# Glow in the dark keyring

12 Steps
Awesome, Awesome, Awesome mini project that i recently discovered on this web site:

http://start-model-engineering.co.uk/2012/01/glow-in-the-dark-keyfob/

It will be my next project for my after school engineering club. Check the vid to see the key rings in action!

Learning Objective

By following a detailed set of instructions and videos from the Instructables website, yr9 students (13 year olds) will make a glow-in-the-dark key ring. The students will recall previously learnt skills on the metal lathe, e.g. facing off, centre drilling, and drilling to a given depth. This project will introduce the students to a milling machine and an indexable head. The project teaches how to use these precision tools to a high degree of accuracy and the students must aim to work within a tolerance of +/- 0.1mm. To achieve this tolerance the students will have to use basic mathematical calculations of linear measurements and angular divisions.
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## Step 1: Cut material to length

• Use a hacksaw to cut either Ø9mm brass or aluminium to 90mm long
divided head says: Feb 20, 2012. 6:24 PM
Very nice version.

Not too sure about the glass if you drop it? Acrylic rod is cheap :-)

Glad you liked the idea ;-)

Ralph.
Hi,

The glass is pyrex so its pretty tough and when bought through the schools science department its surprisingly ......cheaper than acrylic!

You should definitely put your LED torches on instructables people will love them :)

Jonny
Hi Jonny,

Fair enough, just a thought on the glass :-)

Not upto speed on how this all works yet.... But the torches will be possibly the only thing I try as the keyring projects are the simplest things I make.

Glad you can link to videos on here. That'll save hours. The torches are a little more complex than these! :-)

Ralph.

..I have made two of the torches as well :)
Ahh, good man :-)

Well if I can't get this site figured out I'll let you know.... you'll have to post that build too! lol

I like your gearbox lamp BTW. Top job.

Ralph.
black hole says: Feb 19, 2012. 8:48 PM
Amazing. Are you going to sell these? I would love to own one.
P.S. I voted for this and for your aluminium keyring. Good luck!
jonnyd55 (author) in reply to black holeFeb 20, 2012. 9:17 AM
Hi, thanks for the vote.....unfortunately all my spare time is consumed by instructables.........Robot, please can i have my life back!
zakamooza says: Feb 18, 2012. 3:16 AM
wouldn't be easier to use a tube instead of using a solid rod and drilling the center?
jonnyd55 (author) in reply to zakamoozaFeb 18, 2012. 10:59 AM
Hi, yeah sometimes that is possible and saves loads of time, however, tubes are no good if you need a solid end..... or..... the internal diameter of the tube can sometimes be too big....or....the wall thickness too thin. But occasionally tubes are awesome :)
zakamooza in reply to jonnyd55Feb 19, 2012. 1:12 AM
ok, i would try this if i had the right equipment :(
Kryptonite says: Feb 16, 2012. 1:29 PM
Absolutely amazing build, may I ask what inspired the make?
jonnyd55 (author) in reply to KryptoniteFeb 17, 2012. 12:48 AM
Hi, thanks :) the idea is not mine :( if you go to the intro there is a link to the website where i found the idea jonny
Kryptonite in reply to jonnyd55Feb 17, 2012. 9:44 PM
Ahh, I missed that! I love how you made yours different and unique.
desertsniper says: Feb 15, 2012. 1:38 PM
what about using tritium vial with a plastic coating? outstanding project by the way! i hope to get a lathe and milling machine in the future.
Spokehedz in reply to desertsniperFeb 16, 2012. 7:59 AM
You could build a cage around the plastic vial, but you can't open it. The phosphor is on the inside of the plastic vial and that is what glows.

The Tritium is emitting beta particles which only travel a short distance through the air--something like, 1/4 of an inch i think--and it completely blocked by the layer of dead skin cells on your body. So it is safe, but you can't get it out of the bottle without it getting messed up.

