Probably the most complex thing I've cut so far

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m0n5t3r
Posts: 42
Joined: Fri Feb 03, 2017 2:55 pm

Probably the most complex thing I've cut so far

Postby m0n5t3r » Thu May 02, 2019 5:46 pm

Certainly maxed out the size my MPCNC can cut, I keep postponing that rebuild to make it larger...

sheet fixed with the classic masking tape + super glue combo, then the CNC drilled a bunch of strategically placed holes so I could screw it down, paused, moved out of the way, paused again, then proceeded to cut the rest of the thing...
image20190502_180102194s.jpg
image20190502_180102194s.jpg (196.5 KiB) Viewed 1311 times
FreeCAD file link, because it won't allow me to post it here (too large): https://matrix.m0n5t3r.info/_matrix/med ... wZEPOqrRbi
kisolre
Posts: 558
Joined: Wed Nov 21, 2018 1:13 pm

Re: Probably the most complex thing I've cut so far

Postby kisolre » Thu May 02, 2019 5:59 pm

Nice :)
Here is a FreeCAD screenshot for the curious:
Quadcopter.JPG
Quadcopter.JPG (125.12 KiB) Viewed 1300 times
m0n5t3r
Posts: 42
Joined: Fri Feb 03, 2017 2:55 pm

Re: Probably the most complex thing I've cut so far

Postby m0n5t3r » Thu May 02, 2019 6:24 pm

I placed the bodies in parts hoping that a2plus would import them as separate objects, but nope... anyway, since I managed to get the file organized and looking neat enough I thought I'd share :)
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vesema3
Posts: 3
Joined: Mon Apr 29, 2019 9:00 pm

Re: Probably the most complex thing I've cut so far

Postby vesema3 » Thu May 02, 2019 10:44 pm

Good job, seems a nice build.
The material is some kind of wood, right?
Can this MPCNC cut plastic sheets?
m0n5t3r
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Joined: Fri Feb 03, 2017 2:55 pm

Re: Probably the most complex thing I've cut so far

Postby m0n5t3r » Fri May 03, 2019 8:32 am

some people even cut aluminium with it: https://www.vicious1.com/forum/topic/mo ... m-testing/ (and I think I saw mentions about steel too)

The material in the photo is poplar plywood, so it goes through it like butter (hence the 15mm/s - I think I could go to 20mm/s easily); plastic will definitely work, but might need a different spindle / router, my makita thingy has a fixed speed of ~30k rpm (the dewalt / makita ones with variable speed are roughly twice as expensive, but obviously more flexible; Chinese brushed and / or brushless 50 / 55mm spindles will also do fine and might be more appropriate for plastics, what with the top speed being 12k rpm and stuff)

now to figure out why the tabs and / or slots are oversized oh, the 4mm plywood is 3.8mm thick, that explains a few things... doesn't explain tabs being 0.6mm too short, though
triplus
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Joined: Mon Dec 12, 2011 4:45 pm

Re: Probably the most complex thing I've cut so far

Postby triplus » Fri May 03, 2019 9:09 pm

Nice!
m0n5t3r
Posts: 42
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Re: Probably the most complex thing I've cut so far

Postby m0n5t3r » Sat May 04, 2019 9:14 am

aand, airborne
image20190504_115207797s.jpg
image20190504_115207797s.jpg (148.85 KiB) Viewed 1012 times

managed to get it assembled in a2plus too, with minimal clutter using arch external references (suggested at https://github.com/kbwbe/A2plus/issues/ ... -489298386)

assembly.png
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vesema3
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Re: Probably the most complex thing I've cut so far

Postby vesema3 » Sat May 04, 2019 2:22 pm

Impressive!
m0n5t3r wrote:
Fri May 03, 2019 8:32 am
doesn't explain tabs being 0.6mm too short, though
I don't have practice with such CNC's or even any, but on a first go I would point: wrong dimensioning, another offset at the tabs, and/or positional accuracy of the machine.

Actualy it looks pretty neat indeed.
chrisb
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Joined: Tue Mar 17, 2015 9:14 am

Re: Probably the most complex thing I've cut so far

Postby chrisb » Sat May 04, 2019 2:50 pm

m0n5t3r wrote:
Fri May 03, 2019 8:32 am
doesn't explain tabs being 0.6mm too short, though
Did you inspect the GCode? Is it correct? If yes, the issue obviously is outside of FreeCAD (tool diameter, ...)
m0n5t3r
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Re: Probably the most complex thing I've cut so far

Postby m0n5t3r » Sat May 04, 2019 3:52 pm

chrisb wrote:
Sat May 04, 2019 2:50 pm
Did you inspect the GCode? Is it correct? If yes, the issue obviously is outside of FreeCAD (tool diameter, ...)
I didn't say it was freecad, the gcode looks correct and all holes are pretty much bang on; I suspect a mechanical problem (loose belts or something like that), I'll figure it out when I get time to fiddle with the machine again.