Model Engine Maker

Help! => Specific Engine Help => Topic started by: Nicolas on January 28, 2014, 12:17:23 AM

Title: Need some 50mm glass tube
Post by: Nicolas on January 28, 2014, 12:17:23 AM
Hello,

I need some 50mm diameter glass tube for a displacement cylinder wall (for a stirling engine).

Does anybody know where I could get that from?

If I can't find glass I will have to use plastic....

Thank you for your help,

Nicolas
Title: Re: Need some 50mm glass tube
Post by: Ian S C on January 28, 2014, 12:04:27 PM
Nicolas, maybe if you can find you can find a sales outlet for lab equipment, you might be able to get a suitable pyrex beaker.   Secondary School lab supplies, university.   Ian S C
Title: Re: Need some 50mm glass tube
Post by: pgp001 on January 28, 2014, 01:00:06 PM
What about some subtle modifications to something like a spaghetti jar ?

Phil
Title: Re: Need some 50mm glass tube
Post by: Ian S C on January 28, 2014, 01:27:34 PM
Depends on how much heat Nicolas wants to put on it, not much if he's thinking of using plastic!      Ian S C
Title: Re: Need some 50mm glass tube
Post by: Jo on January 28, 2014, 01:36:31 PM
Sounds like a walk around a cookery shop or your local supermarket is in order. I don't think I know of any beer or wine bottles that size, but you might want to check :DrinkPint:.

How thick a wall is acceptable?

Jo
Title: Re: Need some 50mm glass tube
Post by: fcheslop on January 28, 2014, 02:31:23 PM
As Jo mentions the cookery bit often has some very useful bit n bobs for hot air builders.I bought an air tight plastic container for£1 at an Asda (wallmart) in the UK and a spaghetti jar thingy for £2.99p thats glass   . To buy the same amount of tubing was £14.Also keep an eye in the pound shops for stainless condiments as they can be useful.
See going shopping will take on a whole new light and our lass knows why Im heading for the cookery section :lolb: I get that knowing look :Jester:
cheers
Title: Re: Need some 50mm glass tube
Post by: Steam Haulage on January 28, 2014, 02:33:38 PM
I would try a laboratory glassware supplier -

http://hamiltonlabglass.com/index.html -  these are in Margate UK, they make 50mm diam glass ware so may be able to help.

and these people go up to >300mm ! http://www.johnmoncrieff.co.uk/pdfs/tubesizes.PDF (http://www.johnmoncrieff.co.uk/pdfs/tubesizes.PDF) again in the UK.

There may also be Lab Supply Houses in New Zealand who go up to the size you want, if not in Australia. I know Schott have a place in OZ, I would be surprised if they cannot help you, either from their own products or perhaps by recommending someone.

Jerry
Title: Re: Need some 50mm glass tube
Post by: Jo on January 28, 2014, 02:36:55 PM
... and our lass knows why I'm heading for the cookery section :lolb: I get that knowing look :Jester:


And what reaction do you get from the shop assistance when you get your vernier out and start measuring their bits and pieces  :LittleDevil:
Jo
Title: Re: Need some 50mm glass tube
Post by: fcheslop on January 28, 2014, 02:50:36 PM
Sorry Jo ,NO COMMENT :lolb:
Title: Re: Need some 50mm glass tube
Post by: Marinus on January 28, 2014, 04:40:23 PM
Now I went and measured all the glass bottles in our house :ROFL: Wait there's still a few left :help:
Title: Re: Need some 50mm glass tube
Post by: Marinus on January 28, 2014, 04:43:09 PM
The closes't I found was 42mm and 62mm  :Lol:
Title: Re: Need some 50mm glass tube
Post by: Nicolas on January 29, 2014, 02:43:57 AM
Nicolas, maybe if you can find you can find a sales outlet for lab equipment, you might be able to get a suitable pyrex beaker.   Secondary School lab supplies, university.   Ian S C

I think I have science tomorrow so I'll have a look around the lab, hopefully I will find something :)
Title: Re: Need some 50mm glass tube
Post by: Nicolas on January 29, 2014, 02:46:03 AM
The closes't I found was 42mm and 62mm  :Lol:

The closest I found was 55mm :) only problem is I made the top and bottom plate to suit a 50mm glass tube :facepalm2:

I'm going to use the 55mm to practice as I've never cut glass before.... any tips?

