Ed Nisley's Blog: Shop notes, electronics, firmware, machinery, 3D printing, laser cuttery, and curiosities. Contents: 100% human thinking, 0% AI slop.
I recently replaced the hack-o-matic icemaker + fountain pump cooler with a LightObject Q600 water chiller, an entirely uneventful process. The Q600 has a back panel “aviation connector” with an alarm output for water flow (more precisely, lack thereof) or over / under temperature: pins 1 and 3 are closed during normal conditions and open during alarms (and when the power is off).
I finally wired the chiller into the OMTech 60 W laser’s internal water flow switch circuit, so that should either flow sensor have a problem with the water or the chiller detects an out of bounds temperature, the laser won’t fire.
You may recall the laser’s HV power supply arrived with its Water Protect input jumpered to ground, which I then wired to the lid interlock switch to (presumably) reduce the likelihood the replacement power supply will fail hot. The laser’s water flow switch goes to the Ruida controller’s WP input, where it behaves as it should.
Pin 2 of the chiller’s alarm connector is not connected to anything, so I added a safety ground wire for no good reason:
Laser Water Chiller – safety ground wire
The dent in the evaporator tube (upper left) is worrisome.
While I had the side panel off, I jammed a strip of closed-cell foam around the base of the compressor to silence a truly spectacular rattle:
Laser Water Chiller – compressor vibration suppression
I think the three mounting screws (yes, of these two: one up, one down, for no reason I can see) are looser than they should be, but I’m reluctant to tip the whole thing over with a tank full of water to get at the nuts / bolt heads on the bottom.
The connectors have a twist-lock notch that you must release after removing the screw (on the far side) holding the shell to the body:
Laser Water Chiller – connector shell keyway
I repurposed a USB cable from the Big Box o’ Cables, wrapped with enough silicone tape to fill the cable clamp:
Laser Water Chiller – connector closeout
In retrospect, I should have paired the red + green and black + white wires, but nobody will ever notice. The drain wire carries the safety ground from pin 2 to the shielding, not that it matters. Both ends of the cable have identical connectors.
The laser cabinet has a convenient hole, albeit just a bit larger than required, which now has a simple adapter plate with the proper flats:
Laser Chiller Alarm Connector Plate
The blue ring is the same size as the hole, so as to ease lining it up, and the red perimeter surrounds the connector with strips of good double-sided foam tape for maximum sticktivity. Done in clear acrylic from the scrap pile, the platform’s internal lights give it that subtle blue-white hi-tech glow:
Laser Water Chiller – laser connector installed
The doubled-up cable ties on the water hose barb connectors are a Good Idea™ due to the somewhat higher pressure of the chiller’s water pump. The bottom of that recess had traces of water on it and, of course, having a hose pop off its barb is a Bad Thing™.
The new connector is wired in series with the internal flow switch, using a trio of grossly overqualified silicone-filled splices:
Laser Water Chiller – laser flow switch splices
I did not connect the safety ground from the chiller to the laser’s frame, because they do not share a common breaker circuit and I have better things to do than chase ground loops.
For whatever it’s worth, the gray cable that came with the laser might also be a repurposed USB cable, too: it has two fat wires and two thin wires, although it’s not wearing USB livery.
The laser is happy when the chiller is running and unhappy when it’s off, so life is good.
Chipmunks zip into drain pipes when they detect even a slight threat:
Chipmunk peering from drainpipe
When I installed the drain pipes for the gutters & retaining wall along the driveway, I added a grate plug to keep critters from setting up housekeeping in what must look like an extensive cave network, although later experience showed I must clean debris out of the plug more frequently than I expected:
Driveway drain – fountain
I didn’t glue the PVC pipes together, because I knew they’d need adjusting, so it was no surprise when the last section of pipe shifted enough to open a small gap, probably because my lawnmowing passes always proceed from right to left over the pipe:
Chipmunk Refuge – shifted drain pipe
The front yard chipmunk immediately claimed the pipe and zipped into the opening whenever we met on my way to the mailbox.
When I reconnected the pipe, the chipmunk knew something had gone wrong and started some exploratory excavation in about the right spot to find the missing tunnel entrance:
Chipmunk Refuge – missing gap
Not being one to rebuff the humble, I decided to make the world better:
Chipmunk Refuge – site overview
It’s a short section of PVC pipe with a wood plug in the far end to keep what I grandly call “our lawn” from filling it up. I bandsawed a disk from a scrap of inch-thick lumber that used to be a door and introduced it to Ms Belt Sander often enough to make it a snug push fit in the pipe.
Some decoration seemed in order:
Chipmunk Refuge – decorated end plug
Which gives the place a nice, homey look:
Chipmunk Refuge – installed
Now, we’ll see whether the critters enjoy it as much as I did.
A chance encounter in the acrylic scrap box led to a radioactive einstein:
SCP Earrings – Radioactive einstein
That was so easy it’s gotta be either criminal or sinful.
A few test on scrap acrylic while tweaking the SCP warning label geometry showed only a few work well at such a small scale:
SCP Earrings – einsteins
The mirror in the lower right got cut from the back side, making it the mmmm mirror image of the others.
IMO these would look and cut better in 1.5 mm acrylic, but it seems edge-lit acrylic only comes in 3 mm sheets.
They are absurdly fragile across the waist, but my admittedly limited exposure to fine jewelry suggests durability ranks low in the selection checklist.
The alert reader will note two missing holes due to an unfortunate oversight while rearranging the layout. One can adroitly fix such errors if the cut shapes don’t move, which is how it worked out:
SCP Earrings – Trolase
With the obverse done, another fixture aligns them for a branding pass on the reverse:
SCP Earrings – Trolase – branding
This is starting to make sense in a peculiar sort of way …
I particularly like the Cognitohazard and Autonomous Object symbols. The Nonstandard Spacetime symbol comes in dead last; if you make one, use very little kerf offset.
Come to find out yellow is utterly unforgiving of smudges / smoke stains; orange is better, albeit non-canon. I cut them face-up through a layer of blue masking tape, which worked surprisingly well, except for a few areas where I didn’t apply enough paint: the chipboard fibers became one with the tape.
The cork disks arrive pre-cut with a PSA sheet, so using a jig for better alignment with the assembled chipboard layer would be a Good Idea™. These were assembled by feel, which is good for about half a millimeter.
A better process: cut an array of the shapes from a large yellow sheet, fit the black inlays from the back, stick the whole affair to a large cork sheet, then cut the circular outlines where small misalignments wouldn’t matter.
In production, it would make more sense to cut all the pieces from blank white chipboard, paint them in groups, then assemble everything.
Best: having me realize nobody else wants coasters.
A white pickup from a local landscaping company pulled onto Raymond Avenue well ahead of me:
Pickup Truck Drill Drop – A
Although it’s not obvious to you, something seemed wrong as it pulled away:
Pickup Truck Drill Drop – B
A closer look:
Pickup Truck Drill Drop – B – detail
The dark blob turned out to be a carrying case for an industrial-strength drill:
Pickup Truck Drill Drop – C
Fortunately, there was no oncoming traffic and the drivers could all swerve around the debris:
Pickup Truck Drill Drop – D
I was hauling a trailer of groceries and didn’t want to stop, but hailed the driver where he pulled over just past the Hooker Avenue intersection. Unfortunately, he didn’t notice the drill was missing and proceeded on his way.
When I got home, I called the company to tell them what happened. I hope they got someone there before the circling vultures landed …
The Smell of Molten Projects in the Morning 