Re: Is This True or Bad Information

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "mikenln2000"
<msheeley43@m...> wrote:

> This is a letter forwarded to me by a friend,

E-mail is considered PRIVATE. That means that you should keep it to
yourself. Those that don't respect this tend to get fewer or no,
private e-mail responses. One usually asks and acknowledges, that
they have received permission before posting private e-mail in a
public forum.

>
> The deceiving part about the CAD CAM world is that in order to
> make
> most parts yourself (without sending them out) you need to know
> two
> programs. The first program like Artcam, Rhine Matrix,
> Cimigraphy and
> Type3 does the design work producing all the dimension and
> surface
> relief of the item.

Your friend probably has certain kinds of parts in mind. I would
suggest that if you want to make highly detailed parts like the bas
reliefs on a coin, you might need the likes of Artcam, Type3, or
Cimigraphi. I'm not familiar with Rhine Matrix. There are others as
well such as JewelCad for jewelery design.

If you want to make simple prismatic parts, primarily cutting with
the ends and sides of flat end mills and drilling and reaming, these
programs are not a good solution. Bobcad is better because of the
more simplistic approach to creating a part. Draw it as flat
wireframe in X-Y for the most part.

> The second program runs the CNC mill or solid
> modeling machine and turns the design program file into an

actual

> item.

The second program may not be a program at all but a hardware
solution. In most commercial applications of CNC mills
the "controller" is a hardwired solution and software is primarily
involved with user interface, not running the machine. In the hobby
area however, the software controller is more common. This
difference hardware vs software also tends to separate the two areas
hobby vs commercial, with a few minor exceptions (like EMC).

>This is not the case with every system, but is most of the
> time. With any CNC mill the most important part no mater what
> anyone
> says is the speed of the spindle. If the speed is not up around
> 15,000 rpm don't but it.
>

This again depends on matters of Physics, not on opinion. If you are
using a 1 inch cutter in steel at 500 rpm, a 15000 rpm spindle speed
is much less important than machine frame rigidity, workholding, axis
motor torque, and coolant flow.

Best Regards,

Fred Smith - IMService