glass discs?
Norman Billingham
and preferably 1.5 mm thick (though 2mm is OK). They are for the windows in
optical toys so don't need to be of high optical quality. A local glass
firm made some for me with a diamond core drill, but they are not very
good - loads of chipping round the edges. A friendly glassblower did a much
better job but I can't call in that favour too often. It's not so difficult
to find precision optical windows at a price but I don't need that sort of
quality. Google has turned up nothing, but there must be a supplier out
there as commercial kits for e.g. kaleidoscopes have three in them.
Hopefully the collective wisdom of the groups may have an idea of a source?
I only need about a dozen. All suggestions gratefully received.
Bob Minchin
polycarbonate or perspex perhaps?
Bob
gazz
news:fqidnRT43e9mC4TW...@bt.com...
> I've been trying to find a source of clear glass discs, around 35mm
> diameter and preferably 1.5 mm thick (though 2mm is OK). They are for the
> windows in optical toys so don't need to be of high optical quality.
find some 35mm diamiter glasses, as in the type you drink out of, and remove
the tall portion leaving just the base?
OG
> diameter and preferably 1.5 mm thick (though 2mm is OK).
Any cheap torches available ?
mark
i remember about three years ago when looking for glass disks for my
waste oil burner ..
the local glass guy showed me a card with samples on ..
these were about the diameter you want ..
and if i can remember they had pilkington written on the card.
they were not big enough for my use ..i ended up buying candle
thingies from woolworths.
if you want a lot of them ..then a trip to St-Asaph business park
North Wales maybe will yield results.......thats were the UK optical
industry is, including specialist branches of pilkington and many
other optical companies.
Lot of top secret stuff goes on there ..so don't be expect to get past
the gates at a few of the companies.
all the best.markj
Mark Rand
You don't say what sort of quantities you are looking for.
After getting similar results from a local glass firm (problem in my case was
they were far too thick), I got a diamond core drill a bit bigger than I
needed and cut two disks from a sheet of glass. Then I clamped each between
two mandrels on the lathe with double sided tape for retention and a rotating
tailstock centre for pre-load. Then I used a diamond hone and water to grind
the diameters and edges down to what I needed. These were for 3/4" diameter
disks for oil sight glasses. The 2mm glass came from a picture frame in the
workshop that I'd accidentally smashed when moving it :-(
It took less time to cut and grind the glass than it had to go to the glass
shop and negotiate for a handful of cores!
Mark Rand
RTFM
John Rumm
> I've been trying to find a source of clear glass discs, around 35mm diameter
> and preferably 1.5 mm thick (though 2mm is OK). They are for the windows in
> optical toys so don't need to be of high optical quality. A local glass
> firm made some for me with a diamond core drill, but they are not very
> good - loads of chipping round the edges. A friendly glassblower did a much
> better job but I can't call in that favour too often. It's not so difficult
If you only need a dozen, could you not pay him to make them for you?
> Hopefully the collective wisdom of the groups may have an idea of a source?
> I only need about a dozen. All suggestions gratefully received.
Other options would include an "ordinary" glass merchant of the type
that does glass cut to size. They can usually do round windows, clock
glasses etc, and hence may be able to do small sizes.
If that fails how about cutting your own? A wet tile cutter may do the
trick. Alternatively a good diamond glass cutter with a trammel to make
your scored circle, then a few radial cuts away from it before tapping
or heating/cooling to snap off the segments.
Another option might be to cut a polygon with straight edges just a bit
over size and then grind it down to the final fit using a carborundum
stone.
--
Cheers,
John.
/=================================================================\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\=================================================================/
Bruce
<norman.at.tumulus.org.uk> wrote:
Does it need to be glass? It would seem an ideal application for
acrylic sheet, such as Perspex.
For example:
http://www.wickes.co.uk/Acrylic-Sheet/invt/210001
It has a protective film both sides which should be left on until you
have finished shaping it.
NT
> Norman Billingham wrote:
> > I've been trying to find a source of clear glass discs, around 35mm diameter
> > and preferably 1.5 mm thick (though 2mm is OK). They are for the windows in
> > optical toys so don't need to be of high optical quality. A local glass
> > firm made some for me with a diamond core drill, but they are not very
> > good - loads of chipping round the edges. A friendly glassblower did a much
> > better job but I can't call in that favour too often. It's not so difficult
>
> If you only need a dozen, could you not pay him to make them for you?
>
> > Hopefully the collective wisdom of the groups may have an idea of a source?
> > I only need about a dozen. All suggestions gratefully received.
