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LSP Fountain

Clementine Mission Lunar South Pole Region - Blog Header
LSP4

This is a record of the design and creation of the Lunar South Pole Fountain project.

  • Side Project
    I recently had a request form someone who had seen my work at the Valley Artisans Co-op. She wanted a book stand. By co-incidence, Jayne had expressed interest in one as well. The one on the right is Jayne’s, the other for the inquirer, if she likes it. This project took far longer than it should have, partly because I used wood from the leftovers bin. The verticals are inset in the cross-shelf by about 2 mm. I used epoxy because of the small bearing area. In the left one I also added reinforcement corners underneath. Both stands are more … Continue reading “Side Project”
  • Top flattened
    Whenever I’ve done a flattening run on anything, whether a spoilboard or work piece, there have been low ridges. I finally made a CBE tramming device out of dowel and length of stiff wire. It bounces, but is good enough for my purposes. I got the Y axis set very close, but the X axis isn’t really adjustable. Even so, today’s flattening passes on the fountain base have ridges that are barely noticeable to the finger. They show up visually, but that’s due to the wood fibres. Given that this is end grain, I’m satisfied. The base is now 105 … Continue reading “Top flattened”
  • Underside machined
    That was certainly messy! I started with the Shop Vac attached to the dust boot. However, since I was using my longest straight bit, the boot was all but useless. Then I attached the dust system hose and used the Shop Vac to keep the work area from getting too filled with chips. The total cut time was over 3 hours. I had to stop the machine path for the copper pipes. For some reason I had specified them as 12.5 mm. After updating the tool path for 16.5 mm I re-ran it as the last tool path on the … Continue reading “Underside machined”
  • Base is back
    Mitch and Liana dropped off the potted base this morning. Now the long, detailed CNC work can begin. But first I sanded the perimeter clean and glued on sacrificial hold-down blocks. Once the glue is fully set I’ll drill hold-down holes. The bottom is fairly level but I will still run a flattening pass. The top is less flat, so I shimmed the gaps all around. The order of operations will be flatten and machine the bottom cavities first. This shouldn’t take more than a few hours of machine time and is not dimension sensitive for the most part.
  • LED Sections Work
    Well that had its’ frustrating moments. Some of the wire contact pads tore out, so I had to solder in bypass wires. Then half way through I realized that I didn’t need a return line for power and ground from the tops, I could just home run all the power connections. So the wiring is a combination of daisy chain and home run. Only the data line is consistently daisy chained, as it must be to work, and to produce a fully sequential pattern. Next I have to epoxy everything together and ensure that the top transition from copper to … Continue reading “LED Sections Work”
  • First LED section works
    Soldering the wires onto the tiny contact patches on the ribbons turned out to be far less frustrating than other times I’ve done it. The key is to scrape all the silicone off the contact area with a machinist’s file until the copper is glossy, tin the pad, then apply the pre-tinned wire. It was trickier getting the shortest ribbon wrapped evenly around the shortest tube section. I also managed to reverse the ribbon sequence, from end to beginning, but as long as I’m consistent it’ll work. There’s a blank area at the top of this one because of the … Continue reading “First LED section works”
  • Tops Epoxied
    I think I have the sequence of operations figured out. Today I epoxied the top caps in place and coated them with epoxy. For this I used System 5 epoxy, since a 5 minute setting time was fine. It just meant wasting quite a bit, with a separate batch for each cap. I didn’t have disposable brushes so I used the folded corner of a bit of paper towel. Half way though I though to heat the part after spreading the epoxy, thus lowering the viscosity and making for a smoother surface. You can see the epoxy coating on the … Continue reading “Tops Epoxied”
  • Tubes in Tubes
    Using a crappy old pipe cutter is a good way of wasting expensive copper pipe. I found one in a box of plumbing supplies from my father. As long as I maintained significant sideways pressure during the first couple of rotations, it tracks true. Otherwise it travels a spiral. With only about 20cm of waste, I got the pipes I need. I’m guessing a bit on the exposed extension that will work, based on space available but with no idea about how I’ll run the pipes back to the manifold. In any case, the pipes within pipes are ready for … Continue reading “Tubes in Tubes”
  • New Spiders
    I’m sure I’ll eventually find a use for the larger spiders. They might make nice wheels on a toy. The new ones fit the inside diameter perfectly. I had to sand the central holes a bit because apparently copper pipe isn’t exactly round. The epoxy filled base delivery has been delayed a bit, so in the interim I’ll keep working on the pipes. I have the LED ribbon so tomorrow’s project will be to cut that into the 7 sections and start wrapping it around the pipes.
