On Mon, Jun 18, 2007 at 07:02:06PM +0000, Chris Morley wrote: > > > I was wondering how the spindle sync works, roughly anyways.
The index is used to start the threading pass; during the pass the spindle position is constantly read from the encoder, which is scaled into turns (one rotation = 1.0). The moving axis/axes is/are commanded to follow this position using "electronic gearing" at the commanded ratio. Changing the spindle speed doesn't hurt anything; I changed the spindle speed override while rigid tapping on the Mazak at workshop. This approach makes it unnecessary to have a perfectly constant speed spindle, since the motion tracks it. On my little lathe, the spindle definitely slows down while it's cutting. This doesn't hurt anything and it still makes excellent threads. (Many people at the workshop seemed surprised by this). Chris ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
