Re: Rugged CoreXY July 18, 2016 01:33AM |
Registered: 8 years ago Posts: 168 |
Re: Rugged CoreXY August 17, 2016 01:58AM |
Registered: 8 years ago Posts: 168 |
Re: Rugged CoreXY August 30, 2016 02:01AM |
Registered: 8 years ago Posts: 168 |
Re: Rugged CoreXY June 03, 2017 07:37PM |
Registered: 8 years ago Posts: 168 |
Re: Rugged CoreXY June 03, 2017 11:44PM |
Registered: 8 years ago Posts: 776 |
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hobbymods
Old mate was delighted with my DXF files and said he'd turn it around quick and cheap for me. Reckons he normally gets a scan of a bit of paper with hand drawn sketches on it from "nut case inventors like me", which he has to drop tools and design for them which he hates, as they don't want to pay for it. So a tip there....do your own DXF files and keep them on side and the costs down when dealing with laser/waterjet cutting companies.
Re: Rugged CoreXY June 04, 2017 07:02AM |
Registered: 12 years ago Posts: 5,796 |
Re: Rugged CoreXY June 04, 2017 07:39AM |
Registered: 8 years ago Posts: 776 |
Re: Rugged CoreXY June 05, 2017 07:11AM |
Registered: 8 years ago Posts: 168 |
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the_digital_dentist
I don't think the threaded rods that are separating the top and bottom plates are going to be rigid enough for printing at even reasonable speeds. You're going to be moving quite a bit of weight around at print speed at the top of the machine and it's going to make the frame shake and wobble. The top and bottom plates will flex with the long lever arms of the threaded rods, and threaded rods themselves aren't terribly rigid- the cross sectional area is pretty small. Adding side and back panels should stiff things up considerably.
Re: Rugged CoreXY June 14, 2017 01:10AM |
Registered: 8 years ago Posts: 168 |
Re: Rugged CoreXY June 14, 2017 01:20AM |
Registered: 8 years ago Posts: 168 |
Re: Rugged CoreXY June 14, 2017 04:55AM |
Registered: 8 years ago Posts: 776 |
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hobbymods
OK,
I was so horrified that you guys thought I'd use threaded rod as a frame, and that there was even a lecture about the weakness of a cardboard box with no lid on it (WTF?!),
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Also making me happy, my 3 lead screw Z platform works beautifully. Took a little setting up, and now the pulleys are different I had to drill some new holes, but it winds from top to bottom without any variation in level whatsoever. There will be 2 linear guides on the rear wall as well, but it looks good so far.
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Another change will be that I will use the Bondtech BMG extruder, which is much lighter and smaller, and specifically for 1.75mm direct drive.
Re: Rugged CoreXY June 14, 2017 06:31AM |
Registered: 8 years ago Posts: 168 |
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lkcl
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hobbymods
OK,
I was so horrified that you guys thought I'd use threaded rod as a frame, and that there was even a lecture about the weakness of a cardboard box with no lid on it (WTF?!),
that's not a very nice thing to say, hobbymods! you're seriously underestimating the value of what i said. flexible materials have the significant advantage of demonstrating (amplifying) design weaknesses. and also have the advantage of taking minutes to assemble a demo / proof-of-concept, from scrap materials that you'll have lying around the house.
whilst everyone else on this forum takes sometimes *months* to verify a design concept, by virtue of them forcing themselves to either implement it fully with CAD software or spend hundreds to thousands of dollars buying materials and actually assembling it, only to find that there's a significant design flaw and they are forced to start again, using cardboard, paper, straws and (strong) tape i am often done in a few hours, giving me full confidence that i can proceed to a CAD design and an actual build, with far less risk and in far less time.
so be kind ok!
also, if you have (had) CAD screenshots dd would have been unlikely to assume that you intended to use the leadscrews (only) for support. this has been a long thread (lots of questions, lots of answers, which we all love doing) if you already did publish some, many many apologies, but that's the nature of forums: nobody remembers (or reads) prior messages on 200+ long threads. can i recommend you create a wiki page on reprap.org so that "static" information is there and can be referred to? you could then put that link into your .sig so that it's always there. things like the 608 bearings you ordered, you could list them on the wiki page, so that even you don't forget.
what do you think?
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Also making me happy, my 3 lead screw Z platform works beautifully. Took a little setting up, and now the pulleys are different I had to drill some new holes, but it winds from top to bottom without any variation in level whatsoever. There will be 2 linear guides on the rear wall as well, but it looks good so far.
nice. i'm a big fan of that arrangement. 3 leads and 2 rails is the minimum and it's *really* effective. doesn't need particularly heavy-duty leads or heavy-duty rails either.
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Another change will be that I will use the Bondtech BMG extruder, which is much lighter and smaller, and specifically for 1.75mm direct drive.
ooo those look reaaally nice! zowee, $80 though. but only 22g so it's seriously worth considering. i like that they're direct-drive and have an internal 3:1 gear ratio, you could consider using lower-spec NEMA17s (lighter weight).
i remember seeing dc42's advice about NEMA17s: he said really, don't bother getting anything other than 0.9deg steppers these days, or running them at anything less than 24v. thought that was worth relaying.
also have you looked at mutley3d's direct-drive flex3drive? drop-in adapter for a NEMA17, it moves the "power" out to a static location, taking away the weight of the NEMA17 but providing far better accuracy, control and a massive reduction in torque, all at the same time. [flex3drive.com]
Re: Rugged CoreXY June 14, 2017 07:25AM |
Registered: 8 years ago Posts: 776 |
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hobbymods
Keep your shirt on, I knew you'd bite for that one. I wish you were a trophy fish.
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Basically I was giving you credit for motivating me back on the job, whilst chafing your arse a bit just for the hell of it. '
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Yes, I think the new BMG is the go.
No I hadn't heard that 0.9 degree steppers were the way forward (are they for corey/cartesian? I thought they were for delta's moreso).
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Yes I've looked at mutleys flex3drive, but don't want to use it.
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I use his Printbite surface by the way and love it.
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My whole project so far is only proof of concept.
I can't do fancy cad drawings...I actually build things and try them.
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And cheers for yours and everyone elses points and tips.