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using cam locks for burst discs-

Post questions and info about hybrid (compressed gas with fuel) powered cannons here. This includes discussion about fuels, ratios, ignition systems, build types, safety, and anything else relevant.
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using cam locks for burst discs-

Unread postAuthor: JDP12 » Sun Apr 27, 2008 6:58 pm

hey all, i'm sick of my union leaking, so i've decided to use cam locks. my only question is- how easy is it to use them with burst discs- like how much do the burst discs inhibit them locking together?
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Unread postAuthor: biggsauce » Sun Apr 27, 2008 7:12 pm

Have you ever used them? They have a rubber ring that the male connector sits on, and as long as your burst disk isn't obscenely thick, you shouldn't have a problem with sealing, however, the thicker the disk, the harder it will be to lock in.

But you can solve this by thinning out the rubber ring, or using thin burst disks.

What do you use as your disks?
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Unread postAuthor: THUNDERLORD » Sun Apr 27, 2008 7:14 pm

Looks like starman would be the expert on that.
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Unread postAuthor: starman » Sun Apr 27, 2008 7:30 pm

I'm using them this way

Image

Image

Image

Image

2 crossed layers of masking tape holds back 30-40 psi, 4 crossed layers holds back 80-90 psi. I am able to fully contain an ignition of a 1x advanced combustion with a 4 layer version of this... :shock:

I have tried non stick versions of these disks and they do not hold quite as well...tend to slip from the seal around 50-60 psi.

You can build a camlock burst disk adapter with a male camlock connected back-to-back with another female camlock to which you can then attach your favorite barrels...just creates a little barrel dead space between the ammo and the burst disk. I've not found it to be any detriment at all.

I'm also using the burst disk barrel stumps you see here on my noise makers I'm building.

THUNDERLORD wrote:Looks like starman would be the expert on that.


Indeed sir... :wink: Not sure about expert, but I have been fiddling around with them some.
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Unread postAuthor: JDP12 » Sun Apr 27, 2008 7:52 pm

hmm cool thanks.. do those rubber ones hold up to hybrid mixes- i.e. x5, x6? I'm lookin at some aluminum ones on mcmaster.. i assume those work the same, just stronger?

starman- is that like the blue painters tape??
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Unread postAuthor: starman » Sun Apr 27, 2008 8:05 pm

ilovetoblowthingsup wrote:hmm cool thanks.. do those rubber ones hold up to hybrid mixes- i.e. x5, x6? I'm lookin at some aluminum ones on mcmaster.. i assume those work the same, just stronger?

starman- is that like the blue painters tape??


These plastic ones are good to 150 psi rating, the aluminum ones are rated to 250 psi. I have some of those aluminum ones as well and plan on using them on a low "x" hybrid, 3-4x max. configuration I'm working on.

Yes that's the blue Scotch 2" masking tape. It's very easy to work with and available everywhere. One roll lasts a looong time doing this job.
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Unread postAuthor: JDP12 » Sun Apr 27, 2008 8:08 pm

k... i would think the aluminum ones could hold up to a 6x mix even though its closer to 400 psi... wouldn't you?

where do you get your rubberish ones and aluminum ones?? I know you can get aluminum ones on mcmaster, but i haven't been able to find the rubberish ones..
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Unread postAuthor: THUNDERLORD » Sun Apr 27, 2008 8:13 pm

@ starman, that was cool!!!
I was hoping you would maybe see my reply and reply back.
(if not,that he could reference your post), and everything worked out.
As for this topic, looks like you are the expert too!!!
That was Great, Thankyou :wink:
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Unread postAuthor: starman » Sun Apr 27, 2008 8:15 pm

ilovetoblowthingsup wrote:k... i would think the aluminum ones could hold up to a 6x mix even though its closer to 400 psi... wouldn't you?

where do you get your rubberish ones and aluminum ones?? I know you can get aluminum ones on mcmaster, but i haven't been able to find the rubberish ones..


I have a Northern Tool store here in town I get the plastic ones from. I got the aluminum ones from Mcmaster. You can also get camlocks from tractor and farm stores, not to mention our very own BC Arms here in Spudfiles.

The aluminum camlocks will probably hold up to a few millisecond exposure to 400 psi with no problem. I would be more worried about everything else connected to it.
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Unread postAuthor: JDP12 » Sun Apr 27, 2008 8:18 pm

haha yea..

i was looking at mcmaster.. and they have nonlocking and locking levers- i assume i'll want locking ones??
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Unread postAuthor: Velocity » Sun Apr 27, 2008 8:19 pm

starman wrote:I have some of those aluminum ones as well and plan on using them on a low "x" hybrid, 3-4x max. configuration I'm working on.


...sigh...

I remember the good old days, when any hybrid was to be feared. Now people do 6x and 7x like it was nothing.
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Unread postAuthor: starman » Sun Apr 27, 2008 8:19 pm

THUNDERLORD wrote:@ starman, that was cool!!!
I was hoping you would maybe see my reply and reply back.
(if not,that he could reference your post), and everything worked out.
As for this topic, looks like you are the expert too!!!
That was Great, Thankyou :wink:


Yes timing worked out well. Just happened to get on around that time...been on the road most of the day today.
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Unread postAuthor: starman » Sun Apr 27, 2008 8:25 pm

ilovetoblowthingsup wrote:haha yea..

i was looking at mcmaster.. and they have nonlocking and locking levers- i assume i'll want locking ones??


No you won't need the locking ones, unless you just want the extra expense.
I used this model 51415K15.

The one advantage of the locking levers is the rings won't rattle like the non-locking ones do.

If you want to build barrel ends with these things, you'll have to sand the ID of these down some to fit a 1.5" barrel OD. I use a drill press and a drum sander "bit" to do the job. A dremel tool will work too, it will just take longer.
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Last edited by starman on Sun Apr 27, 2008 10:00 pm, edited 2 times in total.
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Unread postAuthor: JDP12 » Sun Apr 27, 2008 8:28 pm

cool thanks- and i'll be using some smaller ones for smaller barrels- less than 1" diameter barrels but thanks for all of your other help, along with the burst disc tip- i can see that stuff working really good. i also have a big roll of aluminum foil i want to test out too...lol

EDIT: Also, i'm not worried about the fittings around them- all galvanized pipe nipples :D

EDIT: WOOT! 600th post! :wav: :blob2: :blob3: :blob4: :blob5: :blob6: :blob7: :blob8:
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Unread postAuthor: mark.f » Sun Apr 27, 2008 9:53 pm

Velocity wrote:...sigh...

I remember the good old days, when any hybrid was to be feared. Now people do 6x and 7x like it was nothing.


That was because, in the old days, most people made hybrids out of SCH-80 PVC, which I very damn well would keep under a 3x-4x mix! Most people now trust steel pipe to carry them safely past 5x mixes. Whether this train of thought is safe or not I am not currently disposed to say, but I will say that I'd feel a lot safer lighting off a 5x mix in a steel chamber than in a SCH-80 PVC chamber. (Although I'd still feel a lot better with seamless SCH-80 steel and hydraulic fittings {3K PSIG rating}).
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