Re: Is there a comparison between milling machines and software?

--- In CAD_CAM_EDM_DRO@y..., mprogee@y... wrote:

> Hello:
>
> Has anyone had experience comparing actual speeds milling 3D

objects

> with the range of milling machines under $5000? I am trying to
> determine how long it would take to mill a 3D object like the
> examples on the Roland website
> http://www.rolanddga.com/products/3d/combo/mdx15/mdx15_features.asp
> (3D Max head, Lightwave cow) using other CNC mills such as:

For those kinds of models you might also want to consider a benchtop
router, rather than a milling machine. Unless you plan to make the
part from metal, the routers are accurate enough to be visually
acceptable, but will not machine a tight fitted machine clearance.

The Shopbot benchtop is about $5000 and I believe that it will rapid
at 180+ ipm, and can probably cut most wood and plastic at speeds of
around 60-120 ipm.

If you have access to software that will either calculate the length
of the tool path or a simulation program like meta cut view, they
will tell you how long the cuts will take, at the various machines
cutting speed. Vector Cam can backplot a G-code file of the cutting
path and then calculate the cut time.

One thing to bear in mind if doing ANY comparison to the Roland
machines, they are built similarly to printers. There is not much
strength in the frame, the spindle mount, the spindle bearings, or
the axis drive motors. I have never heard from any Roland customer
that had successfully and satisfactorily machined metals, and even
plastics are problematic for some. Wax seems to be the preferred
material.

I didn't answer your question, but maybe I helped you in your quest
for information.

Best Regards,

Fred Smith
IMService