I did a thing!

[William the Third]

So a while back a guy brought some stuff into the field to sell. Among that stuff was an ION that we really had no interest in. Well a deal was made, and the ION was thrown in for the hell of it. Anyway, the ION got put aside to salvage for parts, but the barrel for whatever reason got mistreated. We were throwing it around and just generally beating the crap out of it (mainly the thread side for whatever reason). At one point the threaded side ended up in a vice to see how much effort it would take to crush. Needless to say, the threads were totally borked, and we hacksawed off what remained of them.

Then I got the brilliant(?) idea to take it home, stick it on the lathe, and cut it for Cocker threads. Why? Just to see if I could. Though my Chinese 8x16 lathe can in theory be setup to single point threads, I not ready to try that yet, so I got a 15/16-20 die (I also got a tap, as I figured I could maybe use both in the future, however it took about a month for them to get here). Mind you, I am no machinist (the real machinist on the forum will be justifiably laughing at my results), nor do I aspire to be one. Hell, I didn't even stay in a Holiday Inn Express last night (I'm too poor for that, it was an Econo Lodge beside the strip club).

I grabbed the Cocker thread specs from ZDSPB, and started cutting on the barrel yesterday. I got it down to ~0.930, and the stopped to go help someone with their plumbing. Today I finished it up, cutting the non-threaded portions down to ~0.865. I decided I wanted more threads than the drawing, just because I wasn't sure how good my threads would end up, so I figured more would be better. After getting that done, it was time to cut the threads, and that's where things went a bit south. While cutting the threads the barrel slipped in the chuck. The threads were a pain to cut, in part due to the size (largest I've ever cut), and I feel like the die was pretty aggressive and didn't have a lot of taper before I started cutting threads at full depth (this wasn't actually the die I'd ordered, it was the correct 15/16-20, but everything else was wrong). Anyway, cosmetic damage aside, I got the project finished, and here is the final result.











Bonus points if you read the subject in Jeremy Clarkson's voice.

[DocsMachine]

Turn very shallow grooves where the jaw scoring is- make people think you meant it that way.

Doc.

[Trbo323]

Turn very shallow grooves where the jaw scoring is- make people think you meant it that way.

Doc.

Just continue the pattern down the barrel!

Also, if you are willing to do it, I've always wondered just how many threads you actually need on a cocker barrel. I'm sure we have all gotten tired of threading cocker barrels on, but if there are fewer threads let's say you only have to turn the barrel 2 full revolutions, is that enough?

That and interrupted threads. But for that one you would have to modify the marker as well.

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[DocsMachine]

Also, if you are willing to do it, I've always wondered just how many threads you actually need on a cocker barrel.

-I believe it was Simon from Inception, that measured a ton of barrels, and published a 'spec', since nothing official ever came out of WGP. And he "improved" it by reducing the number of threads to around half to a third of most others.

Really, since there's no real torque or force on the barrel, a turn and a half would hold it in place. Although it'd be much more likely to strip, or even just come loose.

I'd say you don't need more than four or five turns, max. I wouldn't go much less than that, though.

Doc.

[Frmrspec]

First one is always the scariest.. now you have it in your bag of tricks. If you plan on doing any more, a thread file will do wonders for cleaning up any nastiness left..... also if the die doesn't have a generous lead in, you could always machine a taper between the two diameters using the compound, then turn down the taper after threads are established.... many ways to skin a cat.

[shrompman420]

did he make you crawl under the house, we had plumbing 101 lessons yesterday!!

[markdem]

I struggle to use taps and dies on a lathe. You did a good job! Well done

[William the Third]

did he make you crawl under the house, we had plumbing 101 lessons yesterday!!

No, not this time. This time I was under the sink while he shoved his pipe through the glory hole from down below!

[Trbo323]

I'd say you don't need more than four or five turns, max. I wouldn't go much less than that, though.

Doc.

That's why I've always wanted to try interrupted threads. You could potentially have a barrel that threads on like a twist lock but it's still cocker threads. You would need to modify the marker and if you ever wanted to switch to a new barrel you could still use it since it would still thread on like any other cocker barrel

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[shrompman420]

No, not this time. This time I was under the sink while he shoved his pipe through the glory hole from down below!

yup that checks, carry on...classic plumbing joke

[*c-ro*]

Good work !

[William the Third]

I did more thing! Honestly, I just eyeballed this, so they aren't perfect.


I put it on this Sniper I just rebuilt, as the who owns it really liked the ION. So I thought it would be funny to send him a picture of his Sniper with an ION barrel.


Then I put it on this Meteor I installed a Lazarus valve in, and tried to convince owner that I cut his body to take Impulse/ION/Luxe threads. I was hoping to rile him up, but I don't think he bought it, as he just played along.

[markdem]

Cocker threads are pretty forgiving. Theres a lot of room to play with. Keep up the good work! Youll be machining all sorts of parts in no time!

[Trbo323]

Those are now your trademark "cooling fins"

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