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Manufacture of Designs

GDS can create files directly for a CNC machine input from your design, for the inner rotor, outer rotor, inlet port and outlet port profiles.

The files are text based and can be created as X/Y centreline co-ordinates, X/Y offset co-ordinates (for a specified tool size), G-Code format, or (for porting only) a pocket milling routine. They are designed to be cut and paste (or imported as a sub-routine) into an existing CNC program file. They should be treated as the profile co-ordinates only because they do not contain information regarding cutter speeds, feed rates etc. Instructions within the output files specify the units, cutter size (if applicable) and start / end points for the profiles.

The number of co-ordinate points for the profiles will be the same as those used in the calculation processes within GDS, meaning the steps between each point are small, improving accuracy. These are:

  • Inner rotor: 3600 points
  • Outer rotor: Up to 325 points per lobe
  • Porting: Dependant upon porting size, approximately every 0.5° rotation. Generally >1000 points

The number of decimal places for each co-ordinate point can be defined (to align with the machine tool requirements). Also a cutter size can be defined, to enable the creation of a machine tool path, rather than a centreline path.

The files will be created using the same units as used for the design process (mm or inch). In the case of the porting files there will be seperate routines to correctly machine the upper and lower housing ports (if double sided or shadow porting is selected) so as to align correctly when the pump is assembled.

Gerotors can of course be manufactured by using the CAD solid models produced by GDS (see CAD Modelling page). However, not all of the models are as high a resolution as these CNC files (due to limitations of the CAD software system) and so this may reduce the quality of the parts manufactured directly from the solid model. Details regarding CAD model resolution are shown below:

CAD File System Inner Rotor Outer Rotor (# of points dependant upon lobes & fillet radii)

Inlet Port (# of points
dependant upon port size)

Outlet Port (# of points dependant upon port size)
GDS CNC Output File 3600 points Maximum Maximum Maximum
GDS DXF Output File 3600 points Maximum Maximum Maximum
GDS STEP File 3600 points Maximum Maximum Maximum
SOLIDWORKS models 3600 points 0.5 x Maximum Maximum Maximum
Solid Edge models

3600 points unless adjacent points closer than 9 microns

Up to maximum unless adjacent points closer than 1 micron Up to maximum unless adjacent points closer than 1 micron Up to maximum unless adjacent points closer than 1 micron
AutoCAD models 3600 points Created as cylinders, not point profile Maximum Maximum
Autodesk Inventor models 3600 points Maximum 0.5 x Maximum 0.5 x Maximum
Catia V5 models 3600 points 0.5 x Maximum Maximum Maximum
PTC Creo models Under development Under development Under development Under development

 


 

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