18
Mar 20

3D Update

Over the last few weeks, the stringing problem kept going with the 3D printer. And of course, that caused things like the printing head snagging on a piece after 12 hours and dragging it off the bed…

Not great timing. I did reprint and it worked, this time with the experimental tree support structures which look really neat mid-print:

That orientation was pants though, so for the next segment, it was rotated through 90 degrees:

That worked much better.

Of course, when trying to plug one into the other…

Well, sod.
Print another in the right orientation though and…

Mind you, snapping those together was right on the edge of breaking them and it seems like PLA is *not* the right material. Also, that was the last of my first reel of PLA – I came within an inch or two of running out mid-print:

So I got some more, this time not from Creality because a lot of internet experts were sure that creality filament was the source of reliability issues with prints. So eSUN is the new hotness:

First up, as this is PLA+ not PLA, a new temperature tower…

Final layer stuck to the head, but that’s okay, it’s expected that the print ends in failure because you’re looking for limits.

Looks grand under the magnifying glass. 210C it is so I think. Calibration cat time!

And now I have a cover for the end of the Y axis bar as well. I also printed off a light bar to hold some LEDs for lighting….

And then printed a centerfinder/caliper setting gauge that I’ve been trying to print for ages.

The idea being it can be a centerfinder for spindle turning and give you preset (in 5mm increments) references to set a turning caliper off of. Handy.

But for the dust extraction stuff, it looks like both PLA and PLA+ are non-runners. There’s no flex in them so when you push hose segments together, they’ll snap in half rather than flex a little and snap together. So I ordered some PETG as well, but ordered the refil instead of the reel by mistake (eSUN does refillable reels) so now I get to print off a filament reel using filament and this is getting a tad meta…

Two sides down, one hub printing now, and then I can change filament over to PETG, print off a temperature test tower, and get back to dust collection parts.

BTW, finding that blue tape on glass is a much more successful surface than the ones I’ve tried so far. Even hairspray didn’t help much.

More pressing on the 3D front though is that the setup is currently the jankiest setup I’ve janked in a very long time.

That’s three separate power lines in that photo, between the ender3’s PSU, the lab PSU and the raspberry Pi. There needs to be some rewiring, but since all this is getting moved off its desk when the nice man from Ikea arrives, I’ve just not done it yet. (This whole room has to become a home office for two people now, so the printer is going to its own table in the corner).

I have, however, switched over to using OctoPi to drive the ender, and it’s marvellous, it’s where all those timelapse videos come from for a start. It also gives a browser UI to control the printer and monitor its progress via a webcam (a repurposed PS3 Eye in this case because I had one and they’re cheap as chips, but the Raspberry Pi camera and a few others are supported too).

Oh, and I even managed to print a dial indicator holder finally. So. Progress 😀

But next up, moving all of this, rewiring all of this, possibly enclosing all of this and generally a metric buttload of changes. So, y’know, that dust extraction system may take longer than planned. But these days, that’s the standard state of affairs…


01
Mar 20

Buying space

So I kept looking at this and trying to think of where I could stash timber and I kept coming back to the litre-in-a-pint-pot nature of the problem. And some problems you just can’t fix with tidying up stints.

But there’s this little trick you learn in engineering – you can throw money at some problems and they just go away. So I pootled off to homebase and bought a garden storage box (a Keter store-it-out midi for €120 if you’re wondering). And also got the next size up for the garden furniture because it’s driving Claire batty seeing the stuff making the back patio look messy.

Fiddly things to assemble if you get the order of operations wrong and it doesn’t help when your manual is paper mache because someone stored them outside in the rain at the garden center…

Never seen that before. But thanks to online copies of manuals I got them assembled, and spent most of Sunday moving the smaller one onto that little bit of deck outside the shed and then moving all the timber that would fit into the box and tidying stuff up. The difference is… well, pretty noticable when you’re in the shed.

Not done yet, but good grief. I was able to push the bandsaw six full inches to the wall, and I now have enough room in there to actually move around, it’s awesome. I want to put a shelf in the storage box and try to move some of the finishes from the right side of the bench, but that’ll wait for another day.

Oh, and I drilled another doghole in the apron so I’d have a place to put that bench hook for my japanese saws. Works well, wish I’d done it sooner.

The benchtop’s still cramped, but at least now the problem is manageable.

Bolted down the lathe. That was a pig of a job. Turns out, the electronics box (the bit with the switch on the right) hangs *below* the lowest level of the casting when you take off the rubber feet that come with it, so you can’t just bolt the casting down to the stand, you need a spacer (I used M10 nuts for now, but I’ve ordered four ice hockey pucks that I’ll replace the nuts with for vibration damping). And the threading in the casting got painted over so I had to run an M8 tap up through the holes to clean then up, but I had to do that while the lathe was more or less in that position, just swung out a little over the edge to get some access.