Good thought though!
desertsniper in reply to SpokehedzFeb 16, 2012. 2:05 PM
yeah, i was not talking about tranfering the tritium gas and phosphor, just putting it in a plastic tubing you protect it from bumps. then inserting it in the key chain.
jonnyd55 (author) in reply to desertsniperFeb 15, 2012. 2:13 PM
Thanks.... get them sooner rather than later........ Lathes and mills are the coolest machines..........dare i say it even cooler than laser cutters! if you are in the uk and want advice on where is best to get the machines from, let me know :)
desertsniper in reply to jonnyd55Feb 17, 2012. 7:21 AM
Well i live in the united states, but i will definately ask you if i have any questions! i need to buy a new belt sander (i just burned the motor out on mine) then i need a knife belt grinder and a forge. after i get that equipment i plan on buying the milling and lathe gear.
boris400 in reply to jonnyd55Feb 17, 2012. 2:35 AM
I live in the south east of England. do you know where i could get a cheap lathe or milling machine as i am a student.
jonnyd55 (author) in reply to boris400Feb 17, 2012. 2:35 AM
There are a few different options, what's your budget? And what sort of things are you interested in making?
boris400 in reply to jonnyd55Feb 17, 2012. 4:04 AM
My budget is as cheap as possible. i really wanted to make small projects like your glow in the dark key chain above and some small model steam engines etc. so its nothing too big.
jonnyd55 (author) in reply to boris400Feb 17, 2012. 5:26 AM
Hmm then i would suggest ebay or gumtree and buy a second hand one it just requires a bit of time to wait for one to come available...however.....if you are unable to collect a heavy lathe or just want a new one then dont spend less than £600 or it will be rubbish...... the cheapest machines are from axminster or chester tools. if you are looking at a particular machine, and would like my opinion of it just email me on my instructables account.
boris400 in reply to jonnyd55Feb 17, 2012. 6:57 AM
thanks
canucksgirl says: Feb 13, 2012. 12:48 PM
Hey that looks neat. Almost looks like a bullet casing. I wonder if that couldn't be modified into a glow in the dark key ring... hmmm?
jonnyd55 (author) in reply to canucksgirlFeb 13, 2012. 12:58 PM
Hi, yes one could.....unfortunately bullets in the UK are not easy to find or legal! :( Strict British rules on fun frown upon guns.
criggie in reply to jonnyd55Feb 16, 2012. 12:27 PM
A GITD Bobby's Truncheon perhaps?
canucksgirl in reply to jonnyd55Feb 13, 2012. 1:25 PM
wow.... I didn't know that. Here in Canada, we're not as "gun happy" as our neighbours to the south, but getting bullets isn't much of a problem here... Don't they have firing ranges where you could scoop up some spent rounds?
jonnyd55 (author) in reply to canucksgirlFeb 13, 2012. 1:44 PM
I could be wrong but i think we are only aloud 0.22 rifles in uk = tiny cartridges
Osquar in reply to jonnyd55Feb 15, 2012. 4:14 AM
If you have a hunter friend with a so called "elephant gun", maybe he has a couple of empty casings? My dad has one of those and the casings are, I think, big enough.
dr_insane in reply to OsquarFeb 15, 2012. 10:03 AM
Only .22 in the UK? I have a few clips of deactivated 5.56 standard NATO rounds, AK47 mag and rounds (deactivated), 1 inch minigun round, anti aircraft round, and quite a few blank empty cases.
jonnyd55 (author) in reply to dr_insaneFeb 15, 2012. 11:11 AM
blank rounds yes.....but..... whats the biggest live round we are allowed in uk?
Boy1er1990 in reply to jonnyd55Feb 16, 2012. 4:05 PM
I know here in Ireland I legally own a .222, the cartridge on them is similar to a AK47. Im not sure on UK laws though, .22?
ttatchell in reply to jonnyd55Feb 16, 2012. 9:47 AM
Its 7.62mm i think
If not, its what ever your firearms ticket allows you to hold.
I know you can hold 7.62mm rounds with a valid ticket.
dr_insane in reply to ttatchellFeb 16, 2012. 1:29 PM
Do shotguns count? I'm pretty sure you can have a 9mm pistol if you're in a club, which is bigger, but smaller than a 7.62.
And if you're thinking seriously large some people have cannons(if you live in a castle), but they don't have cases.
dr_insane in reply to dr_insaneFeb 16, 2012. 1:32 PM
Also apart from the crimped end, why wouldn't a blank case be suitable for most projects?
JonC says: Feb 16, 2012. 8:07 AM
Very nice idea.

I know you can own quite a range of rifles in the UK, I have friends who own .222 and .308 rifles which are considerably larger rounds than .22 but still a way off the 9x90 mm given in the description. For this you need something like a .50 BMG which again can also be owned legitimately in the UK but would be very difficult to obtain the license for as you are required to explain to the police what you need it for!

My advice if you want a rifle round shaped one is buy some larger brass (12mm or .5inch and while its in the lathe turn the end down to give the correct shape and thread it internally as per the guide. then use either another bit of the brass another metal for a contrast or buy a bolt of the correct thread and turn it to a curved point on one end similarly to the instructable. Also casings tend to be quite thin and would be difficult to drill leaving a clean hole.

This will certainly be easier than trying to find .50 BMG casings!
jonnyd55 (author) in reply to JonCFeb 16, 2012. 9:05 AM
Hmmm........ Would the police accept 'key rings' as a good reason for a 50 cal licence? you raised a good point about the casing being difficult to machine! ...........Oh and for any one thinking of making a bullet version......please......please.....please ensure you empty the powder before you drill it!!!! ;)
iminthebathroom says: Feb 16, 2012. 8:04 AM
Excellent