  • Light Tubes & Caps
    The base is with https://nine45.ca for filling with Epoxy. I should have it back in a few days. In the interim, I’ve been working on other projects from my list. The first was to build a set of “Kitchissippi” chairs. I had purchased the Easter White Cedar late last year, and it’s been stickered and acclimating since then. I’m building 4 chairs for the shop, so it took a while to make all the parts. They are all ready for staining once I can do it outside. The past couple of days I’ve been working ahead on the light and … Continue reading “Light Tubes & Caps”
  • Base ready for filling
    Trimming the middle plug on the bandsaw didn’t take long once I had marked the limits. Once the glue was set on the middle, cutting off the extra joint sections didn’t take long either. Sanding the extra bits took about the same time, under 10 minutes. Now it’s ready for Nine45 to take it away and flood it with epoxy.
  • Birthday!
    Today is the anniversary of my 49th birthday. I spent it happily in the workshop. The Wainlux laser engraver I had supported on Kickstarter last summer arrived this morning. It’s been delayed for various reasons, not least because the developers overshot their Kickstarter goal by over 100x. After loading the driver and software I ran 3 tests. They all worked fine without issues. The goal for the day had been to glue up the centre plug for the fountain base. That’s done too.
  • Base Partly Assembled
    Today was productive – I got more done than anticipated. After lightly sanding the flash off the wall segments I did a trial assembly. The fit is quite loose, so assembly was no problem at all. Then I applied a strap clamp to judge the size and fit. It was fine. Diameter is now 565 mm, almost exactly what I had planned. Then I applied glue to the interfacing joints and clamped the assembly for several hours. While the glue was setting I realised that the first pass pieces could be trimmed to use as infill. I set my mitre … Continue reading “Base Partly Assembled”
  • Second Wall Set Done
    Another 3 or so hours of machine time and a bit of trial and error at the start, and the tenons of the wall segments are done. The first try, on the previous test piece, showed I again had the Y axis set incorrectly. I also increased the cut depth a bit. From there on, everything went smoothly.
  • Second Wall Set Started
    After some fiddling and adjusting, I created 11 good wall sections. The first one turned into a test piece, since I got the Y and Z axis alignments wrong. So I had to cut another section from the board, the lower one in the second photo. Then it was just a matter of standing with the dust system hose in place to reduce the chip mess. Each section took about 15 minutes. Tomorrow I’ll do the tenon side. I expect there’s be a bit of adjustment on the first one of those as well.
  • Bits are in!
    Yesterday the 2 long half-inch cutter bits arrived. Today I worked on the machining fixture. I had already added a reinforcing platform to the front. Today I machined it to height to accommodate the 16.3636 degree slope required. Then I carefully aligned the fixture on the CNC spoil board so that the X axis is as exactly inline as possible. The compression clamp on the right will ensure that the left of the workpiece is properly registered. I run 2 screws in from the left to be sure.