And then a misalignment from earlier bit me. When I glued on the top on the stand, I bumped the top at the tailstock end while trying to do the glue-up on the headstock end and didn’t notice (there are downsides to not having any space in the working area beyond inconvenience and safety y’know, the work suffers too):

Out by a full 15mm or so. Which means that the bolt through the top from underneath into the casting is fine on one side of the tailstock and on the other side would require me to cut away a chunk of the crossbar to access the nut. *sigh*

I may need to do that (and it’s at the end where the crossbar can lose a little mass anyway) but for now I just threaded the bolt down from above enough to align everything (so the M10 nut spacer doesn’t drift off and leave the casting unsupported) but it’s not holding the lathe down (and yes, the vibration is now much more noticable). When the hockey pucks get here, I’ll fix that.

I also put up a really quick and dirty shelf from an offcut.

It has some recesses for the faceplate and the chuck and a hole or three for knockout rod, tool rest and chuck key, but there’s more work to do there, not least of which will be a support from the back to the edge of the shelf as it flexes too much and to move it over slightly to get one of the screws at least into a wall stud (and also more holes for things like the indexing pin for the headstock) But it got more stuff off the bench so that’s fine.

I do have a cheap hall-effect sensor based tachometer to fit as well, which will require removing the electronics box and doing some rewiring and also some mounting holes in the casting to get the sensor close enough to the spindle to sense a magnet mounted on that. The black plastic hood does lever back but the geometry means I can’t just drill into that and mount it that way. Need to think abou this a little.

I also need to figure out lathe tool storage.

Yes, I also need to tidy the shavings, I know, I know. But where do I put the lathe tools is the current question. I don’t like the idea of putting them on the back wall because I don’t want to lean over the lathe; I’m thinking more of a small (2×4) array of pvc pipe segments on the wall below the window and angled towards where I’d stand slightly (I only have six lathe tools, but I want to be able to get one or two more in the next few months). They can’t go by the door which was the natural choice because that’s where the sharpening station is going.

There’s also a little camera arm thingy in there so I can try to get timelapse photos and other fun things later.

And those bench hooks and jigs can’t stay behind the lathe, they fall over instantly when you start the lathe up. Not sure where they’re going. Bit of a pain, those. But waaaay too vital to throw away. They’re nearly daily use tools.

That weird-looking thing in the lathe by the way, is me cleaning up this week’s course project, which was a basic tool handle which is right now  holding a saw file. But the bandsaw cut on the back end wasn’t square, and I also had to cut down the ferrule from this:

Still a bit of tidying up to do yet. But at least the long timber is squared away and tied off (and the dowels are in their own 100mm pvc pipe holder).

Need a container for the squeezy bottles of finish and the MMAP and Butane gas though. I might be able to hang those containers off the dust extraction cart if they’re readily removable for when I have to empty that thing. And I have more 100mm hose coming to run the extractor over to the lathe properly, so the sooner I get the 3D printer printing off dust extraction fittings the better. If I can retire the 40mm dust deputy for something like a 100mm Thien cyclone lid for the blue dust barrel, that would work much much better for my little shed as it wouldn’t be banging off the ceiling and I could run the 100m hose to the cyclone instead of the extractor directly.

Did manage to get a 20mm calibration cube to print and it seems I’m getting some reasonable results off the printer.

I mean. they’re parts at least. Not a mess of spaghetti behind the machine where the print head knocked it. Yes, that is the Taj Mahal at the front, the rest are parts for the printer itself.

But it does look like spiderman tried to immobilise it (the extruder head needs to come down a few degrees C I think) and for some reason I’m still getting warping but only on the right hand side of the bed?

Odd. I’m probably trying to print too many objects at once. Oh well. Prioritisation needed. Parts to improve the printer first, then on to dust collection. I’m running low on filament so I ordered another reel, this time from a manufacturer called eSun instead of this stuff from Creality which has more than a few very loud negative reviews from the various forums for these printers. We’ll see.


16
Feb 20

First chips!

Storm Denis, schwarm denis.

Simple 19mm pine footing for the lathe stand. Lap joints and glue at the corners. Got the feet as centered as I wanted them, then pencil around them and since the front two could overhang the bench safely, I could drill, countersink and screw up from beneath into the legs.

Then flipped it over onto the floor, and drilled, countersunk and screwed the other two. And that’s the stand complete, so at that point I stuck it outside for a few minutes during a break in the rain and moved stuff around and then wrestled it back inside.

