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

I don't know anything in the way of comparisons but I do know from
experience on my Roland MDX machine that Rolands software generates a huge
machining file which creates a lot of un-necessary motion. I know this just
from watching the machine machine over the same area several times machining
air on the second and subsquent passes.

I also know that on this machine it is terrible for cutting wax as the
spindle speed is way to high for this material and is non-adjustable.

>--- 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
>
>
>
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