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Post by vance on Dec 5, 2021 18:57:59 GMT -8
I made an LP port adapter for James the other day, and decided to make a couple more. I don't have any Snarks left, except the 250ft Snark, so it was mostly an exercise in design and machining practice. You must figure out and follow a sequence of steps or you'll end up not being able to hold the piece in a chuck or keep things concentric. I got a couple of collet chuck blocks for the mill that I wanted to try out. One is a square, and the other is a hex. These allow you to clamp the work in the chuck end, using various size collets. When mounted in the mill vise, you can cut one, two, three, or four sides of the piece by rotating the square block in the vise. If you hold it in the vise by the corners you can get up to eight sides! Same for the hex block, but up to twelve. For the Snark adapter, I cut two wrench flats on the ends, using the square block. Perfect! You only need to set the mill depth and width of cut once, and every cut is identical. That is the 250ft Snark with one installed, and another inverted to show the spring side. BTW, the original Snark adapter did not have a second stage spring seat like this. It was drilled through with a large bit. Oddly, the spring was held in place by the LP hose end. You had to be careful when removing the hose so you didn't lose the spring when it fell out! I'll probably make a couple more just to perfect the procedure.
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Post by snark3 on Dec 6, 2021 10:47:17 GMT -8
I made an LP port adapter for James the other day, and decided to make a couple more. I don't have any Snarks left, except the 250ft Snark, so it was mostly an exercise in design and machining practice. You must figure out and follow a sequence of steps or you'll end up not being able to hold the piece in a chuck or keep things concentric. I got a couple of collet chuck blocks for the mill that I wanted to try out. One is a square, and the other is a hex. These allow you to clamp the work in the chuck end, using various size collets. When mounted in the mill vise, you can cut one, two, three, or four sides of the piece by rotating the square block in the vise. If you hold it in the vise by the corners you can get up to eight sides! Same for the hex block, but up to twelve. For the Snark adapter, I cut two wrench flats on the ends, using the square block. Perfect! You only need to set the mill depth and width of cut once, and every cut is identical. That is the 250ft Snark with one installed, and another inverted to show the spring side. BTW, the original Snark adapter did not have a second stage spring seat like this. It was drilled through with a large bit. Oddly, the spring was held in place by the LP hose end. You had to be careful when removing the hose so you didn't lose the spring when it fell out! I'll probably make a couple more just to perfect the procedure. Phil if you make extras to perfect the process I know someone who has many many Snark 3's and would be willing to buy any extras from you.
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Post by vance on Dec 6, 2021 11:06:49 GMT -8
I sent one to James the other day, and it won't fit his Snark. Too big. (Edit: it actually does fit, but tight.) It fits the 250ft Snark perfectly, so I guess I got the tolerance a bit too tight for universal fit. I was working on that, b/c I felt my others were a bit loose.
In case you don't understand why you can make a threaded part that doesn't fit, I'm not using dies. (BTW, dies can be adjustable, as well...)) I'm single point threading a boss (OD) on the lathe. The starting od can be whatever you want. Then, you cut threads on that boss. If the od is too big/small, it won't fit.
He's sending me a plug to measure. I can't find the one that goes in the 250fter. Probably sent it to Skip with the rest of the Snark stuff.
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Post by james1979 on Dec 6, 2021 11:17:51 GMT -8
I sent one to James the other day, and it won't fit his Snark. Too big. It fits the 250ft Snark perfectly, so I guess I got the tolerance a bit too tight for universal fit. I was working on that, b/c I felt my others were a bit loose. He's sending me a plug to measure. I can't find the one that goes in the 250fter. Probably sent it to Skip with the rest of the Snark stuff. Update on that... It fits, just snug (read as: wrench required). However, it is still on the way back to you with my plug (see email for details).... plus extras! Best, James
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Post by snark3 on Dec 6, 2021 13:11:08 GMT -8
I sent one to James the other day, and it won't fit his Snark. Too big. It fits the 250ft Snark perfectly, so I guess I got the tolerance a bit too tight for universal fit. I was working on that, b/c I felt my others were a bit loose. He's sending me a plug to measure. I can't find the one that goes in the 250fter. Probably sent it to Skip with the rest of the Snark stuff. Phil you sent me one a while back, but not with the other Snark stuff.