Thanks,

Nicolas
Title: Re: Need some 50mm glass tube
Post by: Nicolas on January 29, 2014, 02:47:10 AM
... and our lass knows why I'm heading for the cookery section :lolb: I get that knowing look :Jester:


And what reaction do you get from the shop assistance when you get your vernier out and start measuring their bits and pieces  :LittleDevil:
Jo

I think I'll do that if I can't find anything in the science lab...... :Lol:
Title: Re: Need some 50mm glass tube
Post by: Steamer5 on January 29, 2014, 07:40:09 AM
Hi Nicolas,
 Ok cutting glass tube, NOTE, I haven't done it on tube this big so it may not work!

When I was at tech, more years ago than I care to remember, we did some glass tubing work, so to cut, use a triangular file edge to score the glass. On the tubing I was using approx 12 mm you only needed to score a small section, on your size may need to score right round. Now the important bit, put some spilt on the score, wrap in cloth (to protect your hands more than one layer please) remember were the score is place your  thumbs on each side of the score push with your thumbs & pull back with the putter part of your hand,( hope this makes sense, a bit of atwisting motion).
If this makes no sense, check YouTube somebody has bound to post a how to!

Cheers Kerrin
Title: Re: Need some 50mm glass tube
Post by: Ian S C on January 29, 2014, 11:25:52 AM
If you were in USA, there is a company called Airpot (I think), they supply glass cylinders of a number of sizes, with graphite pistons (door closers), and free samples can be obtained, these are much sort after by builders of hot air engines.  Don't know if there is an agent in NZ, could well be.   Ian S C
Title: Re: Need some 50mm glass tube
Post by: Steam Haulage on January 29, 2014, 07:39:56 PM
I thoroughly endorse the use of spittle.

Jerry
Title: Re: Need some 50mm glass tube
Post by: derekwarner on January 29, 2014, 08:39:10 PM
There is a video on GOOGLE....where a guy cuts the tops off beer bottles....he wraps a piece of cotton string around the intended cut line.....soaks the string in methylated spirit & then  :Mad: .......lights the string :LittleDevil: then after say 10 seconds he lifts the bottle then turns it upside down & immerses the bottle in water  :facepalm:

I have only successfully cut 5.0 mm boiler quartz tube.........cut with a diamond powder coated 20 diameter disk in a Dremel .....followed by water cooled end face grinding against the same disk........then followed by heating the actual end of the tube to light orange via a pencil gas torch....& let cool in air

The result is that the razor smooth glass end face has lost the visual marking from the grinding ...and is now totally smooth without any fear of cutting anything..........naturally this suggests that heating to the light orange has fluidised the quartz glass......... Derek
Title: Re: Need some 50mm glass tube
Post by: fcheslop on January 29, 2014, 08:44:41 PM
Hi, have a look on Jan Ridders site he has a neat cutting engine
cheers
Title: Re: Need some 50mm glass tube
Post by: Nicolas on January 30, 2014, 04:20:02 AM
Hi, have a look on Jan Ridders site he has a neat cutting engine
cheers

Yes, I have. I think I will make something similar :)
Title: Re: Need some 50mm glass tube
Post by: fumopuc on January 30, 2014, 05:48:48 AM
Hi Nicolas, I know it is far away from NZ, but may be a help to find something similar in your area.
 http://www.ebay.de/itm/6-stueck-Borosilikat-Glasrohr-50-mm-Durchmesser-500-mm-lang-/200986531304  (http://www.ebay.de/itm/6-stueck-Borosilikat-Glasrohr-50-mm-Durchmesser-500-mm-lang-/200986531304)
Title: Re: Need some 50mm glass tube
Post by: Bluechip on January 30, 2014, 02:29:38 PM
Hi, have a look on Jan Ridders site he has a neat cutting engine
cheers

Yes, I have. I think I will make something similar :)

Any chance of a link ??? I can't find it ....  :'(

Dave
Title: Re: Need some 50mm glass tube
Post by: Jo on January 30, 2014, 02:36:21 PM
Here you go Dave  ;):

http://ridders.nu/Webpaginas/pagina_glassnijder/glassnijder_frameset.htm

(Don't forget to hit the button to show the english version.)

Jo
Title: Re: Need some 50mm glass tube
Post by: Bluechip on January 30, 2014, 03:21:04 PM
Here you go Dave  ;):

http://ridders.nu/Webpaginas/pagina_glassnijder/glassnijder_frameset.htm

(Don't forget to hit the button to show the english version.)

Jo

Cheers Jo  :ThumbsUp: 

I went through the L.H. sidebar and couldn't find it ... poor  :old:

Dave
Title: Re: Need some 50mm glass tube
Post by: cfellows on January 30, 2014, 03:31:14 PM
I've used a wet tile saw to cut glass bottles and test tubes.  If you go slow, it works fine.

Chuck