How to CUT GLASS.

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About: I love making things. I have for as long as I can remember liked to make stuff. Now days I have two kids (Thomas and Emma) and most of the things I do are safe for them! I love electronics and Microchips, I ...

Intro: How to CUT GLASS.

Loads of useful TIPS on how to cut glass. Mainly aimed at the tiffany world but also useful for general glass cutting.

Including the following:-

  1. Designing and trial with card.
  2. Maximising glass by careful layout.
  3. Bulk cutting to average out errors. Measuring technique, and cutting multiples.
  4. Technique of cutting glass.
  5. Alternative methods of breaking glass.
  6. Different types of glass, and the best side to cut.
  7. Different types of glass cutter.

Step 1: Designing and Trial With Card.​

This is the first and most creative step. Designing the lamp and then trialing the shape using cardboard.

This is how i start all my lamp projects.

  1. Take a piece of paper and draw the side profile. if larger than one sheet of paper join two sheets and trace the half.
  2. If you are happy with the shape and general proportions test to see how the chosen light bulb will fit.
  3. Next you have to choose how many layers (rows) you will divide the shape into. consider the amount of work lots of rows will take compared with the shape compromise with less.
  4. Now you need to decide how many sides you want. again the more you have the more flowing and smooth the lamp will look, but the more time and fiddly the bits will be. ALSO i believe you are better off having and even number of sides, that way you can alternate the colours.
  5. Now you need to work out the size of all the bits and if you wish make up the lamp with cardboard.
  6. Finally if you are happy with your shape then spend some time working out the amount of glass you will need and whether you will have to use different colours?

Step 2: Maximising Glass by Careful Layout.

I cover this part a lot in the video.

Basically you need to maximise the amount of glass whilst working within the limit of the glass! AND consider/realise that you don't need to allow for a cutting (blade) thickness.

In the picture above you can see how i have cut the 12 sections of glass needed and made the most of the glass width. If you watch the video you will see i failed on one of the white pieces, thankfully i didn't fail on the purple as the picture shows.

Step 3: Bulk Cutting to Average Out Errors. Measuring Technique, and Cutting Multiples.

This is obvious to me but maybe that's because i have an engineering background? So sorry if i am telling you how to suck eggs but i need to explain this bit.

Firstly work out the sizes of the bits you need and then work out the values you will need to mark out along a rule. Don't mark the first dimension then reposition the rule to mark out the second. WORK FROM A DATUM which is normally the edge of the glass. Then work out all the cumulative dimensions along the ruler and mark out all at once. (even include the distance in from the edge if required) I work out the measurements on a spreadsheet for all the layers.

If you can't fit enough on one row then you may as well cut the bits you can fit so there is room left at each end.

  1. Mark out the number of rows you will need, using the top edge as a datum and adding the distances as you go. I.E height needed to be is 63mm so mark out 63mm then 126mm then 189mm and lastly 252mm.
  2. Cut the rows out first.
  3. Mark out the top and bottom of each row using the technique explained above.
  4. Line up the number of rows so all can be cut at once.
  5. Once cut line up again cutting as many as you can.
  6. Repeat the multiple cutting until all are done.

Basically the above method averages out errors. if you cut one bit to big then you will have a corresponding small bit.

If you attempt to cut just one bit, then cut another bit and so on then you may find you end up with all the bits too big, and you really want to avoid that!

Step 4: Technique of Cutting Glass.

The video shows this step very well. (and much better than i can explain)

  1. Working on a stable workbench and with a suitable guide make sure the glass and guide cant slide around.
  2. Make sure the guide is positioned correctly so the cutter wheel is on the marks.
  3. Hold the cutter firmly and starting from the furthest edge make ONE FIRM PASS towards you.
  4. Carefully lift up the glass (it may have already broken) and position a match (or needle) under the score line.
  5. Apply firm pressure to either side of the score line and the glass should break.

AND that should be it. However it should be noted that different types of glass and even different colours of glass can cut differently. I tend to find that Red is the hardest to cut. If you are new to tiffany work and cutting glass then try to stick to hand blended/machine rolled. If you try the hand blended and hand rolled then it can be very uneven and a nightmare to cut.

Step 5: Alternative Methods of Braking Glass.

