Putting It All Together
Despite being done the machine work months ago, I only just now (grudgingly) assembled the light. The reason is pretty simple: once the driver is sealed up inside the host it's very difficult to change the firmware. I've spent many nights flashing and reflashing code changes at my computer desk trying to get things just perfect but there's no substitute for real-world use so it's time to say "good enough" and take this thing out on the road.
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We start with the MCPCB. Most of you already know what it is, but the
Metal
Core
Printed
Circuit
Board is what you mount the LED on. Sinkpad's are extremely expensive, solid copper MCPCB's that directly connect the LED thermal pad to the flashlight body. They're measurably the best MCPCB's on the market in terms of wicking away excess heat from the emitter into the body. They're also really thick and heavy - my little 10-pack weighs more than most of my lights.
These are pretty much impossible to solder with an iron so I applied a dab of solder paste to each pad, mounted the LED, and reflowed it on my skillet. For this prototype unit I've chosen a N219B HCRI LED.
After physically examining and poking the LED to make sure it was completely soldered, I tested it for functionality. If you set your multimeter to 'continuity test' it will ramp up the voltage until a small current flows - the perfect way to test an LED without blowing it away.
Next up: getting the driver mounted inside the driver pill. Here I've soldered some power wires onto my little boost converter (two to the battery, two to the LED).
The fit is perfect! The board is suspended neatly inside the driver pill, resting on a tiny ledge which contacts the ground ring on the driver and serves as both a ground and heatsinking path. The white Delrin collar is the one you saw earlier - it acts as an insulating spacer which will a) keep the battery contact PCB the correct distance from the converter and b) give a bit of room for the wires to fit.
Here I'm trimming the driver wires to the correct length. This is seriously hopeful wishing on my part: my goal is to be able to flip the contact board completely out of the way, allowing access to the microcontroller for reprogramming without completely disassembling the light. It might work, it might not, but I'm going to try. If it does, it'll mean flashing a new firmware is a 10-minute ordeal with no soldering and only a pair of tweezers needed for disassembly.
Hopefully all that extra wire will fit in the driver cavity! The solder points get some Kapton tape to prevent shorts.
These springs were marketed as 'carobronze' which is apparently a Phosphorus Bronze alloy. They have a higher tension than my old ones and seem to be very low resistance.
With all the soldering done it's time to try fitting everything into the driver pill. Fingers crossed - this is where we find out if my estimated dimensions match up to real-life.
Looks good.
A touch of Arctic Silver thermal paste and then we're mounting the LED up on top of the pill.
The Kapton tape is quite important up here because the metallicized reflector will conduct electricity and could cause a short.
A quick test-fire to make sure everything is working before we proceed.
These rubber switch boots are intended for use with short e-switches. To modify them for a McClicky the central pillar needs trimmed off.
Most McClicky's screw down into the body. Screwing them up into a tailcap (like in a Surefire 6P) is fine so long as the flashlight body contacts the silver ring on the bottom of the switch. In our case neither scenario is happening, so we need to add an additional component: a threaded retaining ring that grounds the switch against the body of the tailcap.
And with that, we're all done! As an added bonus, with our switch boot on one end and an o-ring on the other, this tailcap is almost certainly waterproof.
A tiny Delrin centering ring keeps the reflector centered on the LED. If you look down on a reflector and see the yellow phosphor of the LED you're on the path to a nicely focused beam.
Looking like the rocket from a Saturn V, the reflector sits atop the driver/emitter stack.
The reflector is slightly larger (18mm) than the glass window (17mm). I was having issues getting the o-ring and glass centered during assembly, so it was back out to the lathe for ANOTHER Delrin centering ring (you can see it sitting at the bottom of the head). The part count keeps risin' but if you want great results you have to work for them!
Now THAT'S a centered o-ring. The slight blue tinge is the anti-reflective coating of the ultra-clear lens (UCL).
The whole assembly is threaded down into the head...
... and we're finished!
Ah heck, I can't keep you in suspense. Shall we sneak a peek of the Spyglass v2 compared to the previous version?
In addition to the driver being completely redesigned from the ground up, we've changed a few external things as well:
- Driver pill has been changed to aluminum. Not only is it a great conductor of heat, it offers a nice contrasting color band around the head.
- Body on this light has been machined from bearing bronze, lending the red warmth of copper with the nice black tarnish of brass.
- Tailcap is now separate instead of integrated, greatly improving waterproofing.
You might have noticed one other difference: where's the pocket clip?! I've mentioned before that the previous clip was a pain to assemble and the attachment point really needed refined. For this revision I'm hoping to slip a pocket clip between the tail and body.
This was my first foray into the wild world of waterjet cutting. A local shop in town offered me a small run of prototype pieces, so I brought in my drawings and they went to work. This was the result: 10 pieces of 0.060" stainless steel.
The edges were a lot rougher than I expected. This is probably because most clips are stamped with a die, not sliced with a waterjet.
I wouldn't want to do any great number of them, but for a single prototype I was willing to go at the edges with a file.
There is a nice smooth edge hiding under there, just need some elbow grease to bring it out.
The surface finish could use some love as well. I started with some wet 600 grit and moved to 0000 steel wool. I brushed the steel-wool lengthwise to give a uniform appearance.
A little elbow grease later and we're left with a much nicer looking clip.
Adding the bends to this clip was MUCH easier than bending the old wire clip of the v1 light.
So? What does it look like?
I spent a good portion of the day comparing this clip to those on other lights I own.
If I had to rate the holding power and tension I'd probably say:
- Stronger grip than Surefire long clips (A2, E2) but less springy and more rigid.
- Weaker grip than McGizmo death-grip clip (I'm fine with this; McG's clips have shredded numerous pairs of pants, they're crazy tight). More flex.
- Stronger grip and more rigid than DarkSucks Eiger clip.
- Closest comparison is probably the Moodoo HDS clip, though the Moodoo clip is probably stainless spring-steel as it seems less likely to deform than this one.
So overall it's a good first go-around! I might tweak a couple things about the design (and possibly the material) but I've been carrying it for a week and it's performed admirably as-is. Do I like the aesthetic better than the v1 wire clip? Ehhh, I don't know I can say that yet. The v1 clip has a special place in my heart but it's not immediately feasible on this design. The new clip offers many benefits over the old: it can be changed or removed without tools, it doesn't compromise waterproofing, and I can cut all kinds of different designs and swap them out as I please.
I'll finish this post with a couple glamour-shots
devil
. Next update will cover the new driver and functionality so check back later will ya?
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