2.5d or 3d

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SmokyRick
Posts: 168
Joined: Sun May 11, 2014 7:22 pm

2.5d or 3d

Post by SmokyRick » Sat Jun 14, 2014 12:20 pm

Hello Guys - What really is 2.5d? Do I need a cam program that is 3d or is 2.5d what I need? I just got the ShapeOko 2 up and running and haven't decided on a cam program as yet. I have been writing my programs by hand. My machine is straight from the standard kit with no upgrades yet. I need a freeware program that is NOT online. We live out in the country and have very slow internet service that occasionally stops altogether. Being online is always chancy. What do you think is my best bet for a cam program?
Thanks,
Smoky Rick
Smoky Rick Crawford in the middle of Northern Illinois, USA.
ShapeOko2 s/n 5200 all stock. Arduino, gshield, Grbl Controller, Autodesk Fusion 360.
Mods: Quiet cut spindle, grbl v0.9g w/ spindle control enabled.

Marty M.
Posts: 66
Joined: Sun Feb 09, 2014 3:42 pm

Re: 2.5d or 3d

Post by Marty M. » Sat Jun 14, 2014 12:33 pm

Cambam is a pretty good program for free that is saved to your computer. After 40 uses, it loses some functions if you choose not to purchase it, but I've been doing quite a lot with it. I use Rhino for 3d. You'd have to download it though or purchase it.

SmokyRick
Posts: 168
Joined: Sun May 11, 2014 7:22 pm

Re: 2.5d or 3d

Post by SmokyRick » Sat Jun 14, 2014 12:47 pm

Downloading is not a problem, as if I have trouble at home, I can do it at work and bring it home on a thumb drive. I will check into Cambam. Still really unsure what 2.5d or 3d means.

Thanks for the reply,
Smoky Rick
Smoky Rick Crawford in the middle of Northern Illinois, USA.
ShapeOko2 s/n 5200 all stock. Arduino, gshield, Grbl Controller, Autodesk Fusion 360.
Mods: Quiet cut spindle, grbl v0.9g w/ spindle control enabled.

cvoinescu
Posts: 4442
Joined: Thu Jul 19, 2012 6:50 pm
Location: Camberley, UK
Contact:

Re: 2.5d or 3d

Post by cvoinescu » Sat Jun 14, 2014 3:31 pm

Proud owner of ShapeOko #709, eShapeOko #0, and of store.amberspyglass.co.uk

SmokyRick
Posts: 168
Joined: Sun May 11, 2014 7:22 pm

Re: 2.5d or 3d

Post by SmokyRick » Sat Jun 14, 2014 3:48 pm

Thanks, that really helped get it all clear. So 2.5d is all I need for programming this standard ShapeOko 2.

Thanks again,
Smoky Rick
Smoky Rick Crawford in the middle of Northern Illinois, USA.
ShapeOko2 s/n 5200 all stock. Arduino, gshield, Grbl Controller, Autodesk Fusion 360.
Mods: Quiet cut spindle, grbl v0.9g w/ spindle control enabled.

Woodworker
Posts: 639
Joined: Tue Mar 11, 2014 1:37 am
Location: 5 miles north of Benson, NC

Re: 2.5d or 3d

Post by Woodworker » Sat Jun 14, 2014 4:55 pm

For me this is still vague but if for example, I wanted to do a pocket with a curved bottom, would that be 3D? To create such a shape would Sketchup be the best free choice? Would MakerCAM understand the input for such an object?
BRuce - SO2 #4798 - IC's Z axis upgrade, customized Z rail and Z motor mount, spindle Dewalt 611

Auarhau
Posts: 243
Joined: Tue Feb 25, 2014 8:46 pm

Re: 2.5d or 3d

Post by Auarhau » Sat Jun 14, 2014 11:11 pm

As far as I know a curved bottom would be 3D, and Makercam could not do this. You could approximate this by making progressively smaller rings with lager depth of cut.

In my head a 2d drawing is what you see when you make a simple outline pencil drawing. In cam you can also add depth to this image, which would be Z depth of cut. And this 2D image with a depth to it would be 2.5D (which is a very confusing and bad terminology). Curved bottoms, and other types of "organic" shapes and overhangs etc is what I call 3D. I too struggle to determine the absolute difference between the two though, since you can approximate complex curved shapes with finely adjusted 2.5D operations.

For the OP I recomend to look at https://sites.google.com/site/heekscad/ It's the most sophisticated free program I have run across. There are payed options that does make lief a lot easier though, it all depends on your use.
ShapeOko 2. Nema 17 74 oz·in. GAUPS shield on Arduino Uno. DRV8825 Drivers x4 . Kress 1050 FME-1. Z Acme Screw. Threaded inserts table.

Woodworker
Posts: 639
Joined: Tue Mar 11, 2014 1:37 am
Location: 5 miles north of Benson, NC

Re: 2.5d or 3d

Post by Woodworker » Sun Jun 15, 2014 12:42 am

Thank you Auarhau, this confirms my belief and to some extent makes the 2.5D understandable. Hmm hadn't thought about a tiered approach to a spherical bottom, I will have to design one today and try tomorrow. Thanks you for the reply and suggestion.
BRuce - SO2 #4798 - IC's Z axis upgrade, customized Z rail and Z motor mount, spindle Dewalt 611

Auarhau
Posts: 243
Joined: Tue Feb 25, 2014 8:46 pm

Re: 2.5d or 3d

Post by Auarhau » Sun Jun 15, 2014 9:41 am

If you try that approach, I think a large ball-nosed end mill would make life easier. But for anything other then testing and goofing around I would use a proper 3D cam if I needed to make this kind of geometry 8-) I hear good things about meshcam, but haven't tried it myself yet.
ShapeOko 2. Nema 17 74 oz·in. GAUPS shield on Arduino Uno. DRV8825 Drivers x4 . Kress 1050 FME-1. Z Acme Screw. Threaded inserts table.

Woodworker
Posts: 639
Joined: Tue Mar 11, 2014 1:37 am
Location: 5 miles north of Benson, NC

Re: 2.5d or 3d

Post by Woodworker » Sun Jun 15, 2014 11:48 am

Ran across this link and I'm guessing this would be 2.5D and a real bowl would be 3D
http://www.pinterest.com/pin/5703387402 ... edium=2004
BRuce - SO2 #4798 - IC's Z axis upgrade, customized Z rail and Z motor mount, spindle Dewalt 611

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