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Old 09-11-2010, 08:30 PM
cdesfablab cdesfablab is offline
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Default UMN router webpage up

We've got an introductory webpage up for our users and I'm finding and looking for some great tutorials and such to point our students to.

Some of my comrades from the Society of Academic Workshops (SAW) have shared some great stuff. The RhinoCam videos from Syracuse DesignWorks may be better than the great ones that MecSoft have published themselves.

I'm looking for more, so please share great CNC resources if you've got them.

I'm looking for some good feed/speed tables. Yes I know about chipload calculation, but I'd like to develop some suggested rates so that I'm not getting toolpaths that are WAY off base.

We should be posting some pics/videos soon. Still waiting for a new post for the rotary, cant wait to try milling some skyscrapers.

We're thinking about putting a webcam on the router too, just imagine the wasted minutes that will generate!

-kg
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Last edited by cdesfablab; 09-11-2010 at 10:25 PM.
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Old 09-11-2010, 10:21 PM
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james mcgrew james mcgrew is offline
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kevin this is some good work, i will move you to a UMN forum heading so the work can be compiled as an additional aide to architecture students
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Old 09-11-2010, 10:32 PM
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This is great stuff I look forward to more.
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Old 09-12-2010, 10:11 AM
Eric Mims Eric Mims is offline
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onsrud's catalog has pretty good calculator, and so does Belin's tool catalog. http://www.belintools.com/Catalog.pdf
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Old 09-12-2010, 11:44 AM
Eric Mims Eric Mims is offline
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a couple other things.. before I built my vacuum table setup, I used screws to hold down with. Some materials, like soft plastic sheets, required many screws all over the board, so I would put points in Rhino where screws could safely go on the board, then drill down a fraction to mark the material in those areas. Vacuum is the way to go in the future if you don't have it already, especially if you have 3phase (lots of options). I don't have 3ph but it was worth the trouble.

Make sure the kids know they can engrave in rhinocam, to have the bit follow 3D curves exactly. I am sure some of them will want to make textured panels, etc, and that's a good way to do it in Rhino. The profile toolpath will also convert 3D curves into 2d first and make a 2d toolpath. Also, on the Profile toolpath, you can set the leave Stock setting (under cut parameters) to a negative number, which will essentially engrave on the selected curves, but allow you to have settings like bridges, detailed entry/exit, and other things not available on the Engrave function.

Also, make sure they understand 'Regions' when doing things like parallel finishing, so their run time doesn't go to the moon. And if you are using regions with a 3d model to horizontal or parallel machine, double check the toolpath from a front/right view to make sure there isn't an empty spot outside of the model that could possibly get milled (causing the bit to want to drop all the way down as far as possible). You can always draw a plane underneath your 3d objects to represent your minimum Z to insure that won't happen.

Long winded, I know.. but say you are carving large 3" thick letters, and the top 1" of the letters is rounded over or has carving. If you use the letter curve as the Region, your ballnose bit won't really go outside of that boundary and you may end up with scallops around the edge of all letters. But if you offset your region boundary curves to allow room, the parallel toolpath could sometimes want to drop off the face of the earth after it got outside of the 3d shape. So you can make a physical plane in Rhino, or you can set the Z Containment lowest Z setting in Rhinocam. Just always visually check your toolpaths and you should be ok. So in a case like above, you'd want to set your lowest Z containment to 2" Z. There would be no reason for the ball end bit to raster down the vertical edges of the letter.. just do the top 1" of the letters, then come back around with a straight bit for cutout.
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Old 09-12-2010, 11:57 AM
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kevin, in case you have not been introduced eric mimms is an architect with an x3!
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Old 09-14-2010, 11:26 AM
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i have moved UMN to its own forum
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The principle of Measure twice cut once has not been replaced by a CNC

www.mcgrewwoodwork.com

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Camera 1 ATC Closeup !
https://video.nest.com/live/esNTrZ
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