Cutting rough glass

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Subject Author Date
Cutting rough glass M 02-10-2008
Posted by M on February 10, 2008, 11:01 am
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I have a good few lumps of old broken glass some up to about 3" thick and
would like to cut thin sections out but not sure if or how it can be done.
If it can would it be expensive and what percentage woulod be wasted
roughly. Who if anyone does that type of work. What thickness would be the
best to aim for.
It is pieces of a broken lighthouse fresnel lens which we would like in
slivers/sections so that a picture of the lighthouse could be etched onto
them.
Sorry there are som amny questions but hopefully someone may have the
answers.

Thanks Mick



Posted by Adrian on February 10, 2008, 11:45 am
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HI Mick

wrote:

>I have a good few lumps of old broken glass some up to about 3" thick and
>would like to cut thin sections out but not sure if or how it can be done.
>If it can would it be expensive and what percentage woulod be wasted
>roughly. Who if anyone does that type of work. What thickness would be the
>best to aim for.
>It is pieces of a broken lighthouse fresnel lens which we would like in
>slivers/sections so that a picture of the lighthouse could be etched onto
>them.
>Sorry there are som amny questions but hopefully someone may have the
>answers.
>
>Thanks Mick
>

It's the kind of job that somebody with a lapidary (stone-working)
workshop could probably undertake. A water-cooled, diamond 'slab-saw'
(as used for cutting slabs of stone) would do it - and would allow the
glass to be clamped to ensure that the slabs are parallel.

You'd probably need to get the slabs of glass polished afterwards
(lapidary job again, successively finer grades of abrasive followed by
a polish) before doing the etching.

As to wastage - the saw will take out a slot of maybe 1/8" inch,
possibly a little thicker....

Hope this helps ?
Adrian


Posted by Lauri Levanto on February 10, 2008, 12:40 pm
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M wrote:
> I have a good few lumps of old broken glass some up to about 3" thick and
> would like to cut thin sections out but not sure if or how it can be done.
> If it can would it be expensive and what percentage woulod be wasted
> roughly. Who if anyone does that type of work. What thickness would be the
> best to aim for.
> It is pieces of a broken lighthouse fresnel lens which we would like in
> slivers/sections so that a picture of the lighthouse could be etched onto
> them.
> Sorry there are som amny questions but hopefully someone may have the
> answers.
>
> Thanks Mick
>
>
Do I understand right that you want to cut the curved fresnell pieces
radially, to get say ½" slices withthe three polished sides intact.
Interesting job.
How thick are the fresnedd segments. A tile saw may reach 1½"deep
lapidary saws a little deeper. Large blades are thick to prevent
vibration.
What you need is to get together
1. A glass artist with that kind of experience of cold working
with wet belt sanders and plishing planes.
2. A gravestone maker with proper saws.
The etching then is easily found.

-lauri

Posted by charlie on February 11, 2008, 1:32 pm
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>M wrote:
>> I have a good few lumps of old broken glass some up to about 3" thick and
>> would like to cut thin sections out but not sure if or how it can be
>> done.
>> If it can would it be expensive and what percentage woulod be wasted
>> roughly. Who if anyone does that type of work. What thickness would be
>> the
>> best to aim for.
>> It is pieces of a broken lighthouse fresnel lens which we would like in
>> slivers/sections so that a picture of the lighthouse could be etched onto
>> them.
>> Sorry there are som amny questions but hopefully someone may have the
>> answers.
>>
>> Thanks Mick
>>
>>
> Do I understand right that you want to cut the curved fresnell pieces
> radially, to get say ½" slices withthe three polished sides intact.
> Interesting job.
> How thick are the fresnedd segments. A tile saw may reach 1½"deep
> lapidary saws a little deeper. Large blades are thick to prevent
> vibration.
> What you need is to get together
> 1. A glass artist with that kind of experience of cold working
> with wet belt sanders and plishing planes.
> 2. A gravestone maker with proper saws.
> The etching then is easily found.
>
> -lauri

a normal 10" tile saw will cut these ok. you can cut up to about 4" thick.
it won't be polished, which will take normal glass polishing techniques.
someone with a flat lap or vibrolap could do that.



Posted by M on February 12, 2008, 8:07 am
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>
>>M wrote:
>>> I have a good few lumps of old broken glass some up to about 3" thick
>>> and
>>> would like to cut thin sections out but not sure if or how it can be
>>> done.
>>> If it can would it be expensive and what percentage woulod be wasted
>>> roughly. Who if anyone does that type of work. What thickness would be
>>> the
>>> best to aim for.
>>> It is pieces of a broken lighthouse fresnel lens which we would like in
>>> slivers/sections so that a picture of the lighthouse could be etched
>>> onto
>>> them.
>>> Sorry there are som amny questions but hopefully someone may have the
>>> answers.
>>>
>>> Thanks Mick
>>>
>>>
>> Do I understand right that you want to cut the curved fresnell pieces
>> radially, to get say ½" slices withthe three polished sides intact.
>> Interesting job.
>> How thick are the fresnedd segments. A tile saw may reach 1½"deep
>> lapidary saws a little deeper. Large blades are thick to prevent
>> vibration.
>> What you need is to get together
>> 1. A glass artist with that kind of experience of cold working
>> with wet belt sanders and plishing planes.
>> 2. A gravestone maker with proper saws.
>> The etching then is easily found.
>>
>> -lauri
>
> a normal 10" tile saw will cut these ok. you can cut up to about 4" thick.
> it won't be polished, which will take normal glass polishing techniques.
> someone with a flat lap or vibrolap could do that.
>
>
Thanks for the advice and I think I'll go with the 1/4" thick and get it
polished. These are like big rough pebbles mostly and came from the lens
being smashed on the rocks when being replaced years ago. I keep finding
lumps and have given a good few away to visitors who have an interest in
lighthouses or this location. Just thought if not too expensive it would be
nice to be able to give them a piece engraved by a local artist.
Thanks again to all for the advice and I am taking some down on holiday with
me in a few weeks and will try to locates a firm in the
Yorkshire/lancashir/Cheshire area that can do the job.

Mike



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