Gallery, Projects and General > Project Logs
Sheet Metal Brake and 3d Printer.
S. Heslop:
I've been thinking about dual extrusion but yeah it just seems like a hassle. What i'd want it for is having ABS inserts on the surface of a larger PETG model, so I can glue to the ABS and hopefully reduce the shrinkage/ warping problems of an entire ABS structure. As far as I know the two materials don't adhere so it'd need to be sort of dovetailed in. But then I was thinking I might just be able to have inserts made separately and screwed/ snapped in. Or maybe just try insulating the hell out of the chamber (with water cooling for the steppers etc). Lots of ways to approach problems with this stuff! Water cooling might not be too bad to set up. Aquarium pump and hex brass drilled through with hose barbs machined on the ends, brazed to a larger plate that screws onto the rear of the steppers.
I'm starting to wonder if you could forgo the aluminium plate in between. It's used more as a heat spreader as far as I can tell. But if you painted the bottom of a big tempered glass plate black (with that oven curing glass paint) and set the nicrome wires with a bit of distance, then radiation/ convection would help spread the heat out... Maybe thread the wires around a mica sheet like on a toaster and stick some fiberglass roving underneath. And fiberglass rope to seal around the edges.
Can't find a single mica board big enough but can easily find it in half-size. I'd assume tempered glass won't explode since you'd only be heating it relatively slowly. Thing is how would you monitor the temperature of the plate...
Maybe the way you did it with tape and low voltages is the most sensible solution.
S. Heslop:
Alright those plates arrived. I started to assemble stuff then figured I should probably paint the plates first.
The tolerance on the plates is real incredible. The bearing is a slight press fit into the hole. So paint is going to muck that up. I tried masking the holes with hot glue but it didn't really get into the corners. I still think the idea has legs though since most hot glues don't stick great to metals.
After my usual excessive amount of paint leading to excessive amounts of drips and streaks, it started to rain.
I like black and gold colour schemes, but this gold paint looks kinda crappy.
Still not dry after several hours so I bought them in so they hopefully won't get covered in condensation overnight. They actually don't look so bad in these photos, and really that's all that matters!
Also drilled all the holes in the extrusions.
Actually while writing this post I thought I might as well put the frame together. I was considering that id' need some big washers so the screws arent trying to 'open' the extrusions when pushing into the V groove. But I doubt i'd be putting that much torque on them.
When making stuff in CAD it's been my habit to get surprised by how big it is. But this time it seems a bit smaller than I imagined. Although it'll be larger with an enclosure.
Also it rocks on the desk if its sitting one way, but moved 90 degrees it doesn't rock at all. To me that suggests both my desk and the part aren't very flat. I'll need to investigate it, but part of why I like weldingrod's design so much is that it should be fairly forgiving of things not being entirely parallel. But I'm not so sure about what'd happen if the beams are being bowed.
S. Heslop:
It's like Ikea furniture from hell...
Had to wait a day since the 2 hour dry hammerite spray paint turned out to be more like... well it's still not anywhere near fully cured but it's not so sticky now.
But without any adjustments except rotating the eccentric sleeves on the wheels it moves very freely.
I also made a coupler for the Z axis. I seem to be missing alot of drills from my set in the range of 4.5-5mm so with what I had the hole is fairly oversized, but I think some brass shim might sort that out. I need to make another but right now I also need to take a break. After that it's just the whole Y axis rod, the build plate, and then routing cables.
WeldingRod:
Its thrilling to see another brainchild growing up!
I agree, it's hard to wait on paint! I didn't paint any plates till version... I don't know... 6ish?
Sent from my SAMSUNG-SM-G891A using Tapatalk
S. Heslop:
--- Quote from: WeldingRod on October 13, 2018, 01:53:49 PM ---Its thrilling to see another brainchild growing up!
I agree, it's hard to wait on paint! I didn't paint any plates till version... I don't know... 6ish?
Sent from my SAMSUNG-SM-G891A using Tapatalk
--- End quote ---
I was really in two minds about paint. I kinda like the look of bare metal, but i've had enough stuff rust now to consider paint.
This took me longer than it should've.
Got 2 of the 3 belts installed as well as the Y rod. Had to tilt the idler pulley plate up a bit to make the belt more level. Not sure what went wrong there but i'll need to think about it, but only if it causes problems.
Not my best machining work. I kept making mistakes. At one point a hot chip bounced right up my nostril. Quite unpleasant!
They're little jacks with a locking screw. Leather washers made from some welding gloves I bought that are so shoddily made internally that I cant get my hand inside. I figure a soft washer of some sort would be important to let the table tilt around the holes a bit.
The plate is from an old oven top. I figured the rolled edge might help support that long span better. I don't think it's entirely flat but i'm considering how to rest the glass on top. Blobs of silicone perhaps. But yeah it turns out the grid pattern on the plate is a quite precise 5mm spacing, which made laying out the holes a doddle! All sheet stock should come with a grid printed on it. Just wish I took better care of the plate - did alot of welding and cutting on top of it.
Drove to the coast yesterday to get some filament. That's a lie, I went to get chips and because I sort of vaguely remembered I had a reason to go to the coast. Was hoping i'd remember on the way but I just couldn't till I got back. Aside from that I think I just need make a bracket fo the extruder then figure the wiring out and it should be operational. Who am I kidding something's bound to go terribly wrong!
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