Wildseyed's Scaled Mesheldrake 2.0

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Wildseyed's Scaled Mesheldrake 2.0

Postby wildseyed » Wed Mar 21, 2012 5:14 am

IMG_20120324_095847.jpg


Maybe some of you have come across http://www.thingiverse.com/thing:12864 by mesheldrake. AFAIK nobody has tried using his OpenSCAD scripts to build one of these yet, but I could be misinformed.

I've thrown caution to the wind, and decided (mostly out of necessity) to scale it up large, but keep the 2020 profiles. It's been a couple of months since I generated the BOM, and I don't recall the exact work area dimensions, but I think it was something like 24" x 38" x 12". It may have some rigidity issues that will have to be addressed.

I started putting the frame together this evening, but my laser tube is held up in customs, and has been for over a month. At this point, I doubt they will be delivering it. Usually, when it takes this long, it means the F***ed it up.

I had 8020INC quote me on cutting the panels out of Alumalite, and they came back with $900.00! I don't think so 8020!

Here is the BOM, as generated by the script:

ECHO: "GANTRY"
ECHO: " MakerSlide: 1 x 1465mm (57.67716535433071in)"
ECHO: " MakerSlide: 2 x 1221mm (48.07086614173229in)"
ECHO: " EconoBelt: 1 x 3048mm (cut) (120in, rounded up)"
ECHO: " EconoBelt: 2 x 2336.8mm (cut) (92in, rounded up)"
ECHO: " (shaft src): 1 x 736.5999999999999mm (29in)"
ECHO: " (shaft src): 1 x 685.8mm (27in)"
ECHO: "Z TABLE"
ECHO: " 2 x HFS5-2020-1342 1342mm (52.83464566929134in)"
ECHO: " 2 x HFS5-2020-1031 1031mm (40.59055118110236in)"
ECHO: "Z TABLE PANEL"
ECHO: " 1 x C19010 1342mm x 1071mm (52.83464566929134in x 42.16535433070867in)"
ECHO: "Z LEADSCREWS"
ECHO: " 3 x B18009-xxxx (0.25in,20tpi threaded rod) 407.2mm (16.03149606299213in)"
ECHO: " 1 x B18009-xxxx (0.25in,20tpi threaded rod) 458mm (18.03149606299213in)"
ECHO: "Z CLOSED BELT"
ECHO: " EconoBelt: 1 x B28035 (loop timing belt) : close to 3866.481824369909mm (~152.2in, rounded)"
ECHO: "FRAME"
ECHO: " Misumi 2040:"
ECHO: " 2 x HFS5-2040-1722 1722mm (67.79527559055119in)"
ECHO: " Misumi 2020:"
ECHO: " 4 x HFS5-2020-514 514mm (20.23622047244094in)"
ECHO: " 3 x HFS5-2020-1722 1722mm (67.79527559055119in)"
ECHO: " 3 x HFS5-2020-1492 1492mm (58.74015748031496in)"
ECHO: " 1 x HFS5-2020-1487 1487mm (58.54330708661418in)"
ECHO: " 7 x HFS5-2020-1221 1221mm (48.07086614173229in)"
ECHO: " 1 x HFS5-2020-230 230mm (9.05511811023622in)"
ECHO: " 1 x HFS5-2020-90 90mm (3.543307086614174in)"
ECHO: " 1 x HFS5-2020-364 364mm (14.33070866141732in)"
ECHO: "COVER"
ECHO: " 2 x HFS5-2020-1487 1487mm (58.54330708661418in)"
ECHO: " 2 x HFS5-2020-1101 1101mm (43.34645669291339in)"
ECHO: "COVER WINDOW PANEL"
ECHO: " 1487mm x 1141mm (58.54330708661418in x 44.92125984251969in)"
Last edited by wildseyed on Sun Mar 25, 2012 4:10 pm, edited 2 times in total.
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Re: Wildseyed's Scaled Mesheldrake 2.0

Postby TLHarrell » Wed Mar 21, 2012 5:35 am

Wow. 14 decimal place tolerance?
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Re: Wildseyed's Scaled Mesheldrake 2.0

Postby wildseyed » Fri Mar 23, 2012 2:25 am

So far, the only challenging thing about this build is the inability to identify parts by dimension. The OpenSCAD script does not cross-reference the original parts when it generates the BOM. Fortunately, the drawings are excellent, and easy to follow. So far so good.

