Welcome! Log In Create A New Profile

Advanced

DIY 400x400x200 printer, choice question / doubt

Posted by HugoW 
Re: DIY 400x400x200 printer, choice question / doubt
April 27, 2017 02:33PM
Well, did I mention this would be a slow build? It is... I did some dumpster diving last week at the factory I work at and retrieved some rather large but usefull alloy. So, I can now start assembling the lot.



See you again in a month or two!

Cheers,

Hugo
Re: DIY 400x400x200 printer, choice question / doubt
April 27, 2017 03:43PM
It seems a shame to waste such rigid frame stock on flexible guide rails.


Son of MegaMax 3D printer: [www.instructables.com]
Ultra MegaMax Dominator 3D printer: [drmrehorst.blogspot.com]
Re: DIY 400x400x200 printer, choice question / doubt
April 27, 2017 03:44PM
What part of solid 12mm rails is flexibele?

Cheers,

Hugo
Re: DIY 400x400x200 printer, choice question / doubt
April 27, 2017 04:00PM
End supported rails always flex. The Y axis will be the worst because of the mass of the X axis rails and extruder carriage are riding on them, but the X axis rails are going to flex, too.

My first printer had 12 mm end supported rails and I eventually replaced them with linear guides because they were flexing. Of course, in that machine, the massive bed was riding on the Y axis rails, and your printer's mass on the Y axis rails is going to be much smaller, so maybe it will be OK.


Son of MegaMax 3D printer: [www.instructables.com]
Ultra MegaMax Dominator 3D printer: [drmrehorst.blogspot.com]
Re: DIY 400x400x200 printer, choice question / doubt
April 27, 2017 04:13PM
Quote
deckingman
For info, my Core XY has a build area a tad under 400 x 400 and 740 in Z. The main frame is 600 x 600 x 1,000. I can print stuff like this [www.youtube.com] and this [www.youtube.com] and there are some other things on my Youtube channel. The bed weighs in at around 7kg (10mm thick aluminium topped with 6mm thick float glass) and is lifted by 3 screws driven by a single Nema 17 via a continuous belt. As configured in the videos, the Y axis including the X axis weighed in at 1,900 gms and I regularly print at 90mm/sec. All belts are 6mm gt2 - never a problem.

What diameter screws? just curious.

One thing I like about the CoreXY idea is that you have two motors controlling both x and y axes, so you can keep it stronger or go with cheaper motors theoretically.
Re: DIY 400x400x200 printer, choice question / doubt
April 27, 2017 04:29PM
Each motor needs to be able to drive the total X+Y moving mass at the target speed/acceleration because when the machine is laying down infill at 45 or 135 degrees, only one motor is providing all the force. If you cheap-out and use low torque motors you'll be able to print cubes all day until you get to 45/135 degree infill, then it will start shifting. If you look at the posts from people who have print layer shifting in coreXY machines, the print is usually (always?) shifted at 45 or 135 degrees.


Son of MegaMax 3D printer: [www.instructables.com]
Ultra MegaMax Dominator 3D printer: [drmrehorst.blogspot.com]
Re: DIY 400x400x200 printer, choice question / doubt
April 28, 2017 06:37AM
.

Edited 1 time(s). Last edit at 04/28/2017 01:41PM by newbob.
Re: DIY 400x400x200 printer, choice question / doubt
April 28, 2017 08:29AM
Quote
HugoW
Well, did I mention this would be a slow build? It is... I did some dumpster diving last week at the factory I work at and retrieved some rather large but usefull alloy. So, I can now start assembling the lot.



See you again in a month or two!

Cheers,

Hugo

Nice frame. I would expect for carriage riding on single, normal length, bearing will be wobbly as it's pulled left and right due to bearing tolerances. Looking forward to be proven wrong smiling smiley

Edited 1 time(s). Last edit at 04/28/2017 08:32AM by newbob.
Re: DIY 400x400x200 printer, choice question / doubt
August 02, 2017 05:28AM
[EDIT]Never mind... [/EDIT]

Hugo

Edited 1 time(s). Last edit at 08/02/2017 06:57AM by HugoW.
Re: DIY 400x400x200 printer, choice question / doubt
August 09, 2017 04:00PM
Well, things change over time. Photobucket screws up, so I cannot show the pic, but I think I can link it:

Click for pic

So I hope you can click it and see my progress. I bought the frame bits second hand from someone who gave up, it's nice stuff and fits well. It limits the motion to 340 x 290 x 300mm, but that is OK for now. The bits for the table and Z-movement are on the slow boat from China. The sliding bearings are replaced with Chinese cheap ball bearings. I think the sliding ones will return on a version I can set the tension on, tune them to the rail.

Cheers,

Hugo
Re: DIY 400x400x200 printer, choice question / doubt
August 12, 2017 12:55PM

Sorry, only registered users may post in this forum.

Click here to login