HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Aug 31, 2005, 08:06 PM
Registered User
Joined Aug 2005
78 Posts
CNC questions (for foam cutting)

I've read a few threads pertaining to CNC on these forums, but I'm not exactly sure what I want/need.

I'd like to build a machine to acurately cut the typical foamie plans in FFF. I get tired of cutting by hand and a (relatively inexpensive) cnc machine interests me for other uses as well.

It seems that a CNC router or a CNC foam cutter is what I am looking for. I think the router is more of what I want. THe foam cutters appear to be more suited to cutting out wings.

Can you use a router on foam? Can you cut profile parts with a CNC foam cutter?

Does anyone out there use a homemade cnc router or foamcutter for cutting FFF and how do you like it? What plans did you use?

From what I have read, the plans on www.kleinbauer.com are respectable.

What do you think?

Thanks
bubbahotep is offline Find More Posts by bubbahotep
Reply With Quote
Sign up now
to remove ads between posts
Old Aug 31, 2005, 09:19 PM
Registered User
Fort Collins, CO USA
Joined Jun 2005
164 Posts
For cutting FFF, I'd think that a vertical hot wire on an X-Y axis would work very well. By not having to cut in the Z axis, you simplify the machine incredibly.

I bought plans off Ebay, which are not as detailed as I'd like, but they describe making a 3D machine out of 3/8 all-thread and some surplus stepper motors "for less than $300". You could very easily do something like that which would be plenty accurate for cutting FFF flat pieces as you don't require .001mm accuracy or anything like that. You could probably do it for $200 or so I'd guess and it'd be a fun project IMO... Maybe once I actually get a stupid motor to work (tried 2 GBv and they suck! grrr) I'll get to build my first FFF and get "hooked" and I'll build such a machine

EDIT: That's a super-cool site you gave the link for -- I bookmarked that for ideas on other machines I've wanted to make!

Mike
micsaund is offline Find More Posts by micsaund
Reply With Quote
Old Aug 31, 2005, 09:47 PM
Registered User
Michigan
Joined Jul 2004
116 Posts
attached picture of my cnc router that I use to cut out foamies. If you have any questions let me know.
planeflier is offline Find More Posts by planeflier
Reply With Quote
Old Aug 31, 2005, 10:02 PM
Registered User
Joined Aug 2005
78 Posts
planeflier...

did you build it yourself?
what are your dimensions?

yours looks expensive!
bubbahotep is offline Find More Posts by bubbahotep
Reply With Quote
Old Aug 31, 2005, 10:06 PM
Registered User
Joined Aug 2005
78 Posts
looked at some of your previous posts, planeflier

good info for me there...thanks
bubbahotep is offline Find More Posts by bubbahotep
Reply With Quote
Old Aug 31, 2005, 11:24 PM
Registered User
Fort Collins, CO USA
Joined Jun 2005
164 Posts
Planeflier: what software did you end-up using? How does that work with the PDF plans (wondering if there's a line tracer routine for pdf or if you re-capture the drawings).

Thanks,
Mike
micsaund is offline Find More Posts by micsaund
Reply With Quote
Old Sep 01, 2005, 06:52 AM
Registered User
Michigan
Joined Jul 2004
116 Posts
micsaund,

I use mach 2 and sheetcam. as far a pdf's I found a shareware program that will convert files from pdf back to dxf file format. I have also used Adobe Illistrator to convert from pdf to dxf or dwg.

Let me know if you have any more questions.

Rich
planeflier is offline Find More Posts by planeflier
Reply With Quote
Old Sep 01, 2005, 09:01 AM
CeNeCe PRO rules!
DaniSaez's Avatar
Barcelona
Joined Jan 2005
714 Posts
micsaund,

I use a home-made hot wire foam cutting machine, and my own software I've develloped.

To cut foam wings, fuselages, letters, any shape you want, shockflyiers, depron, you name it; you can 3D preview, and eve build virtual 3D kits!

You can check the soft at www.cenece.com

in the pics you can see my cutting machine layout (002), at work (004), and the results (005) of cutting an hydro-foam.