If you care to peek in you can watch the build nightly at http://wildseyed.com:9090/, and if you're lucky, you may catch a glimpse of some of the prototypes I'm going to be cutting with this baby. Yes, I know, very grandiose ideas, but hey, Cristobal Colon didn't get to the New World building dingies :)
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Re: Wildseyed's Scaled Mesheldrake 2.0

Postby jv4779 » Fri Mar 23, 2012 6:33 pm

I built a 2.x scaled to 36" x 18" and the rigidity is fine. The vertical is exatly the same as stock. The only thing that isn't perfect is the x-axis cable chain. The model used for stock 2.x is not strong enough to span the new longer gantry and drags on the gantry at the limits of travel. I think it will finction but sure isn't pretty.

It was lucky I did scale it up. They shipped me an "upgraded" 45w tube that is much longer than the 40w I ordered and wouldn't have fit in stock.
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Re: Wildseyed's Scaled Mesheldrake 2.0

Postby TLHarrell » Fri Mar 23, 2012 8:12 pm

I'd drop a tray made of aluminum C channel under the cable chain on something that long. Can't wait to see more.
40w Full Spectrum Engineering 5th Gen Hobby 20"x12" w/ Rotary Engraver
South San Francisco Bay Area - Sales and Support Representative for Full Spectrum Engineering
408-47-LASER - Skype: whitelightlaser-thomas - Facebook: White Light Laser
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Re: Wildseyed's Scaled Mesheldrake 2.0

Postby wildseyed » Fri Mar 23, 2012 8:56 pm

@TLHarrell Dang! You just reminded me that I don't have cable chain ordered. Hmm...
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Re: Wildseyed's Scaled Mesheldrake 2.0

Postby AndrewR » Fri Mar 23, 2012 9:49 pm

TLHarrell wrote:I'd drop a tray made of aluminum C channel under the cable chain on something that long. Can't wait to see more.


Like this!

http://www.youtube.com/watch?v=0ZqZpaC3 ... 0w&lf=plcp
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Re: Wildseyed's Scaled Mesheldrake 2.0

Postby mesheldrake » Fri Mar 23, 2012 10:22 pm

Brave. I've started ordering parts based on my OpenSCAD model too, but haven't done the frame buy yet. Good to hear that it went together right.

24" x 38" x 12" sounds way too big to me. I made the scaling script so I could add inches, not feet. But I'm glad I could help with exploring the larger limits of bdring's design, even if it's just to discover that you've gone too far. Here's to ambition, and remedial reinforcement.

For the next version of the OpenSCAD script:

- Cross references to original extrusions would be good.
- Cable carrier should be in there.
- Could use a little less precision on the inch conversions.
- Reference objects like different Watt/length/diam. laser tubes, and the minimum power+electronics space needed should be in there, to visually confirm it all fits.
- I think the latest OpenSCAD has better text output options, so maybe the formatting there will improve.

There might be other items that need to scale that will become clear as my own build proceeds. I figure I'll revisit the script, and do an updated version in the newest OpenSCAD, when I've got a working frame and motion system with motors and belts going.
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Re: Wildseyed's Scaled Mesheldrake 2.0

Postby TLHarrell » Sat Mar 24, 2012 3:08 am

AndrewR wrote:
TLHarrell wrote:I'd drop a tray made of aluminum C channel under the cable chain on something that long. Can't wait to see more.


Like this!

http://www.youtube.com/watch?v=0ZqZpaC3 ... 0w&lf=plcp


Not the way I'd do it, with the machine dragging the cable in the tray. More like the other way where it can unroll into the C channel.
40w Full Spectrum Engineering 5th Gen Hobby 20"x12" w/ Rotary Engraver
South San Francisco Bay Area - Sales and Support Representative for Full Spectrum Engineering
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Re: Wildseyed's Scaled Mesheldrake 2.0

Postby AndrewR » Sun Mar 25, 2012 2:49 am

TLHarrell wrote:
AndrewR wrote:
TLHarrell wrote:I'd drop a tray made of aluminum C channel under the cable chain on something that long. Can't wait to see more.


Like this!

http://www.youtube.com/watch?v=0ZqZpaC3 ... 0w&lf=plcp


Not the way I'd do it, with the machine dragging the cable in the tray. More like the other way where it can unroll into the C channel.


So, more like his x-axis. Plenty more videos on his YouTube channel.
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