I'm thinking seriously about getting a CNC.  Been browsing on Ebay.  Mostly these China made 3020 cnc machines are popping up, and they all seem to  be relatively well priced.  Just thought I'd get some opinions from members on any actual experience on these.  Also any recommendations on getting a hobby CNC machine in general would be greatly appreciated.  I'm planning on using the machine to make hub plates, motor mounts, etc.  I'd probably be milling aluminium and/or carbon fibre.

LIST OF EQUIPMENT UNDER CONSIDERATION:

Motors/Controllers:

  1. cadcamcadcam.com (servo motors and controller)
  2. 3-axis Stepper Motor System based on DQ542MA, on Ebay
  3. 6-axis Stepper Motor System based on DQ542MA, on Ebay
  4. DC1 Servo Motor Controller, from Makerbot
  5. Servo Motor Encoder

05/26/2012:  After some discussion.  This blog is starting to look into building a CNC machine of our own.  Keep following to stay informed.  We're in the brainstorming stage at this point any input from users is welcomed.

05/27/2012: DIYDrones CNC Project group is created.  Let's move our activity to that group.

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Comment by Emin Bu on May 27, 2012 at 1:33am
Comment by wayne garris on May 27, 2012 at 3:01am

here is my home made cnc machine

i used an old truck bumper some .5 inch cold roled square steel , various angle iron and some acme lead screws and nuts .and rollerskate bearings for the slides running servos from cadcamcadcam.com  and mach3 on a computer . i get 80 ipm and servo encoders ensure no missed steps . i put the whole thing together for ~ $1300 . i can get about .005 accuracy while cutting wood . i would be more then happy to get more close ups of it and share the plans if your interested . i get 42 x 24 x 4 travel .

Comment by Ellison Chan on May 27, 2012 at 7:08am

Wayne, great stuff on that servo motor link.  The specs say they operate at 30V.  How are they for milling aluminum, and harder materials?

Comment by Ellison Chan on May 27, 2012 at 7:14am

Monroe, the only cad skills I have is with Blender 3D.  That's how I designed my frames.

But I do have this program call, "Creo Elements Direct Modeling Express", which does real CAD.  Post your drawings, and let me see what I can come up with, while learning to use that Creo program.

Comment by Kevin Bouchard on May 27, 2012 at 7:52am

Monroe, I have some training with 3D CAD (using mostly SolidWorks), what do you need done? I don't have much time in the coming week, but maybe I can do a few parts.

I can also help Ellison with code. I'm still studying CS in school though so I might not be as quick as any of you, but I can probably lift *some* weight.

Also, we should probably find a better means of communication than this comment section.

Comment by Ellison Chan on May 27, 2012 at 7:59am

I'd like to keep the communication open to all.  I will post summaries on the top of the blog. (I currently have a list of equipment under consideration)

Comment by Ellison Chan on May 27, 2012 at 8:12am

Ok, I'm thinking that before this blog gets to over bloated, I should create a group, and move the discussion there.  So, I've created a group and sent in the request.  When it's approved, I'll add some discussion there, and close this blog.

Comment by Ellison Chan on May 27, 2012 at 10:31am

Ok Folks the group has been approved.  Please let's move our discussion over there.

http://www.diydrones.com/group/diydrones-cnc-project

Comment by Ellison Chan on May 27, 2012 at 4:29pm

Here's a motor encoder I found on Ebay ($125 each):

http://www.ebay.com/itm/NEW-Accu-Coder-Model-260-Encoder-for-12mm-S...

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