Re: Parabola via CNC?

Rich,

Are you looking for a way to cut a parabolic curve on a CNC? Since
you can generate coordinates on Excel, why not generate a whole bunch
of points on the curve then transfer those data points to an editor
(word processor) and format them according to your machine's Gcode
syntax? Basically all you need to do is connect the points using a
"G01" (linear) command. Note, the points have to be closely spaced
so the resulting cut appears to be smooth enough for your needs since
your actual profile will be made up of a whole lot of short line
segments. I've done this a few times with curves which I could only
represent mathematically and not graphically in CAD.

The method I described above is a good way to implement helical
interpolation on older machines. Generate points around a circular
path with a Z axis movement added and you're in business.

Another way to cut parabolic and other "odd" curves is with a CNC
controller that allows the input of the actual curve's equation. The
controller calculates it's target coordinates in real time as it's
cutting. Not super fast because the control has to do a bunch of
calculating. Most newer controllers support this type of programming.

Doug

--- In CAD_CAM_EDM_DRO@y..., cmsteam@a... wrote:
> Hi,
> Would some kind gentlemen please fill me in on the Cad programs that
> are capable of generating parabolic curves. I've scanned thru 3
thick
> books on Autocad with nary a mention. A web search only turned up
> EasyCad as a possibility.
> Of course the end result has to be convertable to g-code.
> Excel can generate the coordinates in a jiffy but, where to go from
> there?
> Rich