2009/9/9 John Kasunich <[email protected]>: > Pitch is one thing, and feed is another, and never the twain shall meet.
The more I think about this, the more sense it is making to me. "F" controls the speed of travel in the direction of tool movement, whereas "K" sets the speed explicitly in the Z direction. Taking the example of the Fusee, you need a constant pitch in the Z direction, not in the direction of tool travel which might be significantly different on the steeper parts of the fusee. I can even conceive of the possibility of using K _and_ F along with variable spindle speed to have constant chip-size and surface speed whilst controlling the thread pitch :-) "F" could have been used for the lead in G33, but it would have been inconsistent with its meaning elsewhere (though this is not immediately obvious for conventional parallel threading operations) Incidentally, EMC appears not to be unique in this usage: http://pdf.directindustry.com/pdf/delectron/g-code-programming-manual/14577-33189-_23.html http://www.omni-turn.com/Media/Manual/G33%20threading.PDF However, the approach here: http://books.google.co.uk/books?id=i1cKWU9FBm4C&pg=PA84&lpg=PA84&dq=G33+threading+K&source=bl&ots=IlQv9IVzW2&sig=9qXwnEUHJ7aiFZhWdEDo1gmcR3o&hl=en&ei=ocOoStjbJOCfjAfC94XYBw&sa=X&oi=book_result&ct=result&resnum=2#v=onepage&q=G33%20threading%20K&f=false Might make some sense, this describes the use of I, J, K for explicit pitches in each cartesian direction, _or_ the use of F in the feed direction. If you wanted to turn a new scroll for your 3-jaw chuck you would need the option of an "I" pitch, or to support "F" in G33. -- atp ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
