Need Help!- Machining a spline

[surfit]

I am programing an Impeller lathe blank prior to machining the blades on the 5 axis mill. The shroud contour is a spline and when I program it it posts out x/y moves instead of a curve. I have had this issue every time I try to machine a spline and what I do is make a series of five or more circles that match the spline then connect them. This is a very tedious way of doing it but I have had no sucess doing it any other way. Does anyone here know how to machine a spline that will post out as a curve?
Thanks

[CNCRim]

When come to spline/surface ..... CAM usually output line segment reason more efficent than arc .... machince won't slow down/jerky when try to cut more accurate that way. You can try make arc filter bigger see if it will output arc, I have a feeling the trouble is in the post itself.

I had played with arc filler couple times, but no luck beside I don't need to since we have 512MB hard drive(5years ago) more than enought for us to run any five axis jobs.

[surfit]

Originally Posted by CNCRim When come to spline/surface ..... CAM usually output line segment reason more efficent than arc .... machince won't slow down/jerky when try to cut more accurate that way. You can try make arc filter bigger see if it will output arc, I have a feeling the trouble is in the post itself. I had played with arc filler couple times, but no luck beside I don't need to since we have 512MB hard drive(5years ago) more than enought for us to run any five axis jobs.

The original spline was created from an excel spredsheet exported from a program called Accent with "Z" and "R" coordinants that I used to drive a spline thru. Now I have given up on using the spline and I have created arcs using a 3 point arc tool to create an arc between each of the spline points and checked it against the spline. the largest missmatch was around .0002" This was much faster and easier than the way I was doing it in the past.
I have Hatach seiki machines with fanuc controls and Gibbscam for programing niether of wich support turning up the resolution or machining a spline
Thanks for the input.