I've heard about scoring the glass on only one side and scoring it on
both sides as the preferred way to cut/break glass. I've done it both
ways. Anyone got any real insight into this matter????
H. R.(Bob) Hofmann
score it on one side. break apart by pulling down on each side of the cut
with the cut on the top surface, or break on a sharp edged tabletop if the
piece of glass is large and the part you're cutting off is not small.
I know because the other door of the pair of sliding glass doors had a
nice neat crack running through it. Also, the doors were from about
40 years ago before the building codes were very strict. Thanks for
If it's not tempered (can't be cut), and it's not laminated (more
complicated to cut), then cutting on both sides is entirely a waste of
BTW, you've set a record. I've never responded to a post that had
four prior posts quoted with three of them by the OP.
On Fri, 11 Apr 2008 14:27:47 -0700 (PDT), "hr(bob) email@example.com"
Old glass can be a lot harder to cut.
BTW, that building I talked about a few months ago that was being torn
down had 4 mirrors 6 or 8 foot wide by 10 foot high each. To buy new
would be 500 dollars a piece, 2000 total, I was told. Despite that,
we offerred them free to a glass guy and he didn't want them. Too
hard to use them without breaking them, or too hard to cut them for
the next location without breaking them. They are 40 years old.
So we left them, and I suppose the new owner who is tearing the
building down will too.
For almost all glass, you score one side only and quickly snap it. I
suggest a wood dowel rod under the score line. Don't take you time after
you score it as the glass "heals" and becomes harder to break. Don't double
score, that will make for an uneven break. Don't use old glass. Yea, the
stuff does get old and it will be harder to get good breaks.
Special cases apply to plate and tempered glass. Do some practice and
learn to do it fast, it is much easier that way.
Just scored one side along the equator of the 3 foot by 6 foot piece
of glass, laid it on the ground over a 4 x 4 , with the score along
one edge of the 4 x 4, turned around to do something else and crack -
it broke perfectly along the score mark without me even touching it.
Wish all my glass-breaking events went this well.
On Fri, 11 Apr 2008 14:08:48 -0700 (PDT), "hr(bob) firstname.lastname@example.org"
Clean the glass. Clean it a second time. Drizzle a line of kerosene
on the line. Score. The scoring should sound like a continuous
ripping. Put the score on the edge of a table and give it a quick
snap. You could tap the glass along the score line if the glass is
thick. I have not ever tried scoring both sides--don't need to.
Always, protect your eyes.
Wondered if someone would mention liquid. We always wet the score
afterward with water, spit will do. Never heard of using kerosene. Most
what I did was with glass tubing in the lab and it was unnecessary to
score all around the tubing as water helped propagate the crack. With
glass sheet you probably should score all the way - only one side. You
break by pushing away from the crack. The crack will propagate to the
other side. To avoid a sharp surface on cut glass in the lab, we would
sand down with metal screen. A couple of quick passes would dull the cut
I have read instructions to dip cutter in kerosene .. have tried it, but
noticed no difference. I have never seen instructions that advise
cutting both sides, but it certainly makes sense for laminated glass.
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