Spectacle glass

Monty
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Joined: Fri Mar 03, 2017 9:44 am

Spectacle glass

Postby Monty » Fri Jun 30, 2017 1:30 pm

Does anybody have any suggestions of the best solution of making & fitting 'glass' to the cab of a loco? The loco is a Kitson 0-4-0 tank with round spectacle glass @ front & rear of the cab. I need to somehow make or buy some circular 'glass' to fit the apertures. How do you successfully create the correct size diameter pieces or can they be purchased?

dal-t
Posts: 605
Joined: Mon Jan 11, 2010 8:06 pm

Re: Spectacle glass

Postby dal-t » Fri Jun 30, 2017 1:36 pm

Kristal Klear!
David L-T

Knuckles
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Re: Spectacle glass

Postby Knuckles » Fri Jun 30, 2017 2:19 pm

I support the above suggestion too. Easy to apply and looks good. Also accepts gloss varnish spray with no issue.

I wouldn't want to risk spraying matt or satin on though.
“He who dares not offend cannot be honest.” Thomas Paine

http://www.shapeways.com/shops/sparksho ... eationsscc
Mostly offering Loco kits & bits in 4mm.
SCC Photon Resin Prints Price list
download/file.php?id=19320

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MarkS
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Re: Spectacle glass

Postby MarkS » Fri Jun 30, 2017 3:04 pm

I have used Kristal Klear, and gloss medium successfully - I have also used a leather punch on clear styrene if the spectacle size is right, with the above or canopy glue to hold the glazing piece in place. http://alexnld.com/product/revolving-leather-canvas-belt-punch-punching-plier-hole-tool-6-tube/
Cheers,

Mark.
"In the end, when all is said and done, more will have been said than done..."

Monty
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Joined: Fri Mar 03, 2017 9:44 am

Re: Spectacle glass

Postby Monty » Fri Jun 30, 2017 3:36 pm

Many thanks all. I had completely forgotten about KK as I have not used it for years! An age thing!

Monty
Posts: 46
Joined: Fri Mar 03, 2017 9:44 am

Re: Spectacle glass

Postby Monty » Sat Jul 01, 2017 9:18 pm

Just one point regarding Krystal Klear. It says suitable for a gap up to 1/4 inch. The size aperture on my model is a little larger so will it work ok?
Regards.

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steamraiser
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Re: Spectacle glass

Postby steamraiser » Sat Jul 01, 2017 11:00 pm

Ambis sells thin clear acrylic, 0.2mm IIRC.

Gordon A

Knuckles
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Re: Spectacle glass

Postby Knuckles » Sat Jul 01, 2017 11:38 pm

Monty wrote:Just one point regarding Krystal Klear. It says suitable for a gap up to 1/4 inch. The size aperture on my model is a little larger so will it work ok?
Regards.


Possibly. I'm sure the 1/4 is an approximation of a size easy to get a repeatable result. I've found Loading a cocktail stick with a lot on and spinning it around will layer the inside, then reloading and repeating will start to bridge the gap until the white bubble is formed.

Worth a shot for a couple of quid either way.
“He who dares not offend cannot be honest.” Thomas Paine

http://www.shapeways.com/shops/sparksho ... eationsscc
Mostly offering Loco kits & bits in 4mm.
SCC Photon Resin Prints Price list
download/file.php?id=19320

dal-t
Posts: 605
Joined: Mon Jan 11, 2010 8:06 pm

Re: Spectacle glass

Postby dal-t » Sun Jul 02, 2017 7:16 am

The problem with filling larger gaps is you tend to get a bulls-eye effect. Careful use of gravity (i.e. turning the model around as the KK dries) can alleviate this, but it's hard to entirely avoid the impact of surface tension and capillary effect making a form of lens. I suspect that's why Microscale quote the 1/4 inch limit, since as Knuckles says it's actually quite easy to build it up across a wider opening. I did this a while ago for the windows of a Sentinel steam lorry, but found it just didn't look right for the main windscreen, although the 'toplights', which were thinner, were fine. Of course, by the time the opening gets that big it is becoming easier to cut clear plasticard/glass/perspex to fit, and you can still use KK (or Revell canopy glue) to fix it.
David L-T

Monty
Posts: 46
Joined: Fri Mar 03, 2017 9:44 am

Re: Spectacle glass

Postby Monty » Sun Jul 02, 2017 9:05 pm

The Ambis sheet sounds interesting if I can get close to a circle. Having said that, inside the small cab it will probably not be too noticeable if they are not perfectly round.

Enigma
Posts: 219
Joined: Tue Aug 13, 2013 2:49 pm

Re: Spectacle glass

Postby Enigma » Mon Jul 03, 2017 8:57 am

I'm sure I remember someone cutting a slice of clear Perspex rod, polishing it and then sticking it in the hole. Getting the correct diameter could be tricky though unless you have a handy lathe (or a drill held in a vice?). I tried it with some 'clear' sprue from the windows of an American structure kit but it was not a success. The plastic was to soft and wouldn't polish.

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steve howe
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Re: Spectacle glass

Postby steve howe » Tue Jul 04, 2017 10:38 am

If you get some brass tube of the appropriate diameter and file or turn the end down to a knife-edge, you can punch discs out of clear thin styrene.

Steve

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jim s-w
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Re: Spectacle glass

Postby jim s-w » Tue Jul 04, 2017 11:21 am

I just used a hole punch and some clear plastic from a Bachmann box.


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