And it fits! I mean, yes, it’s built to fit but still, nice to see 😀

The back corner is a tad close to the drills and such, but it turns out it’s just far enough away to be usable.

Yeah, that’s gonna take a while. I went through it today and anything that looked like I was hoarding wood got bandsawed into small pieces for the folks to burn. The 2×4 chunks are for turning practice, they’re going to go away in a hurry. The sheet stuff is getting hard to store, but the biggest challenge are those 12×30 ash and oak boards. I cut those to size to make some more of Richard Maguire’s coffee table designs and only ever made the one.

Could always make a few more I guess 😀

The pillar drill’s new storage spot works, which gives me that piece of the bench back at least.

And yes, the lathe does fit on the stand 🙂

It was a fair amount of fun getting that from the front of the house to the shed, and then Denis opened up with hail and rain right as I was unboxing it outside the shed to move it inside and onto the stand. That was fun.

I know it looks tight on the tailstock end there and it definitely is, but it does fit, you can get the tailstock off without smashing the window and you can wind the tailstock even without the handle sticking out the back (the record and coronet lathes we’re using in the course all just have a wheel with no handle, it’s grand, works fine).

And there’s enough space there to work with. Removing that tumbledrier has made a major difference 😀

And it fits! I bought this chuck off Rutlands in a black friday sale and it was demo kit, so it can stick winding it in and out – must take it apart later and see if that can be fixed – but it fits nicely on the spindle nose and I was half-afraid I’d have gotten some weird TPI and would need an adapter.

And it came with a screw center in case I want to be lazy 😀
Think I’m going to want to get a slightly longer tool rest at some stage mind.

Live center fits as well. I mean, that came with it, but I figured I’d check just in case 😀 It’d be just my luck for the 1MT and 2MT live centers to get mixed up in the box and me get stuck with the wrong size 😀

That back wall will need a bit more work. I want to put up some dust collection there (gonna need to run some more 4″ pipe for that and also sort out the power cabling better). I don’t think that wall is going to get hit with a lot of chips in normal use, so it might be safe to leave small tools up there or a small shelf for chucks and faceplates and the like, though reaching across the lathe isn’t exactly the best of ideas. But, 8×12 shed, so I could stand on the far side and still be in a hazard area anyway 😀

And there’s now just enough room between door and lathe stand to put up two of these, stick a 9″ wide board on top and embed the diamond stones in there so I’ll finally have a dedicated (albeit fold-down) sharpening station for the chisels and stuff 😀

Ironically, sharpening the lathe tools will need something completely different that will probably have to live on a french cleat most of the time and on the bench when in use. Oh well.

Anyway, couldn’t put the lathe in and not test it…

It works! 😀 First chips! And soooooo many of them….


Had a small offcut of oak so it was this or burn it. And as tests go, it was useful because I learned a few things. It showed where most of the chips go…

Everywhere, basically. Though not much against the back wall, which is useful. That’s not where the tool tote is going to live btw, I just had to stash it somewhere temporarily. Also, the extractor can just about reach to the lathe at the moment so cleanup was fairly painless.

The other thing, and this was odd, was that there wasn’t any vibration. The lathe didn’t vibrate on the stand and the stand didn’t vibrate around the place.  I mean, it’s a mini-lathe and it was spindle turning, but still, it was kiln-dried oak, not green lime. I expected some vibration, but it was solid as a rock. I need to mount the lathe to the stand for certain, and I need to find some hard rubber washers to go between lathe and stand, but I’m going to hold off on screwing the stand to the floor for now. May need to do this when turning bowls, but for now it looks like we’re okay.

Another thing I need to do is to start printing off some fittings for the extractor – I’ve been having issues with the extruder nozzle on the 3D printer completely jamming up and splooging everywhere this week. It looks like it was a mix of too low a hot end temperature (so the filament wasn’t as fully plasticised as you’d like causing more back pressure) and the PTFE tube on the printer being a bit damaged…

And the end wasn’t square-cut either. So I upped the temperature in the slicer settings and got a replacement tube and fitted that.

And that worked reasonably well.

No spaghetti, just parts. But now I need to look to the dimensioning because those parts all came out the wrong size…

That should sit down more over the bearing but nope. I have a few things to print off for the printer for things like stabilising that Z-axis screw and a better filament guide and so on, but they’ll have ball bearings as component parts (I’ve a bag of those sitting there at the moment) and if they’re not coming out at the right dimension, then the bearings won’t fit and it’ll just be a waste of plastic, like the dial indicator stand which left the dial indicator swivel freely instead of holding it.