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Post by vance on Dec 6, 2021 18:30:29 GMT -8
I sent one to James the other day, and it won't fit his Snark. Too big. It fits the 250ft Snark perfectly, so I guess I got the tolerance a bit too tight for universal fit. I was working on that, b/c I felt my others were a bit loose. He's sending me a plug to measure. I can't find the one that goes in the 250fter. Probably sent it to Skip with the rest of the Snark stuff. Update on that... It fits, just snug (read as: wrench required). However, it is still on the way back to you with my plug (see email for details).... plus extras! Best, James Cool. If I take the adapter down to .695 or so it oughta work fine. No leaky!
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Post by vance on Dec 6, 2021 18:34:36 GMT -8
I sent one to James the other day, and it won't fit his Snark. Too big. It fits the 250ft Snark perfectly, so I guess I got the tolerance a bit too tight for universal fit. I was working on that, b/c I felt my others were a bit loose. He's sending me a plug to measure. I can't find the one that goes in the 250fter. Probably sent it to Skip with the rest of the Snark stuff. Phil you sent me one a while back, but not with the other Snark stuff. No prob, Skip. I don't need a stock plug except to measure it, and James is sending me one. I'll document the measurements this time. D'oh!
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Post by Fibonacci on Sept 26, 2023 17:00:08 GMT -8
OK I took the plunge and 3D modelled the OEM Snark accessory LP adaptor. Got a small run CNC machined and gloss electroless Nickel plated to ensure build up on the threads was consistent and could be allowed for in the tolerance specification. Just be be sure and eliminate one variable (given the tolerance issues outlined by vance above) every part was checked against a M18x1.0mm ring and SAE-3 ORB plug 3/8"x24 UNF Go/No Go gauge by the supplier before shipping. Currently in transit, due tomorrow according to the tracker. Due to a little higher plating cost and the additional inspection charges, the final price is US$25 each plus shipping... will check Australia Post rates to US, UK, EU and report back. Limited number available, please let me know if interested? Nemrod Snark adaptor 4 by fibonacci101, on Flickr Nemrod Adaptor Test Go No Go check Web by fibonacci101, on Flickr
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Post by Fibonacci on Sept 27, 2023 15:58:39 GMT -8
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Post by nikeajax on Sept 27, 2023 16:13:52 GMT -8
Dang bruddah! The lighting on your images makes them look unreal Sounds like you had fun geeking out with having these parts designed and made JB
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Post by Fibonacci on Sept 27, 2023 16:35:19 GMT -8
Pretty happy with the quality... It was a bit of a challenge to work with both suppliers and sort out the correct CNC machining tolerance to specify in my drawing for subsequent electroless nickel plating to fall within Go/No Go limits of Metric and Imperial threads but we got there! Nemrod Snark adaptor 9 by fibonacci101, on Flickr
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Post by Fibonacci on Sept 28, 2023 14:02:16 GMT -8
OK spent some time on the Australia Post website, seems they have recently jacked up their prices and reduced some services on overseas mail! I think I have a work-around, but will need to take samples into the Post Office and confirm. Thank you for your patience...
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Post by vance on Sept 29, 2023 6:46:57 GMT -8
Those look very good. The 3/8" through hole makes it shorter than the ones I made. I don't see what captures the spring when the hose is removed, but it's a good feature!
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Post by Fibonacci on Sept 29, 2023 14:38:07 GMT -8
Morning vance … firstly let me state it was not my intention to ‘cut your grass’ as I know you’ve been making your own version of these for a while! These are a close copy of the original Nemrod accessory, that I finally got an example of. A few people here in Australia wanted some. a few more on SB and it sort of grew from there. As you also found out, in the days before very accurate CNC machining Nemrod's tolerances were sometimes quite broad! The spring is retained by a small step, but the spring diameter also varies a bit.
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Post by vance on Sept 29, 2023 15:11:31 GMT -8
You are not stepping on my toes! I applaud any effort to produce parts for vintage regulators.
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