Greetings to all!
Blimey, it's been a while. 2018 wasn't the most fantastic year so many things were shelved, delayed and ignored but work does continue (albeit very slowly) and I thought I'd share some success with you.
Cast your mind back to the pump placement issues (or go have a read if you're new here - welcome
). I'm very happy to say a significant step has been made in resolving it: the DDC is finally in!
After all the toing and froing regarding measurements and poor accuracy, I confirmed that the distance from the edge of the GTX Titan and the glass side panel gave me an operating width of 43mm. DDC heatsink bodies are on average 20mm tall and my choice of pump top is a further 20mm. Factor in some manufacturing tolerance and the combined pump+top is 42mm tall. What that doesn't factor in though are the fins on the bottom of the DDC heatsink, which add 5mm, and DDC tops traditionally are fed from the top. All in and we're too big to fit. I've already discussed modding the Aquacomputer DDC top to have a side feed and using a custom stainless steel plate to seal off the top feed, so that keeps the top down to 20mm, but it was the heatsink that was the major issue.
The first plan was to just chop the fins off my Alphacool heatsink. Because Alphacool use a very thin thermal pad, removing the fins would reduce the heatsink to 19mm. Nice, but then put 1.5mm back on for my mounting bracket and we're up to the limit again. Plus, I didn't fancy the idea of getting nickel everywhere from cutting and filing, and I know I'd just want to strip it down and replate to keep things tidy. Same deal with the EK heatsink; easy enough to strip the anodising off the aluminium, but then it would need recolouring. But then I noticed Barrow take a slightly different approach.
Barrow's heatsinks are actually in 2 parts: a chunky piece of aluminium which does the actual heatsinking and a thin body ring. Could I combine then the actual heatsink portion and mounting bracket? That would save a lot of space. So I grabbed one and redesigned my mount. Believe it or not I actually cut this by hand!
Scruffy? Yes. But I'm stoked to get the end result that good with just a step drill, coping saw and a crap wrist
Quick assembly to ensure my mounting holes are correct...
...and then fold that bottom tab into place.
Nice job, but does it actually work?
So far so good, but there's supposed to be a computer in there...
Hot damn that's tight, but it's not actually touching the Titan. Major win (and relief) #1
Now, in a perfect world the entire pump assembly would fit within that 43mm operating space so I can put the side panels back on with no further mods, but if need be I can put in a 1mm spacer to just edge the panels out without issue. Do I need to?
Maybe. The pump mount is almost flush with the case tabs that hold the side panel mounts. If the mount
is flush then the glass will press on the pump and we'll get vibration and noise. But 1mm in this build is acres of space so I'm not too concerned right now.
Now at this point I'm still just test fitting for viability. As a result I'm using standard dome head M4 screws to bolt everything together. The head height for those screws though is 2.3mm so of course they're not going to work. But the plan is to use countersink screws and get them flush with the mount.
Golden! Major win (and relief) #2
What I've not shown you here is a small failure. I'm using 1.5mm aluminium and the countersink M4 head is 2.3-2.5mm, so I wasn't sure if I could just slap a countersink into the mounting bracket given I'm missing almost 1mm of material to cut into. The idea at this point was to JB Weld spacers to the inside surface and give me more material to form the countersink. These spacers would also serve as proper alignment feet for the Barrow heatsink ring given it's just 8mm through holes and slides around the screws as you tighten up.
The Mod Gods were merciful and I found some perfect spacers: M4 tight through holes (4.1mm) and 8mm diameter. Perfection
Nickel-plated brass though, but they won't be visible so didn't matter if paint didn't take, but a quick rasping on the mating surface got rid of the nickel there ready for the JB Weld. The JB Weld didn't take though as a 2mm ring just wasn't enough surface to adhere to
and take the pressure of grinding down a countersink cone. Plus it was possibly the hardest form of brass in the universe. So the spacers popped off, but wonderfully the countersink in the aluminium took perfectly without deforming! Nice bit of luck there.
For now I've slid the spacers inside the barrow body ring so they can still serve as alignment holes, but for the build proper I'm going to drop in some 16mm long nylon spacers to fill the gap from the pump top's alignment feet and the mount, hopefully providing a bit of support so I don't warp the countersinks as the entire assembly is tightened.
So moment of truth then. Does the glass panel actually fit back on?
Oh yeah
Glass side panel perfectly screwed in. I can actually give the pump a push from the other side of the case and it doesn't knock against the glass. Major win #3
Speaking of the glass panels, I never actually told you about them either. Stay tuned...