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Post by vance on Nov 2, 2017 17:01:48 GMT -8
I'm sure my fate will be worse than that, given my propensity to doing these unnatural things.
I can't help it. I'm considering the 50 Fathglscunark rev1 even now. WITH A DACOR HOSE LOOP.
I think I need help. When will it ever end!!?
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Post by vance on Nov 2, 2017 20:40:12 GMT -8
Phil, use a drill's chuck micro-lathe: I use mine to make lots of little parts, and polish out out high pressure seats JB Yup, a Dremel or a drill makes a good lathe. You can do lots of lathey things on a drill press. But, that's not the problem, really. It would still require making some sort of sleeve that is the same diameter as the thick base to put over the shaft to give sufficient clampiness and to hold the shaft true while applying sidewise pressure. Making a sleeve would be too much bother, unless it proves that the pin needs further work.
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Post by cnotthoff on Nov 3, 2017 8:33:31 GMT -8
Jay, Did you get the Snark III schematic I emailed to you? I still haven't tried a work-around for posting images here.
Good Dives, Charlie
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Post by nikeajax on Nov 3, 2017 8:42:34 GMT -8
Charlie, I did respond to you: I think it was Phil who needed the schematic, not me... He bought my Snark from me I think about a year ago?
JB
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Post by vance on Nov 5, 2017 16:29:42 GMT -8
Speaking of lathes, I'm currently experimenting with making an M10x1 to 3/8" UNF adapter to fit the Snark 3 overpressure port. It will be used for a safe second/BC inflator hose/IP pressure setting gauge. The first one will be an aluminum mock-up to get the machining right. Then, I'll make one out of brass hex stock. I'll use a 3/8ths tee to get 2 LP ports.
The alu one will be dedicated to the pressure gauge, later.
I now have 4 Snark IIIs. 2 blue labels, a black label, and a Silver. One of the blue labels will likely remain a parts donor, and its bottom can might become a permanent contribution to the Snarubastral rev1. I go back and forth on this, since the Mistral bottom can has a DBE, and I'll have to make an exhaust valve for the Snark can. But, making the snark valve out of sheet of silicone with an IBM PC standoff (of which I still have many) has a certain appeal...
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Post by SeaRat on Nov 5, 2017 18:47:55 GMT -8
Phil, just remember that the Snark III LP port is metric.
John
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Post by vance on Nov 5, 2017 18:57:33 GMT -8
Yes, it is a 10mm x 1 male to 3/8"x 24 female adapter. The male end screws into the op port and a 3/8" Tee for LP hoses screws into the female end. This will also allow me to use a standard IP gauge to set the intermediate pressure on the Snarks! It's kind of finicky machining to make the relief for the o-ring on the 3/8" side.
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Post by nikeajax on Nov 6, 2017 6:35:09 GMT -8
Geeze Phil, I think you like writing things that sounds like you're choking on the remnants of a sandwich way too much! As for the machining: these things wouldn't be nearly as much fun to people like you and me if we couldn't play Victor Frankenstein... Keep up the good work son.
JB
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Post by SeaRat on Nov 6, 2017 23:18:29 GMT -8
SeaBob,
Yes, that Overpressure relief valve is set that high, but this is about 2x the interstage pressure setting. This is an upstream valve, and so needs either an Overpressure relief valve, or a downstream second stage to act as an Overpressure relief valve in case of a first stage malfunction. But the Snark III has been used with this modification literally for decades now. Phil is not he first to make such an adapter.
John
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seabob
Senior Diver
Instructor Trainer evaluator through all OW and Tech
Posts: 59
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Post by seabob on Nov 7, 2017 4:40:16 GMT -8
John,
Thanks for the clarification. I understand using a downstream second stage in lieu of the op valve. Just wanted to make the point that is does need to be used as on o/p port. Wouldn't want the uniformed using it as a lp port for a BC or the like.
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Post by nikeajax on Nov 7, 2017 7:31:06 GMT -8
Ding-dang-it John, ya beat me to the punch! JB
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Post by SeaRat on Nov 7, 2017 8:21:23 GMT -8
John, Thanks for the clarification. I understand using a downstream second stage in lieu of the op valve. Just wanted to make the point that is does need to be used as on o/p port. Wouldn't want the uniformed using it as a lp port for a BC or the like. Normally what happens is that the LP port is split, and both a downstream octopus and an inflator are used off that port. But you are correct, it MUST have some sort of downstream octopus or the overpressure relief valve present to be safe. My Snark III has just the overpressure relief valve, and if I want to have an octopus, I use my twin tanks with two posts, and put another single hose regulator on the other post. John
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Post by vance on Nov 7, 2017 9:13:24 GMT -8
SeaBob, Yes, that Overpressure relief valve is set that high, but this is about 2x the interstage pressure setting. This is an upstream valve, and so needs either an Overpressure relief valve, or a downstream second stage to act as an Overpressure relief valve in case of a first stage malfunction. But the Snark III has been used with this modification literally for decades now. Phil is not he first to make such an adapter. John Right. The IP is set at about 110 on these regulators. The high setting is to vent under extreme pressure during a malfunction. The second stage will do this instead of the valve. Of course, an op valve can be installed in the "T" as well, but there's no point, unless you just want to run a BC inflator. Phil (choking on sandwich... )
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seabob
Senior Diver
Instructor Trainer evaluator through all OW and Tech
Posts: 59
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Post by seabob on Nov 7, 2017 13:26:16 GMT -8
They are like the old Poseidon's. IP goes up as tank pressure goes down.
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