>
> Other options would include an "ordinary" glass merchant of the type
> that does glass cut to size. They can usually do round windows, clock
> glasses etc, and hence may be able to do small sizes.
>
> If that fails how about cutting your own? A wet tile cutter may do the
> trick. Alternatively a good diamond glass cutter with a trammel to make
> your scored circle, then a few radial cuts away from it before tapping
> or heating/cooling to snap off the segments.
>
> Another option might be to cut a polygon with straight edges just a bit
> over size and then grind it down to the final fit using a carborundum
> stone.
I tried cutting glass on my wet tile cutter. It did cut, but chipped
quite badly. I assumed any glazier could make them though.
NT
Adrian Brentnall
If you are prepared to make them yourself then a diamond core drill in a
drill press will do the job - you'll want to drill slowly and with lots
of water to cool the work. If the ones you had were chipped then they
were either drilled too fast, without adequate cooling or the core drill
was worn out...
To buy off the shelf - you want to talk to people who supply material
for glass fusing (jewellery - that sort of thing)
One supplier is Delphi Glass - they are in the USA and have 'micro-thin
1.25" glass circles'(don;t know how thing that would be but you could
ask them..
http://www.delphiglass.com/index.cfm?page=itemView&itemsysid=196682
How flat / edge-smooth do they need to be ? Another way would be to cut
the circles using a lens cutter or a proprietary 'turntable' cutter, and
then either grind the edges to smooth or give them a light fuse in a kiln...
I made something similar as filters for some led lamps for somebody
recently -
they were in pale yellow- but clear would be just as easy....
Drop me an email if you'd like to chat about it
(adr...@inspired-glass.com). I'm in Ireland - but postage shouldn't be
too much of a problem..
Adrian
Andrew Mawson
Norman,
Relatively easy to cut them yourself. Turn up a copper 'tube' with an
inside diameter of the required disk. Mount in vertical mill, place
glass sheet on cardboad and secure. Build a dam of putty or plastecene
where the hole is needed, fill with light oil. Lower copper tube at
low revs into oil having charged the copper with carborundum powder
(valve grinding paste). You need to use hand quill feed or a light
spring so as not to press too hard. Suprising how quickly it cuts.
BUT - if they are for toys is plain glass good enough - should it not
be toughened or perhaps polycarbonate?
AWEM
mick
> I've been trying to find a source of clear glass discs, around 35mm
> diameter and preferably 1.5 mm thick (though 2mm is OK). They are for
> the windows in optical toys so don't need to be of high optical quality.
<snip>
Are you allowed to use glass in toys at all nowadays?
--
Mick (Working in a M$-free zone!)
Web: http://www.nascom.info
Filtering everything posted from googlegroups to kill spam.
The Medway Handyman
Interesting that, but can you get 35mm copper tube?
--
Dave - The Medway Handyman
www.medwayhandyman.co.uk
Bob Minchin
Bob
devonsteve
wrote:
How about trying your local welders suppliers , we used to wear
cutting goggles with replaceable clear glass lenses ?
Kevin Poole
Norman Billingham wrote:
> I've been trying to find a source of clear glass discs, around 35mm diameter
> and preferably 1.5 mm thick (though 2mm is OK). They are for the windows in
> optical toys so don't need to be of high optical quality.
<snip>
>
> Hopefully the collective wisdom of the groups may have an idea of a source?
> I only need about a dozen.
Clockmakers' suppliers Meadows and Passmore list 2mm flat glass rounds,
and will do special sizes for orders of 10 or more. www.m-p.co.uk
Tempus, in Exmouth, do very clever stuff with glass - bevelled edges,
fitting to bezels, and so on, as well as flat circles. No web site, so
01395 270058.
You're looking at over 3 quid each for either of those places.
--
Kevin Poole
****Use current date to reply (e.g. dec...@mainbeam.co.uk)****
Andy Burns
> can you get 35mm copper tube?
Yes, copper tubes go a long way above the 15, 22, 28mm sizes used
domestically ... 35, 42, 54, 67, 76, 108, 133, 159 and 219mm are available.
Steve Firth
> Google has turned up nothing, but there must be a supplier out
> there as commercial kits for e.g. kaleidoscopes have three in them.
If they are still going, Chance Glass in Great Malvern used to knock
similar glass blanks out at reasonable prices. I've just checked the web
and they still appear to be in business:
The Medway Handyman
Ah. Didn't know that - thanks.
Archon
break glass emergency switch. 20 for $20. You might need to ask the
size/thickness.
JC
Steve R.
"NT" <meow...@care2.com> wrote in message
news:322a60c0-423b-4f19...@r5g2000yqb.googlegroups.com...
