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

Hello Smoke:

I happened to call up MaxNc and ask a number of
questions about how their CNC mill, MaxNC 15 compared
with Serline, Roland and Taig. The fellow I spoke to
said that it could be up to 8 times faster than the
Roland MDX 15 or 20 and 3 to 4 times faster than a
Sherline or Taig when milling 3D objects like the ones
posted at www.rolanddga.com under the features of the
MDX 15 and 20. You'll see sample milled objects. This
fellow stated that the closed loop system or CL parlty
helps to make the MaxNC 15 CL2 a faster machine.
I don't understand why. But apparently this closed
loop system can fairly accurately know where the
machine is milling. I asked another fellow who
carried MaxNc and he too gave me similar milling time
estimates for the same 3D objects. However, he said
the Taig was faster but suffers from accuracy problems
- apparently the machine may not accurately know where
it is milling when it goes through its passes. I don't
understand this exactly and I am probably not
explaining it correclty. Maybe someone could comment.

Mprogee

> Your welcome...I'm looking into the MaxNC15 at the
> moment.
> I plan on going down and visiting the dealer to see
> if it will do what I
> want it to do before making a firm decision this
> time.
>
> I can save the Roland machine for other small art
> type projects I have in
> mind..nothing in wax though!
>
> Smoke
>
>
>
> >Hello Gordon:
> >
> >Thanks for that bit of information. That is very
> >helpful in making my mind up on the right milling
> >machine.
> >
> >
> >Mprogee
> >--- Smoke <gordonr@...> wrote:
> >> 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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> >>
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