I got a chance to run Jon's spiral progam. I did not note any problems... The motion was very smooth in all quadrants and all transitions. This is with BDI 2.12+. Les Leslie Watts L M Watts Furniture Tiger, Georgia USA http://www.alltel.net/~leswatts/wattsfurniturewp.html engineering page: http://www.alltel.net/~leswatts/shop.html