There may be occasions where using a match or needle under the score line to break the glass isn't suitable. Maybe (as shown in the video) you have cut very close to the edge. so you have a few other choices.

  1. Find a glass cutter which has slots in the side (the one pictures on the left) then position the glass into the best fitting slot and apply pressure.
  2. You can get a special tool for breaking glass. (see picture)
  3. Or as shown in the video you can turn the glass over and tap along the score line from the other side and you should find the glass will break along the line. The disadvantage with this is that if you tap just a little bit off the score line then you can get a "messy break"

It should be noted that the blue tool is for straight lines only. If you are cutting curved shapes then the tapping on the reverse of the score is best.

The metal tool shown in the pictures is a special set of pliers which have a curved jaw on one side this allows you to grip the glass at the score line. However this only works if your score line is within the reach of the jaws.

Step 6: Different Types of Glass, and the Best Side to Cut.

Over the years i have been making tiffany items i have discovered that not all glass in the same. Different colours different textures, hand rolled/machine rolled. What i would suggest is start simple and use plain clear glass the type you would use in a greenhouse. Then once you have mastered the easy stuff then move onto harder types like hand blended/machine rolled and then harder still hand blended/hand rolled.

On every type of glass you will find there is a better side to cut. you should look for the more "glass" side which may sound daft but if you look closely you should see a slight pattern where the glass has been rolled, and generally cut on the other side.

Step 7: Different Types of Glass Cutter.

You can see in the picture that you can buy several types of glass cutter.

It really depends on how much glass cutting you are going to do? Whilst doing this instructable i tried the middle glass cutter and it was so blunt it really didn't make a scratch! However the cutter on the right is by far the best cutter, it has a receiver full of oil and everytime you push it down a little bit off oil is used to lubricate the wheel. However it is also the most money, so it really does make a difference for the extra money you pay.

I hope this instructable has been of some use to you and thanks for reading/watching.

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    26 Discussions

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    Zaacharia

    4 weeks ago

    I first started cutting glass in 1971 when I was building insulated (double-pained) glass windows. I think the first rule I learned (they asked that I repeat it 7 times):

    DO NOT CATCH FALLING GLASS

    Then it was do not be dainty and do it in one stroke - start at the far edge and pull the cutter towards you.

    We worked on a carpeted surface; we made the stroke, pulled the sheet to edge of the table so that the score was right on the edge, lift the sheet and drop it applying extra pressure. When the piece was too large, we would place a yard stick at the score, lift the sheet and drop it. Our wastage was minimal but since I was the most junior, my job at the end of the day was to take a 5 foot 40 pound rod and smash the glass in the dumpster (What a feeling of release).

    Sorry for the nostalgia but I had not thought about that for 30 years.

    2 replies
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    mr_fidZaacharia

    Reply 27 days ago

    Thanks for the story! i have thought about doing lessons, but the safety aspects in the modern world make it too complicated! i am not sure about you, but i find that wearing gloves makes it much more dangerous and you are more liable to drop bits.

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    Zaachariamr_fid

    Reply 25 days ago

    The only time we used gloves was we were cleaning the inside surfaces of double pane glass. If there was a fingerprint in there, you could guarantee it would be spotted and sent back.

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    Violet-Person

    6 months ago

    I have just started getting into glasswork. have any tips for cutting curves? I haven't got the knack for that.

    5 replies
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    mr_fidViolet-Person

    Reply 6 months ago

    I have just finished playing for the day! Your question has resulted in another instructable! I will hopefully edit the video and upload over the weekend. The whole camper was done freehand.

    IMG_1480.JPG
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    Violet-Personmr_fid

    Reply 6 months ago

    Hurray! Looking forward to it. And I like the hippie van too.

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    mr_fidViolet-Person

    Reply 6 months ago

    I will do another video at the weekend on how to cut curves. However i tend to mark out the glass with a permanent pen then starting nearest to you, push the cutter away from you following the line in front. Then using the tapping method to break the glass.

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    itsmescottymr_fid

    Reply 6 months ago

    in my glass days, when doing tight curves and circles I scored a tangent line to give relief for the break.

