GB: Copper C8 head for 25mm Khatod Quad optic, 24mm Carclo's

Square, same as V2.

V2 that I have has TRUNCATED TRIANGULAR threads. They might look square but they aren’t. Gotta look real close.

Besides the Convoy C8 body, what else do we need to complete the flashlight?

  • Driver (any recommendations?)
  • 4 x Emitters (recommendations forthcoming per the OP)
  • Retaining ring? (not sure if one is needed with your socket head cap screw system)

Driver: I’d go with a FET driver of some sort for some WOW turbo action. Choose a battery to pull the right amount of amps to whatever LED’s you choose.
Emitters: Cutter quad stars are going to be available from a few retailers soon with various LED’s on them, I’d imagine.

No retaining ring necessary with the socket head cap screw system.

I see that the final design may be undecided as of yet, but I’m very interested as well. I’ve got an older Convoy, the one with the removable pill, but I could buy a new host if needed. I’ve also got a couple of Thorfire C8s hosts if those may work.

The other idea being discussed here seems to be a solid copper full host modeled after (or at least similar to) the Convoy S2. I’d be all over that, especially if the tailcap could be machined to accept the metal switch from a real S2.

So I guess what I’m saying is put me down for one each :slight_smile:

We can`t understand each other one more time. Simply:

  1. Standart thread making operation calls lathering (not milling)
  2. Most hosts have metric thread pitch.
  3. Metric thread have a standart shape with 60-degrees top (and same cutter shape)
  4. TRUNCATED TRIANGULAR threads is standart 60-degrees threads with cutted tops.
    A year ago I have sold few C8 V2 pills and I named them “with trapezoidal threads”. Why so? It is too hard to make such threads with standart 60-degreed thread-cutter on lathe, so it is nessecary to make/use special cutter with trapezoidal shape.

When BLF-members make their reviews, they always call threads that have trapezoidal shape “square threads”.

Yes there are a couple of standard pipes that fit our cells
No worries about threads in existing models
Tale the closest to fit 26550 cells

People can ask for specific lengths
Design a head like the C8 but fitting that pipe
Though a little more then I like to spent I’d buy one just for the sheer awesomeness.

Now I do not know if it would fit my Convoys and still i d be left with a perfectly fine C8 head. So even after opening this thread a couple of times to say yes incamt justify it.

By the way, have you thought about PVD-coating? You like good looking things, how would external parts look after a year?

As far as I know there are two styles of thread on the Convoy C8. A really old version with triangular threads and a newer one with truncated triangular threads. If there’s also a square thread version I’ll scrap the C8 head concept entirely.

As for making a whole light, if I made all of the parts S2+ compatible, the parts could be purchased individually, which some might consider a benefit. If the body were made from tube it would be out of a different alloy of copper than the rest of the parts, but no big deal. The ID of the tube would be .75” which is about .02” [.5mm] larger than the stock S2+, but also no big deal. A stock C8 has a .740” ID so it’s close.

PVD coating is insanely expensive, but black chrome is a good option, and also Cerakote. My experiences with plating companies are always mixed.

Just one guy’s opinion over here, but I’m a lot less interested if its PVD coated. I want real copper and I want to feel it with my hands, not hide it under a coating.

I’ve got a Cerakote light. Its not nearly as scratch-resistant as a good type-3 ano. And again I wouldn’t want something coated over all that beautiful copper underneath.

Nah, PVD is not an option. Black chrome is an option, and is what they put on Lamborghini rims and stuff. It looks great. Brown oxidized copper ain’t all that pretty in comparison and it makes your hands smell funny.

I added a simple CAD rendering to the OP.

The rendering looks amazing! I can imagine it on a C8 body already :laughing:

I’ll try to get some macro shots of my C8 V3 when I get home so it can be determined if they’re square or truncated triangular. IIRC they are not 100% square, I have a V3 from last year and another one ordered just recently, the parts are interchangeable but the finish of the newer one is less matte.

I don’t. I describe them as triangular, trapezoidal, and square just based on their shape and being a layman when it comes to machining; I don’t recall seeing anything other than those three on flashlights.

Also, sorry for any confusion above. I always think back to my 3 year old Convoy XML C8 (presumably V1?) as having triangular threads; however, as I just checked and they are actually trapezoidal on the battery tube.

The “ThorFire C8s” both removeable pill and integrated shelf version have square threads. I believe they have yet another version of the C8, the “ThorFire C8” I don’t know anything about it apart from it having a removeable pill.

Trapezoidal threads, which have a 29° included angle for acme, 30° for metric, are easily confused with square threads so that’s understandable. Most square threads are actually the “modified square” profile which has a 5° angle per side, 10° included, like those on the Thorfire C8S.

A lot of folks call the truncated triangular threads square also which I tend to call out when I see it. :wink: Triangular threads have a 60° included angle.

I do not currently have the capability to cut square threads, but I can cut trapezoidal (acme) threads.

I’m in.

I’m at home, so here’s a photo of the threads on my Convoy C8. Mine’s a bit older, has the removable pill instead of the shelf. Its worth noting that parts to this light are interchangeable with a Thorfire C8s that I also have.

I’m not a machinist, but I’m pretty sure these are the trapezoidal threads you’re all talking about, yes? If its not the same threads as the latest lights then I’ll buy a new one. Not a big deal.

I think you should just go with the latest Convoy C8. The C8 is the better type of light for this cool, one of a kind head. There are so many different models out there, you have to decide on one. I have an older model, but I’ll order an new version just for this custom head… Convoy hosts are pretty inexpensive.

Awesome thanks emarkd. Those are truncated triangular threads. 60° included angle.

I agree. If the current model had square threads I simply could not make it however.

Oh wait… That’s not a V3?…