Re: Generating a Sphere

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Bob Bachman <bobach@v...>
wrote:

> I need to generate a 2" diameter 1/2 sphere in a block of aluminum
> to create a mold. I have a Milltronics Partner 3 axis cnc mill. How
> do I go about programing this. I assume I need to use a ball end
> mill (3/4"?) and make a series of decreasing concentric circular
> passes until I reach of a depth of 1".
>
> Bob
>
> [Non-text portions of this message have been removed]

What control do you have? Milltronics?

I don't know Milltronics syntax, here's one way to do it with a
Dynapath control. Your control should do it in a similar fashion.

Using the 3/4" ball end mill program a 90 degree arc in the XZ plane
cutting the cavity from X1.0, Z0.0 to X0.0, Z-1.0. Then a 10
degree axis rotation and repeat with a repeat value of 35.

Tool length offset is the center of the mill's ball end.

N100 S4000 M03 T1 E1
N200 G00 X.625 Z0.5 M08
N300 G01 Z0.0 F15
N400 G02 X0.0 Z-.625 I-.625 K0.0
N500 G00 Z.5
N600 (6) C10/ F200 T35
N700 M30

Line N600 does the 10 degree incremental axis rotation and repeats
the preceding code starting at line 200 for 35 times. If the cavity
shows too scalloped a surface adjust the rotation increment as
needed.

Note: it's late and I programmed from memory, there may be syntax
errors, but the concept is correct. I've done this same type mold
dozens of times and it's this easy.

Doug