Re: [CAD_CAM_EDM_DRO] Re: Simultaneity/versatility of movement

On Mon Dec 24 16:22:09 2001, imserv1, <imserv@...> wrote:

>--- In CAD_CAM_EDM_DRO@y..., Bill Vance <ccq@x> wrote:
>>For the part, lets say that we want to do a round conical
>> version with a ramp that spirals around until it reaches the top.
>
>
>>You then put the point on that opposiite corner, and placing the pen
>on
>> the end of the first arc, continue around and around, drawing a
>spiral.
>>
>> Now for the questions. :-)
>>
>> can the xyz movements be programmed simultaneously; I.e., xyz
>starting
>> position, downward angle, arc point/ends, and arc direction all at
>once, for
>> each corner/arc, or would each move have to be individually
>
>Arcs require a planar definition. Normally you do not program 3 axis
>moves using arcs. This is primarily due to controller limitations
>and in many cases because the means to develop the program is not
>simple or cheap.

Would a versatile enough math util fed the appropriate equation(s) be able to
do it, and then convert the result to co-ordinate position data?

> You could use helical interpolation to develop the
>arc end points with a notmal X-Y value and a changing Z. There is a

What's a, "notmal x-y value"?

>gotcha here in that many controllers *really* slow down when using
>helical interpolation. It is used primarily for thread milling and
>hence the Z values are sometimes interpolated to an extra decimal or
>two. There may even be restrictions on maximum Z feed rates
>available when helical interpolating.
>
>However you will probably find that the Z axis in most machines is
>not as strong and swift as the X & Y axes, so that if you do 3 axes
>simultaneous contouring, you will be limited to the slowest one.
>
>It is usually more efficient and faster to program a series of
>waterline or planar rings (like defined with G17) with slight Z moves
>in between each. The Z distance will represent the resulting scallop
>height based on the size of your cutter and the problem becomes much
>easier to define, program and cut. (about 30 seconds with VectorCam
>to define and program).
>
>Best Regards, Fred Smith- IMService
>Listserve Special discounts and offers are at:
>http://209.69.202.197/cced.html

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