Gallery, Projects and General > Project Logs
Sheet Metal Brake and 3d Printer.
WeldingRod:
Since this thread is worthless without pictures, I dug some up!
You can see my base using triple wide extrusions in a kind of double-barred H; this lets me bolt through without having stuff intersect. I use the side pocket for the power supply and brain.
One shot clearly shows the wheel-on-flat system I use on the far end of the Y and Z axis. The idea is to only constrain one thing: rotation around the other extrusion. Another shot shows the controlling Z and Y plates; these all run in the V-groove.
S. Heslop:
I appreciate the pictures. I also appreciate seeing a machine where the gantry moves up and down. It seems to be a rare arrangement for some reason.
I really like the look of the whole drive mechanism. Every time I look at coreXY and similar stuff it just seems overly complicated and prone to more problems than it'd solve (I get the feeling stuff like H bot and CoreXY is just trendy renaming of older plotter ideas). It's also interesting how you've refrained from joining the two vertically moving struts to make a box, but thinking about it - it does make more sense to do it that way and avoid over-constraining.
Is that machine a work in progress still or is it working?
S. Heslop:
Oh yeah a question i've been meaning to ask is 'whats the deal with PETg?'. From what I read a while ago it was spoken as if it was a wondermaterial. Strong as ABS but without the shrinkage and need for a heated chamber, and didn't seem too expensive either. But i'm still finding plenty of stuff that suggests people haven't given up on ABS despite that.
I do realise that for a large machine having a heated chamber would make things complicated. I've seen people struggling with cooling stepper motors but i've not heard much mention about thermal expansion, which I assume would cause issues. Especially if the whole thing heats up during the print.
WeldingRod:
There are about a dozen of my bots out working, and mine has been banging out parts for years. There's even instructions!
Sent from my SAMSUNG-SM-G891A using Tapatalk
WeldingRod:
PETG is good stuff! However, it doesn't glue worth a darn. Pretty sure paint is out too. You've got to make your part ready to use.
Just enclosing your printer improves all the thermal stuff a LOT. That's what I do; waste heat from the bed is it. I put the electronics at the air intake to keep them a bit cooler. My old small printer used a light bulb and a dumb temperature switch to add a bit more heat.
Sent from my SAMSUNG-SM-G891A using Tapatalk
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