40186Re: [hobbicast] [off?] CNC Machine Running
- Feb 1, 2010On Feb 1, 2010, at 8:39 AM, Todd wrote:
> Jeshua, nice work! I've been working on a Gingery Lathe for about 4Sounds like a great project. One of the first things I plan to do with
> months w/o nearly the progress to show for it :o).
my CNC machine is make the patterns I need to make a turntable and a
lathe "attachment" for the CNC machine...
> Q: What is the 3D visualization/CAD software that you show in theIt is a free application called Meshlab. It is not so much for
> part of your demo?
modeling as it is a great 3D utility.
I used it to reduce the complexity of the model that the CNC machine
made and saved the model as a DXF as was required by Pycam.
> Q: You mention in the thread that you used pycam. Could youI have been evaluating Vectorworks. It will create true surfaces or
> elaborate on
> your CAD tool chain...and how well it's working for you? I've been
> QCad...but it's a 2D only option...though somehow they have an
> additional GCode module, too.
solids that can be used by high-end CAM software.
The bonus for me is that it runs natively on the Mac.
But for my first run, I just download a free model, reduced the
complexity in Meshlab (on my Mac) and saved as a DXF, then copied to
my Linux machine, opened the DXF in Pycam, saved the G-Code, and then
opened in the EMC machine controller software.
The cool thing is it was all done just between my Mac and my Linux
machine from which I can control on my Mac. So I feel right at home.
> Q: You mention using the Roton ballscrews/nuts for your z axis... haveIt is so efficient that when I got the ballscrew, just the weight of
> you needed a brake? I ask b/c the Roton site claims that the
> of force to rotation is so efficient that their devices cannot be
> counted on to self-brake.
the ballnut would make it roll down the screw by gravity alone. It got
up to a pretty healthy RPM too. So I wasn't sure if I would still need
a break. I thought if nothing else, it would be much slower than a
But once I mounted it on my machine, the TDK rails with such a tight
tolerance was just enough friction that it does not require a break. I
think if it was using skate bearings instead of TDK bearings, it would
like still need a break. Or if my router was any heavier....
> Q: What linear motion system are you using, and what are it'sI am using a different linear system for each axis.
> performance characteristics (flatness, deflection, etc.)?
I would have liked to use TDK everywhere - but the get very spendy
when you need them 5 feet long.
For my big Y carriage I am using VXB bearings:
For my X, I am using a skate bearing carriage that I got from:
It just used a 1/4" steel plate for the guide. If I were to do it
again, I would use these for the Y as well. Very nice system, low
cost, cheap and easy to replace the bearings, and the bearings are
sealed. The VXB system, the bearings are essentially open.
And for the Z, I picked up some used TDK linear bearings on eBay.
As for deflection, all of the rails are mounted on very rigid
surfaces, so I think that would be very minimal.
> My plan is to build the Gingery series and then start on a CNC...Good luck! Sounds fun.
> probably very similar to yours. At my current rate, I should be
> that project in about 2-5 years :o).
Jeshua Lacock, Owner
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