2011/6/15 andy pugh <[email protected]>: > > I think that this would work, though the offset would need to be in > the direction at right-angles to the cam profile local to the point > being considered. > > Whereas this needs to be with the cam axis as the centre. > > Typically a cam profile is derived from a table of rotation angle and > lift (or so I understand) so the input data is in polar coordinates. > (well, probably cylindrical coordinates)
It does not matter, how the toolpath is expressed - in Decart's coordinates or in polar cordinates. And, if the required CAM profile is offset by the radius of the grinding wheel, then moving the center of grinding wheel along that line will produce the required profile. I think that it is just another case of tool radius compensation and offsetting part's contour for that purpose. But I agree, that the shape of the profile has to be defined before all this, and I don't really have an idea, how that should be done. I am just suggesting, how to produce g-code for that. That conversion from Decart to polar coordinates can easily be handled in a spreadsheet. Before that a small operation in text editor is needed - replace all axis letters with a "space+letterr+space", so that all that text can be broken into columns with a "space" as delimiter and then with formulas they can easily be converted, unnecessary columns removed. Viesturs ------------------------------------------------------------------------------ EditLive Enterprise is the world's most technically advanced content authoring tool. Experience the power of Track Changes, Inline Image Editing and ensure content is compliant with Accessibility Checking. http://p.sf.net/sfu/ephox-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
