Glass grinding with silicon carbide by hand

Now we’re going for the simple
non-tool necessary grinding. There are number people who will lap their glass on another piece a flat
glass. When you do that, we’re using silicon
carbide, regular 1/4″ float glass from
a glass store. As you use it your glass and this glass will both grind at about the
same rate. This will grind slower if you’re using a
lead glass which is softer but basically we’re going to grind two different surfaces. Some people are
using wine bottles to make drinking glasses or candle covers, whatever they can imagine. Obviously we have a video of grinding and
polishing on a lapping wheel but if you just have
a few that do or you have more time than sense, or dollars, you can lap grind on this. If you’re in any kind of
production mode obviously machines will be to your
advantage. Now I’ve got my piece of glass I’m going to
put a couple pieces of from rubber down just to keep it from sliding while you’re doing your grinding and also to
protect the other side because you may want to use one side for a
coarse grit and be other side for fine grit, flat
glass has two sides you might as well take advantage of both sides. I’m going to start with a 120 grit that we sell.
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We double bag it. And for ease and convenience of dispersing it, we use one of our disposable plastic cups that way if I drop it I’m not
losing everything. I will need a little bit of water. This is water, not wine. As I said this is the 120 grit. This is part of a wine bottle that was
cut on a diamond saw, it’s all very coarse and rough Every once a while, I’m stopping grab a little bit
more grit to go inside the bottle. And have a towel that you’re going to commit
just to this grit or have another pan for dipping and rinsing. Now that surface is more flat but there are still chips so I would have to keep going quite a
while if I needed to get all these chips out This is a puck of glass slightly
concave on the surface. You can see it begins to work. On a diamond
wheel this would be far faster but it can be
done this way. Two options if I’m going to be
griding on the other side of the glass with the finer grit this needs to be cleaned up. Ideally if you have more than one piece of glass,
which I do, I could dedicate this to this one grit and just leave it let it dry. Tomorrow
when I come back to grind the next piece add a little more water, a little more grit
if I need it because there is still grit there and you don’t want to waste it. I’m going to
demonstrate a finer grit so you can see the difference in the
finish. Again on these little foam pads and a fresh piece of glass. I’m going to use a little less water and
a finer grit, and I will grind the same pieces and I
will show you the surfaces before and after so you can see the difference in
the finish. Because I’m using a much finer grit there
is a greater possibility of the dust to be airborne so again I’m going to do my best to protect my lungs and my
eyes. 400 grit. Fresh cup. Kind of a thick paste. Now that I have my dusty material in the
water it’s not getting airborne I don’t need a respirator and the eye
glasses. This is the finish from the previous 120 grit. and the finish from the 400 grit. Some studios that are blowing glass making vases or drinking glasses or
whatever and you’re torching your punty mark, you don’t have a reason
to grind the bottom of every piece. If you have a few that rock this may be a quick and easy way to smooth out the bottom so it’s more stable, presuming you don’t need
to go to a fine polish. Different studios have different
requirements for their glass this is just one other option. The final object is to grind your glass. Over time the glass… this glass will be ground away also and slowly will become un-flat and dished, so if a flat surface is critical to you this on a new piece a glass is good after you’ve done this for a long time
it will no longer be perfectly level.

21 thoughts on “Glass grinding with silicon carbide by hand

  • Sorry. We try to reduce the volume of the music during the vocals, but we've found it tends to make listening and watching easier with some background music.

  • Is it possible to get a precision polished surface this way? I'm interested in making a optical flat for toolmaking and other machinist uses.

  • Does this work with pumice and cerium oxide? I do cast glass pyramids, and can't afford the cost of a lapidary wheel system, though I would love one, so much. my goal is basically to get a smooth flatter side to my pyramids, which I can do with my diamond hand polishing pads, but I am never happy with the final result, and want to develop a smoother polish. my goal is to eventually sell enough pyramids that I can then save up and get a lap wheel system.

  • Hi There, I was wondering if you could help me. I want to cut the stopper end off a glass decanter stopper. It is a blue stopper about 1/2" thick and 3" long. I need to shine a light through the bottom so it lights up the "handle" part
    regards Frank  

  • Hi i have a question that may not be completely relevant to this video. I placed aluminum foil on my glass window with water and after a couple of days i took it off and the glass has been stained by some sort of chemical process. Would this process you have demonstrated or comthing else work to get rid of the top couple of layers of glass and still look clear? thanks

  • Does aluminum oxide work as well as silicon carbide, or is it less effective? (BTW, you really don't need the soundtrack of the music repeating while you talk, and I'd rather just hear your voice.)

  • Perfect. I have a great Zajecar vase that would be a shame not to fix a flake. Question. The little chip flaked into the surface…. will the little fish eye blemish that flared into the glass a bit come smooth and b removed without noticing there was a flaw and may I send a photo?

  • Thank you, I will research how to. Should I try to remove the he chip before I consider filling. My concern is how the chip flared into the glass. The crystal is quite thick and I am not sure how deep it flared inside. Thank you

  • Ok. Would a photo help you direct me to the best approach. This chip may either be insignificant or major. I am quite uninformed and would not want to use a filler if I can repair without that step. Would you mind seeing a photo?

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