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    Studio Rat

    Question 6 months ago

    I’ve been using glass from old bottles and jars to make tumbled glass jewelry. I started out just using a hammer. Now I use tile nippers which gives me more control. Do you have any tips for using a glass cutting tool on pieces of this kind of glass?

    E3B10A58-97D1-470E-8CA2-71596CB23033.jpeg
    2 more answers
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    icengStudio Rat

    Answer 6 months ago

    A simple rock / tile cutter with thin circular saw blade does that easy.

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    mr_fidStudio Rat

    Answer 6 months ago

    I tried cutting jam jars a while ago and found it very hard. cutting the top and bottom of is possible and loads of people have done instructables for that, but looking at your picture cutting the bottom sections and interesting patterened areas is very hard.

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    MicheleM150

    Question 6 months ago on Introduction

    Hi there, off the art subject but can tempered glass be cut to make seed starting frames? We have a bunch of cast out shower panels we want to make seed starting cold frames with . But i am told we cant scratch tempered glass well enough to cut size needed to fit in huts?

    Your option would be most appreciated thank ewe:)
    michele

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    Taz-HoodMicheleM150

    Answer 6 months ago

    Hi Michelle, I would check with your local professional glass company to see if they can cut your recycled shower panels to the sizes you need for starting frames for a reasonable price. The process may be prohibitively expensive or they may give you the same answer as Mike, but it doesn't cost anything to ask. While you're there, ask them what they would recommend and why. New glass might be cheaper than the cost of cutting tempered glass (if it's even possible). Good for you for attempting to re-use. Could you size up your frames to use complete panels? Best of luck!

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    MikePMicheleM150

    Answer 6 months ago

    Sorry, but it is impossible to cut tempered glass-- you will be able to score the surface like you would non-tempered glass, but instead of breaking along the score the glass will dice into many small pieces (like when you see a broken side or rear window in a car). Not only do you end up without the glass you need, you will have a large mess and it is unsafe (the glass will dice almost explosively).

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    Taz-Hood

    Question 6 months ago

    Thank you for this lovely and useful Instructable. I signed up for a short community-based stained glass class when I quit smoking on June 23, 1971, to take my mind off of wanting cigarettes and to keep my hands busy, so I haven't "broken glass" in almost 47 years. The piece I created (a goose with the sun's rays rising behind it) was so awful that I put it out with the trash. Almost ten years later I was driving around (15 miles from where I lived when I discarded it and in a completely different town) and saw it in someone's front window! I was equally flattered and horrified. The moral to this story is that even one's first attempt at making a stained glass piece may be appreciated by someone, so now that we have the internet and sites like Craigslist and Etsy, give someone a chance to own your early efforts, even if you wouldn't display them in your own home. :-)

    I am struck by the fact that all of your pieces are perfectly sized in copper. Wow! Is lead sizing no longer used? If not, how do you combine your pieces into a lamp? Your Instructable has inspired me to check with local art groups to see if there is a class being offered where I could try again. I promise, no more geese. Again, thank you so much!

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    anjoze

    6 months ago

    Thanks for sharing

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    pgs070947

    6 months ago

    The key ingredients in cutting glass are confidence, a high quality TC wheel cutter, a dish of white spirit and speed. I have never had any luck with a diamond tipped cutter and these are only good for writing your name. Thoroughly clean the glass along the cut line. Dip the glass cutter into the white spirit. Start away from you, a short scribe to the furthest edge, then all the way back in one scribe. Speed is the essence. If it's a long cut on a work surface, pull the glass towards you so it overlaps the edge, hold either side of the scribe, lift and peel apart like opening a book. If that doesn't work, first blame the scribing, then put a nail or a barbeque skewer exactly under the scribe and push down either side. If that doesn't work, use a "V" notch tile plier/cutter at the edge. For thick plate glass, a Rubi type tile cutter works well

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    PaulD279

    6 months ago

    Never had success cutting glass, thank you for your advice. I think the problem was always the cutter.

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    itsmescotty

    6 months ago

    As a younger lad in my early 20s I was into crafts like ceramics and glass. I used actual single and double channel lead came, never used the copper foil. Life, likes and circumstance changed and I never got back to it but have always had the need to cut glass for projects. Single strength window glass, always available, just never likes to play nice tho, sigh!