Dan
DaniSaez is offline Find More Posts by DaniSaez
Reply With Quote
Old Sep 01, 2005, 09:03 AM
CeNeCe PRO rules!
DaniSaez's Avatar
Barcelona
Joined Jan 2005
714 Posts
BTW, the soft is called CeNeCe PRO!

;-)
DaniSaez is offline Find More Posts by DaniSaez
Reply With Quote
Old Sep 01, 2005, 01:07 PM
Soil Density Tester
TexasAce's Avatar
United States, TX, Bonham
Joined Feb 2004
404 Posts
The problem with a vertical hotwire is gravity. How do you support the foam and connect to the wire underneath the foam? Routers don't have this problem.
I told my wife I wanted a laser cutter for Christmas. She suggested a letter to Santa. I'm not sure how to take that.
TexasAce is online now Find More Posts by TexasAce
Last edited by TexasAce; Sep 01, 2005 at 01:07 PM. Reason: kant spail
Reply With Quote
Old Sep 01, 2005, 08:15 PM
New Jersey
Joined Oct 2003
1,655 Posts
Here is where you need to go if you want to know everything about cnc http://cnczone.com and check out my cnc laser- http://www.cnczone.com/forums/showthread.php?t=7427
furyflyer2 is offline Find More Posts by furyflyer2
Site Sponsor
Reply With Quote
Old Sep 02, 2005, 04:23 AM
CeNeCe PRO rules!
DaniSaez's Avatar
Barcelona
Joined Jan 2005
714 Posts
Hi TexasAce, just place the foam on the table. btw, I don't see why you want to connect the wire "underneath" the foam??

In my case I'm not using a bow to hold the wire, it is fixed on one side, and has a small weight on the other to keep the wire tight. If I want to place my wire under the foam, I just have to connect the wire after placing the foam. I use this system only with depron, to keep it hold and tight, for normal thicker foam you don't need those supports.

I wouldn't say gravity is a problem for vertical hotwire cutters, on the contrary, for the vertical axis, gravity eliminates any gap or backslash you might have, as tension is allways kept in the same direction.

Furthermore, for flat shapes, I agree with you tha a router might be more adequate, but when it comes to 3D shapes... You cannot cut a hollow fuselage 10x15x50cm with a router, can you?

Dan
DaniSaez is offline Find More Posts by DaniSaez
Reply With Quote
Old Sep 02, 2005, 09:40 AM
It's been a while.
Daniel G's Avatar
Irvine, CA
Joined Jan 2005
2,690 Posts
http://www.rcgroups.com/forums/showthread.php?t=120967
http://www.rcgroups.com/forums/showthread.php?t=333499
Daniel G is offline Find More Posts by Daniel G
Reply With Quote
Old Sep 02, 2005, 12:53 PM
Thread Crapper
JohnVH's Avatar
Lynden, WA
Joined Nov 2000
2,845 Posts
Hi, the best cleanest method is a laser, which is how all my kits are cut, the plywood and plastic are also cnc laser cut in our shop. BUt, these can get spendy.
JohnVH is offline Find More Posts by JohnVH
Reply With Quote
Old Sep 02, 2005, 07:26 PM
Registered User
Joined Aug 2005
78 Posts
DaniSaez,

Interesting that you would say gravity is a help! I was reasoning that gravity would be a big problem, so initially I was leaning toward the router.

So for cutting the typical foamie plans you would reccomend the foam cutter over a router?
bubbahotep is offline Find More Posts by bubbahotep
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Found Allegro UCN5804b stepper controller chips for cnc router or foam cutting stealthy Aircraft - General - Miscellaneous (FS/W) 0 Feb 05, 2006 08:46 PM
CNC software for foam cutting KAMarks The Builders Workshop 0 Sep 15, 2002 08:20 PM
Using Orbit charger for foam cutting tom_yellowblue Power Systems 6 May 02, 2002 02:49 PM
Templets for foam cutting J Morgan Power Systems 29 Feb 18, 2002 05:38 AM
Computer Power supply for Foam Cutting? dwood99 Foamies (Kits) 5 Jul 18, 2001 01:22 PM