  • Well that didn’t exactly work
    Something was off. I did manage to get the ring sections joined with the help of a strap clam and a big rubber mallet. But they didn’t want to close up, so I left everything clamped to the table and called it a day. It was New Year’s Eve so to time to go “celebrate”. I opened what I believe to be a 20 year old bottle of Mumm’s Champagne. It wasn’t very good and the remaining half will be dumped. Today I looked carefully at the parts and the jig. Some sections had broken off the parts. As far … Continue reading “Well that didn’t exactly work”
  • Wall pieces
    Each section takes about a half hour on the CNC. Today I had a shorter day, being Wednesday with noon commitments. I stopped at 15:30 when 6 were done. I’ll do the other 5 tomorrow and do a a test assembly. So far nothing broke and there were no injuries.
  • Successful Joints
    Every pass gave additional feedback for further adjustments. First it was clearance, then positioning, then depth of cut. The -0.375 mm clearance works well. The tenons still protrude because the flattening cut is of course at half the included angle. I decided just to skip the flattening pass and trim the extra with the band saw or plane before sanding. The other consequence of the adjustments is that the usable section length is shorter than my original plan. That just means that the fountain diameter will be less than planned by about 100 mm.
  • Clearance tests
    4 test cuts later, and I have a joint that works. I started with a -0.125 mm clearance on the mortice, moved to -0.250, then tried -0.5 mm. The last works, but is now a bit loose. I’ll try again tomorrow with -0.375. I also completely redesigned the joint. The other one was adapted from my Raven Desk joints, which were cut with a 1/4″ cutter. This time I have to use a half inch cutter because of the depth of cut. This latest joint is based on circles with a 15 mm diameter, assuring lots of clearance for the … Continue reading “Clearance tests”
  • First Test Cut
    First test of the fixture is a partial success. Nothing broke. No-one was injured. The joints don’t mate. I left the -0.125 mm allowance that has worked well in the past. I’m thinking I didn’t rotate or reflect the joint design correctly. Since this is my first asymmetrical joint, that’s probably the reason. The other good news is that the angle is exactly correct, within measurement error. Man, it sure was nerve-wracking though. I don’t like long bits or deep cuts. I reduced the feed rate to 40 IPM with a 6 mm pass depth, so it was fine. But … Continue reading “First Test Cut”
  • Pieces ready
    The machining fixture is ready and fits the side pieces perfectly. The pieces for the side are clean and cut to size, ready for machining.
  • Creating the Wall
    After thinking about this for several days and partial nights, I realized that adding fancy joints to the perimeter wall would add a lot of interest. The problem is that the joints will have to be at an odd angle, that angle dependent on the number of sides. I decided not at all arbitrarily to make 11 sides. I’ll leave the reason “as an exercise for the student”. In any case, I laid out a design for a machining fixture in VCarve and made it out of 18mm Baltic Birch. Now I just need clamps to hold down the work … Continue reading “Creating the Wall”
  • Raw Materials
    I started with a composite image courtesy of the NASA Lunar Reconnaissance Orbiter, used a Fusion 360 plug-in to turn it into an STL file, then imported the STL into Vectric VCarve Pro. From there I was able to generate the tool paths for the CNC. The test piece is made of MDF. The white cylinders are a place-holder for the 7 that will eventually form a fountain. With the recent confirmation of water on the Moon, I think this is a timely project. I’ve since found a better composite image from the NASA Deep Space Program Science Experiment (Clementine). … Continue reading “Raw Materials”
  • LSP Proof of Concept
    This LSP Fountain is a project which I have been contemplating for a long time. It brings together my fascination with all things celestial, my interest in wood, life-long experimentation with lighting and electronics, and gradual improvements in my CNC skills.
  • Previous updates
    2020-10-26: The “Nahrung” project is in the early design stage. In the interests of extending my custom woodworking skills, I’ve undertaken another project for now, a more complex one but where I have a clearer idea of the design. The working title is “LSP”. This is my first fully 3D project. I started with a composite image courtesy of the NASA Lunar Reconnaissance Orbiter, used a Fusion 360 plug-in to turn it into an STL file, then imported the STL into Vectric VCarve Pro. From there I was able to generate the tool paths for the CNC. The images above … Continue reading “Previous updates”