On 20 October 2011 00:30, Brian May <[email protected]> wrote: > I am confused on G43 and G54 for a lathe.
Me too, but mainly because I keep touching-off into "T" rather than "G54" and vice-versa by mistake. > I am confused on how G43 works with G54 for a lathe. I set all my tools on > the Z axis to the spindle nose (G54 Z is set at machine 0 or variable 5223 > is 0) Then I take tool 1 and place it at the end of the part and touch off > the Z axis G54 at 0. This sets my variable 5223 to lets say 1. From what I > though, That 1 would then be added to all my tool offsets to give me that > actual zero. So far everything is working and I make a part. Yes, that is right so far. > Then I add another tool and touch of the end of the tool to the spindle nose > and my Z for that tool is incorrect? It is located very similiar to the > other tools in location of Z, however the number in the tool offset is very > different and it does not go to the correct location.... The spindle nose is no longer 0 in G54, you moved it to the end of the work when you touched-off the Z in G54 above. If you are adding a new tool then you need to touch it off using "T" to make it agree with all the other tools. When you touch off the new tool into G54 (with, initially, 0 in the tool offsets) to the spindle nose you are saying "the spindle nose is now zero in G54, for all zero-length tools. This then makes all tools differ from the new tool in their G54 zero position by how much that new tool isn't actually zero length. (this will basically mess up your G54 until you put in an accurately measured tool, and G54 touch-off again) If you touch off the new tool into the tool table (with "T") to the spindle nose, but with G54 still set to the end of the workpiece, you are saying "this tool is so anti-long that with the saddle in the current position, the tool tip is at the end of that workpiece over there" and you will end up with a bad tool length offset. If you want to always touch-off new tools to the spindle, you can designate one of your other coordinate systems to always be the spindle nose, (G59.3 for example), and select that before touching-off new tools. (always using T) -- atp "Torque wrenches are for the obedience of fools and the guidance of wise men" ------------------------------------------------------------------------------ The demand for IT networking professionals continues to grow, and the demand for specialized networking skills is growing even more rapidly. Take a complimentary Learning@Ciosco Self-Assessment and learn about Cisco certifications, training, and career opportunities. http://p.sf.net/sfu/cisco-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