On Dec 5, 4:51 am, John Rumm <see.my.signat...@nowhere.null> wrote:
I tried cutting glass on my wet tile cutter. It did cut, but chipped
quite badly. I assumed any glazier could make them though.
NT
OK, time for me to but in! Amateur telescope makes do this all the time!
First, never try to just do one piece of glass, you need a stack. The outer
pieces should be discarded. One good way is to embed the stack of glass in
plaster of paris. No need for a diamond hole saw, a simple cutter can be
made from sheet metal, formed into a tube. You will need some slits in it.
The actual cutting media is carborundum grains obtainable from
lapidary/rockhound shops, or amateur telescope maker suppliers. Use ordinary
plasticine to form a dam around the area the cutter will enter. Make slurry
of carbo and water, and run the cutter slowly, with gentle downward
pressure. You will have a stack of glass disks in no time. The outer ones
will be chipped a bit, the inner ones should be near perfect.
Steve R.
Steve R.
shatter into tiny pieces!
Steve R.
Norman Billingham
with a core drill or carborundum, and polycarb or acrylic are the fallback
position if all else fails. However, I was very surprised how difficult
they are to find commercially. I had assumed that since there are so many
torches, kaleidoscopes etc about, a Google search would easily turn up a
source of supply but it appears not.
Anyway, as always the group was helpful and I am grateful.
Roger Mills
Norman Billingham <norman.at.tumulus.org.uk> wrote:
I assume that you're referring to the question about glass discs - but if I
hadn't seen the original thread, I wouldn't have a clue what this post was
about!
--
Cheers,
Roger
______
Email address maintained for newsgroup use only, and not regularly
monitored.. Messages sent to it may not be read for several weeks.
PLEASE REPLY TO NEWSGROUP!
Owain
> Norman Billingham wrote:
> > Thanks to all for the useful contributions. ...
> I assume that you're referring to the question about glass discs - but if I
> hadn't seen the original thread, I wouldn't have a clue what this post was
> about!
Well, it did have a "References" header so your newsreader should have
displayed, or allowed you to load, preceding messages
Owain
Dave Liquorice
> I had assumed that since there are so many torches, kaleidoscopes etc
> about, a Google search would easily turn up a source of supply but it
> appears not.
Any CE marked toy and most torches won't have glass in them, too much
of a hazard when it breaks particulary in a toy. You don't seem to
have picked that up when it was mentioned earlier.
--
Cheers
Dave.
Roger Mills
Well my newsreader (the dreaded OE - albeit with Quotefix) just displayed it
like a new thread - with no hint (such as a Re: in the title, or quoted text
in the body) that it belonged to an existing thread.
Now you have pointed it out, and I have displayed the whole thread, I can
see that it does - but it was by no means obvious. Perhaps it would have
been safer to have changed the subject just to "Glass Discs - Thanks" or
somesuch, and/or to have quoted the original question.
Cliff Coggin
"Roger Mills" <watt....@googlemail.com> wrote in message
news:7o27dkF...@mid.individual.net...
> In an earlier contribution to this discussion,
> Owain <spuorg...@gowanhill.com> wrote:
>
>> On 6 Dec, 15:40, "Roger Mills" wrote:
>>> Norman Billingham wrote:
>>>> Thanks to all for the useful contributions. ...
>>> I assume that you're referring to the question about glass discs -
>>> but if I hadn't seen the original thread, I wouldn't have a clue
>>> what this post was about!
>>
>> Well, it did have a "References" header so your newsreader should have
>> displayed, or allowed you to load, preceding messages
>>
>> Owain
>
> Well my newsreader (the dreaded OE - albeit with Quotefix) just displayed
> it like a new thread - with no hint (such as a Re: in the title, or quoted
> text in the body) that it belonged to an existing thread.
>
> Now you have pointed it out, and I have displayed the whole thread, I can
> see that it does - but it was by no means obvious. Perhaps it would have
> been safer to have changed the subject just to "Glass Discs - Thanks" or
> somesuch, and/or to have quoted the original question.
> --
> Cheers,
> Roger
That's odd. I too use OE and the message displayed within the original
"Glass discs" thread. Perhaps the difference is your addition of Quotefix,
whatever that is.
Cliff Coggin.
JG
> I've been trying to find a source of clear glass discs, around 35mm diameter
> and preferably 1.5 mm thick (though 2mm is OK).
I've been busy with other 'Christmas' type events for the past week so
haven't logged on to the newsgroups but am amazed that no-one in the 27
replies has mentioned Watch Glasses.
