Sphere parameters described

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The parametric data for the Sphere1 parametric follows. Data entry for the other sphere parametrics is similar.

*****SPHERE3 PARAMETRIC*****

Sphere Radius

Filament Band Width

Polar end opening radius

Number of band sets

Number of points per circuit

Spherical clearance radius

End shaft clearance radius

The Sphere radius and polar end opening define the winding geometry. The polar end opening is at both ends and the inner edge of the fibre band for the lowest wind angle should just touch the opening diameter. The highest wind angle is 90 degrees and this is a single band around the equator. A number of winding angles (layers) are created equal to the number of bands sets with constant changes in wind angle between the highest and lowest angles layers described above. Each program is a separate standard axisymmetric program with the number of cycles required to complete the layer automatically calculated. The wind angles, numbers of bands in the layer and the name of the particular PAY file are tabulated on the screen when the Sphere program is invoked. If the basic thickness of a filament band was say 0.18mm and a composite 4mm thick is required then 4/(2*0.18)=11.1 layers are required and the number of band sets would be specified as 11. In practice the actual thickness of the part will var

Each winding program has a number of data points on it and this is the number of points per circuit. A value of 20 works well in most applications. This is a compromise between accuracy and the amount of data created.

The spherical clearance radius and end shaft clearance radius define a control surface on which the payout points will lie. This consists of a sphere intersected with a cylinder, the cylinder being bigger than the mandrel shafts(s) and the sphere being bigger than the mandrel (plus the thickness of the winding). Thus the values supplied must be bigger than the shaft and mandrel radii.

When post processing the payout data from the sphere program the user should note that the band pattern has automatically been calculated in producing the payout file data.