Cannister build.

[Packhorse]

Time for a new cannister (or two).

73mm OD PVC tube 7mm wall (schedule 80?). Dive Rite locking latches.
Overall length not including glands 225mm.

Base 20mm thick PVC stepped down at 10mm to fit inside base of cannister.

Lid 40mm thick PVC. stepped down at 10mm to hold Oring and fit into top of cannister. Contains 2x M16x 1.5mm thread 10 bar cable glands. Rotating collar holding a magnet to activate 2 (or more) reed switches mounted inside the lid that trigger MOSFETs. This will allow for independent switching of LEDs.

 

[wes_wall]

I like this. Does anything limit or locate the rotation of the trigger? If not, you may have trouble keeping it in the on or off position. I don't think it is a good idea to allow friction to hold it in place. If or when it gets knocked it may not be at a convenient time.

 

[Packhorse]

Yes. I have a system for that that I have used on other cannisters. You shall see that be implemented soon.

 

[lil_mac]

Looks great! Keep the photos coming.

 

[eddyet]

can you please provide more info on what reed switch and magnet you are using? thanks!

 

[2sparky]

Id love to see more progress!!! I want to build a canister type light for long night hikes just because I could throw the canister in my pack and just head out with a small head in my hands. I dive too so Id like it to be dive rated as well cause it would get used in both worlds. Im eagerly awaiting more from this thread lol.

 

[Packhorse]

Eeer, sorry. I finished it but didnt take pics of the progress.

The light head can be found in other threads I have started.

I am in the process of building some similar switching systems so will try and photo document those as I go.

 

[gav6280]

Have you pressure tested it yet?

Any thoughts on making some for sale?

 

[MrNaz]

Why have you put MR16x cable glands on the inside of the canister lid as well as the outside?

 

[Packhorse]

Why have you put MR16x cable glands on the inside of the canister lid as well as the outside?

Redundancy!!!
Didnt use it in the end as it took up too much room.

 

[CBR-runner]

are you going to make any for sale?

 

[Packhorse]

I can do do a can for sale. PM me for details with your specification.

 

[Goldigger]

What battery's did you use? total voltage and capacity?
How do you charge it? do you have to open it and remove the batterys or can it be charged externally?

Which glands do i need to use IP68 M16?

I've been looking at making one out of delrin, found a company that sells it pretty cheap 80X250mm £20...

 

[Hallmcc]

Well now, I see where the request comes from.... somebody has been watching your work.

Since the reed switch can only handle very limited current do you use a resistor in front of the reed?

Are there or do you use different Mosfets for current control?

Is your dual switch being used for level control or redundancy?

 

[Packhorse]

What battery's did you use? total voltage and capacity?
How do you charge it? do you have to open it and remove the batterys or can it be charged externally?

Which glands do i need to use IP68 M16?

I've been looking at making one out of delrin, found a company that sells it pretty cheap 80X250mm £20...

I use Trustfire 18650s. You could squeeze 2 rows of 7 although this will not allow any room for PCB. I have made up 8 and 9 cell packs and these work great.
I can of course make longer cans that will allow 3 rows of 18650's.

As you can see from the pics the lid is lathched to allow removal of battery for charging.
Gland is of course the highest IP rated one I could find local. IP 68 10 bar.

Well now, I see where the request comes from.... somebody has been watching your work.

Since the reed switch can only handle very limited current do you use a resistor in front of the reed?

Are there or do you use different Mosfets for current control?

Is your dual switch being used for level control or redundancy?

The current thru the reed is dictated by the current requirements of the FET. Its next to nothing.
I dont know alot about FETs.Just get one that has low impendance and is current rated for the purpose at hand.

No dual switch is to turn on separate LEDs. This can was for my Ring Of Light ( see separate thread). You could use it for redundancy I guess. Just not really sure if its worth it.

 

[MrNaz]

I've been looking at making one out of delrin, found a company that sells it pretty cheap 80X250mm £20...

Delrin is fairly weak when it comes to resisting impacts. It's also not very tolerant of thermal cycling. This makes it a poor choice for a cannister. Thick-walled PVC is cheap, easy to work with and very, very tough. Otherwise, aluminium. Skip delrin, it is not intended to be used for structural applications.

 

[Packhorse]

Its strange that you say that since so many can light manufactures use it.
Salvo and Halcyon to name a few. I am sure they dont use it to save money when PVC is so much cheaper.

I have also used Delrin for cannisters.

I am no plastic expert but it seems very strong and an excellent choice for a canister. It also machines very very well.

The main reason I chose PVC was because it was cheap, in tube form, and easy to glue.

Delrin is Duponts brand name for POM/ Polyoxymethlene AKA acetal.

 

[Goldigger]

Delrin is fairly weak when it comes to resisting impacts. It's also not very tolerant of thermal cycling. This makes it a poor choice for a cannister. Thick-walled PVC is cheap, easy to work with and very, very tough. Otherwise, aluminium. Skip delrin, it is not intended to be used for structural applications.

So why do a successfull company like greenforce and Halcyon manufacture there battery packs from delrin? Im sure that leading companys invest money into material research and find delrin to be a perfect material to machine there products from..

 

[wquiles]

Its strange that you say that since so many can light manufactures use it.
Salvo and Halcyon to name a few. I am sure they dont use it to save money when PVC is so much cheaper.

I have also used Delrin for cannisters.

I am no plastic expert but it seems very strong and an excellent choice for a canister. It also machines very very well.

The main reason I chose PVC was because it was cheap, in tube form, and easy to glue.

Delrin is Duponts brand name for POM/ Polyoxymethlene AKA acetal.

So why do a successfull company like greenforce and Halcyon manufacture there battery packs from delrin? Im sure that leading companys invest money into material research and find delrin to be a perfect material to machine there products from..

+1

I personally have been using Delrin for various machining projects for several years now and can state that Delrin/Acetal is not fairly weak - in fact, quite the opposite.

Diving-wise I am not as experienced as Packhorse and others here in this forum in building canisters, but I have been studying Steve Lindblom's "Divelight Companion", and except for cost, Steve also heavily endorses using Delrin for the Canister as (quote from Steve's book) "extremely rugged and a treat to work with".

Given the amount of money and research that companies like Salvo and Halcyon spend when coming out with a new product to market, and the huge potential liability if something went wrong, I seriously doubt that they would use Delrin if it were not up to the task/use.

Will

 

[65535]

Delrin is fairly weak when it comes to resisting impacts. It's also not very tolerant of thermal cycling. This makes it a poor choice for a cannister. Thick-walled PVC is cheap, easy to work with and very, very tough. Otherwise, aluminium. Skip delrin, it is not intended to be used for structural applications.

That's completely bass-ackwards PVC is brittle and not at all impact resistant, delrin is tough and impact resistant. It is one of the most durable machinable and strongest plastics. Many call it the steel of plastics.