They are the perfect readily available option and make it silly to even
think of 'making your own'.
Cousins list 1.5mm thick upto 34mm dia and 1.8mm thick upto 36mm dia.
These are flat mineral glass with polished bevel edges. If you can get
away with 1mm thick then they also list up to 46mm.
The range available is in 0.1mm dia increments generally from 13mm but
for some types (thicknesses) 24mm (I only mention this since others
might see an easy option for other purposes).
Their web site is www.cousinsuk.com and phone number 017 0875 7800.
JG
Roger Mills
> "Roger Mills" <watt....@googlemail.com> wrote in message
> news:7o27dkF...@mid.individual.net...
>> In an earlier contribution to this discussion,
>> Owain <spuorg...@gowanhill.com> wrote:
>>
>>> On 6 Dec, 15:40, "Roger Mills" wrote:
>>>> Norman Billingham wrote:
>>>>> Thanks to all for the useful contributions. ...
>>>> I assume that you're referring to the question about glass discs -
>>>> but if I hadn't seen the original thread, I wouldn't have a clue
>>>> what this post was about!
>>>
>>> Well, it did have a "References" header so your newsreader should
>>> have displayed, or allowed you to load, preceding messages
>>>
>>> Owain
>>
>> Well my newsreader (the dreaded OE - albeit with Quotefix) just
>> displayed it like a new thread - with no hint (such as a Re: in the
>> title, or quoted text in the body) that it belonged to an existing
>> thread. Now you have pointed it out, and I have displayed the whole
>> thread,
>> I can see that it does - but it was by no means obvious. Perhaps it
>> would have been safer to have changed the subject just to "Glass
>> Discs - Thanks" or somesuch, and/or to have quoted the original
>> question.
>
> That's odd. I too use OE and the message displayed within the original
> "Glass discs" thread. Perhaps the difference is your addition of
> Quotefix, whatever that is.
>
> Cliff Coggin.
I doubt if it's that. But I *do* have "Hide Read or Ignored Messages" set in
the View menu - so it doesn't display previous parts of the thread - only
the new messages. If I turn that off, the whole thread is then displayed,
and I can indeed see that the Thanks message is part of the original thread.
The Medway Handyman
Same here
>Perhaps the difference is your addition of
> Quotefix, whatever that is.
I've got Quotefix :-)
robgraham
> In an earlier contribution to this discussion,
>
Ah - at last a justification for using Google Groups. It's all one
continuous thread there and hence quite understandable.
Rob
the wizard
> I've been trying to find a source of clear glass discs, around 35mm diameter
> optical toys so don't need to be of high optical quality. A local glass
> firm made some for me with a diamond core drill, but they are not very
> good - loads of chipping round the edges. A friendly glassblower did a much
> better job but I can't call in that favour too often. It's not so difficult
> to find precision optical windows at a price but I don't need that sort of
> quality. Google has turned up nothing, but there must be a supplier out
> there as commercial kits for e.g. kaleidoscopes have three in them.
>
> Hopefully the collective wisdom of the groups may have an idea of a source?
> I only need about a dozen. All suggestions gratefully received.
Hi Norman,
I can bring my glass circle trammel device down to Sandown for you to
try, if you would like. It might be war time manufacture but should
still work.
See you on the stand, anyway.
Ned Ludd
Norman Billingham
"JG" <j...@crescentcomputing.co.uk> wrote in message
news:4b1cd397$1...@news.x-privat.org...
Brilliant - thanks.
I had thought of watch glasses but the only ones I could find easily were
convex - these look like the perfect solution for what I need.
Clint Sharp
<norman.at.tumulus.org.uk@?.?.invalid> writes
> A local glass
>firm made some for me with a diamond core drill, but they are not very
>good - loads of chipping round the edges.
Cut too fast? Can't they bevel the edges slightly for you? Cut your own
from greenhouse glass and flame polish the edges?
>Google has turned up nothing, but there must be a supplier out
>there as commercial kits for e.g. kaleidoscopes have three in them.
E-mail the suppliers of the kits and ask if you can buy the windows
separately?
>
>
>
>Hopefully the collective wisdom of the groups may have an idea of a source?
>I only need about a dozen. All suggestions gratefully received.
>
Scientific glassware catalogues? You'll probably find something designed
for chemistry or microscopy.
>
--
Clint Sharp
David Littlewood
<cl...@clintsmc.demon.co.uk> writes
wide variety of colours, and ironically "clear" might be hard to find.
If 32mm will do, and you can find a suitable colour, they should work
for you.
David
--
David Littlewood