USGS map: WI_DevilsLakeSP

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USGS map: WI_DevilsLakeSP

Postby cnczane » Tue Apr 12, 2011 3:10 am

Here's what I've been working on for years. Don't even remember how many.

My machine still sits about 95%, but a fellow I know who'd recently got a hold of a couple of CNC mills asked for something to cut, and I gave him a model of my dad's farm.

The result of seeing a dream actually in a hard model form made motivated me to come up with something that looked like a finished product--which was 3 more weeks out of my shortening life...

Here's the latest, with a North arrow, a logo, and a title. Compare with:
http://maps.google.com/maps/mm?ie=UTF8&hl=en&sll=43.437245,-89.6981&sspn=0.097313,0.170771&ll=43.418765,-89.711609&spn=0.033728,0.077591&t=h&z=14

Whether it can be cut out is entirely theoretical to me still. I would be grateful for any commentary. Real-world experience extra-appreciated, if anyone wants to give it a whirl (18in X x <whatever> Y x 0.505in Z with an 1/8in bit for finish passes).

Thank you.
--
David N
CNC Zane
Attachments
WI_DevilsLakeStParkMC.jpg
The Wisconsin State Park just south of Baraboo, WI ("Home to Circus World Museum! and the HoChunk Native American Casino Complex!") closest to my house.
WI_DevilsLakeStParkMC.jpg (221.5 KiB) Viewed 13898 times
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Re: USGS map: WI_DevilsLakeSP

Postby robgrz » Tue Apr 12, 2011 4:18 am

Looks really nice to me. The only thing that I would look at is how well the text can me machined with a .125" ball mill. It's tough to gauge the size and height of the text in the image but I would make sure that you make sure it's big enough that you will get good definition with that tool.

Be sure to post the results when you're done.

-Robert
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Re: USGS map: WI_DevilsLakeSP

Postby cnczane » Tue Apr 12, 2011 2:16 pm

I had an email this morning from "the kid machinist" that "Devil's Lake is cut out of a chunk of pine."

No further details. No pictures. (No, "gee, it sure is pretty..." ;^) ) I'm going to trek over to his shop after work and see for myself. Pictures at 11...

Here's a link to the binary STL as output by MeshCAM3 at 0.001 precision.
https://docs.google.com/leaf?id=0B1eQGj ... ist&num=50

Do try it--but only if you've completely exhausted all your own ideas, and you're completely caught up with all your own mad projects. (Longest dimension is X=18in, and depth is Z=0.505in. It's 7Mb, and zipped with Linux's gzip util, but any modern archiver can read it.)

This is a model to be loaded into MeshCAM to process into a G-code toolpath.

This is my first serious attempt. Be nice. Thanks.
'zane
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Re: USGS map: WI_DevilsLakeSP

Postby cnczane » Wed Apr 13, 2011 5:37 am

A hunk of pine all right... Hmm, I don't know if ~I'd~ buy something like this... :oops: It looked so much nicer in pretend mode. But at least it TOOK 10 hours... :o

Still neither he nor I have any experience. And it was cut on a metalworking mill, using X-then-Y with only an 1/8" bit.

Our first conclusion is that it needs to be hogged out with at least a half-inch bit. Second is that, X-direction alone may be enough, with the right stepover. And pine's not the best choice, but there it lay. It does seem to shout, "Get that CNC router finished!"
--
I'm beginning to see why I call me 'zane'
David
Attachments
WI_DevilsLakeSP_model.JPG
18" EW; ~ 1/2" depth of cut
WI_DevilsLakeSP_model.JPG (183.26 KiB) Viewed 13879 times
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Re: USGS map: WI_DevilsLakeSP

Postby robgrz » Wed Apr 13, 2011 5:08 pm

I think it looks pretty good. For wood, I usually prefer to mill it pretty quickly with the expectation that a few minutes of sanding will replace a hour or more of machining. The roughness you have should be removed very quickly with a bit of sanding.

If you can make that text a little bigger then I think you'll be happy with it.

Robert
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Re: USGS map: WI_DevilsLakeSP

Postby cnczane » Wed Apr 13, 2011 9:52 pm

Thanks, Robert, I am trying to set my expectations. (The last thing I read before trying mine was Gerry's testimony about "smooth as glass." I thought maybe I'd get "smooth" at least...)
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Re: USGS map: WI_DevilsLakeSP

Postby robgrz » Wed Apr 13, 2011 11:00 pm

You can probably never get a glass finish with pine. 3M makes some great foam-backed sanding pads that are my favorite for finish work. They would probably make quick work of that roughness.

Are you using an 1/8" ball mill or a Vee bit?

-Robert
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Re: USGS map: WI_DevilsLakeSP

Postby cnczane » Thu Apr 14, 2011 2:11 am

A ball.

I wasn't there to see what decisions were made about stepovers either, but at 10 hours cutout time, I don't think a more conservative stepover is in order.

I rejected a flat mill immediately because it was "obviously" going to "show steps." It wouldn't leave those little mounds however.

Wait, I'll bet a bullnose is flat on the bottom like a flat mill and radiused on the sides like the balls... I may be slow, but at least I'm ugly.
--
David
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Re: USGS map: WI_DevilsLakeSP

Postby robgrz » Thu Apr 14, 2011 6:25 pm

A ball is the way to go- it just looked like the cusps were sharper than what I'd expect from a ball but it may be the behavior of the pine. It also looks like you did "X then Y". I know that Randy is a proponent of X then Y but I have never done it (Both Gerry and Randy may disagree on this one). Again, I prefer 5 hours of machining and a little sanding since I will never fully trust my mill to run that long until I can afford a big Haas machine.

-Robert
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Re: USGS map: WI_DevilsLakeSP

Postby jeffD » Thu Apr 14, 2011 7:22 pm

David,

A ball nose mill goes well with MC, all I ever use.

Doing an X and then a Y has never shown me any advantage. One or the other with a very small step over looks the same to me. And a lot quicker. Randy, Gerry, and I might not always agree, but a dual finish pass is really not needed. I do use one or the other but that is model specific, some 4 axis stuff comes to mind. So I am slightly twisted :mrgreen:

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