it up while turning it with your other hand. It will pop, then you can carefully take the bottom off and fire polish.
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2012-11-04, 10:23pm
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Bernhard Riegler
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Join Date: Jun 03, 2010
Location: Northland - New Zealand
Posts: 452
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I don't know if this would work for boro, but have a look and try: http://www.youtube.com/watch?v=sFXngPx3w3M
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Bernhard Riegler - Bay of Islands - New Zealand
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2012-11-05, 6:03am
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newbie
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Join Date: Feb 18, 2007
Location: The land of Oz!
Posts: 465
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this is how you do it
get the right size tubing, like steak said,
set up a hotwire, which is a length of tungsten wire connected to a transformer (length varies with power of transformer) and suspended on either end to form a cradle.
Score your tubing, turn it evenly and on line on the hotwire until the glass gets "grippy" and dab a little bit of water on the score mark and the glass will shock in an even line all around. Then flame polish bothe sides and kiln it up.
Don't bother with beakers, most of them are light wall and it'll be more of a pain than it's worth.
here's a vid I made last week, for no reason, when I was cutting down lengths of 70mm diameter glass ... I had to cut 200 of these for a job. No idea why I took the vid at the time, but it comes in handy now 
http://youtu.be/L0NpY8hKcyw
.
.
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Running a
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by Miema on LPG and oxy bottles and a GTT Mirage.
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2012-11-05, 9:22am
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Borovangelist
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Join Date: Jan 26, 2007
Location: Auburn, MA
Posts: 3,002
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Nice!!
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-Tom
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2012-11-14, 7:29am
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Run Free Sweet Boy
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Join Date: Jan 29, 2008
Location: Orlando, Fl.
Posts: 2,194
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best to buy the tube and cut it with a glass saw
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2012-11-14, 11:01am
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Junior Member
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Join Date: Jan 20, 2007
Posts: 11
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Wow.
Super educational video...... thanks
I was asking about beakers because glass tubes are hard to come by here
I found a scientific glass Co here but they want approx 200 bucks for a
10cm x 10cm section!!!
Think its prob easier for me to fabricate the roaster out of stainless steel mesh.
Thanks for that great video
At least now I know how to do it properly
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2012-11-14, 12:09pm
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Junior Member
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Join Date: Feb 27, 2012
Location: Cadillac, Michingan Area
Posts: 18
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Glass cutter once around and then fill with very hot water from a tea kettle, let st a few minuter, next, dump the water and add ice and let sit a few minutes. Now tap from the inside and it should break at the score. I cut wine bottles all the time and have very good luck with the method. All my drinking glasses are recycled wine bottles I get at the recycle center. The above method is what I used in my science classes.
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