On 3/17/2014 2:46 PM, Gene Heskett wrote: > On Monday 17 March 2014 17:23:05 David Bagby did opine: > > [snip] > > This is not anything that I have ever played with. Why? Because I do the > majority of my TLO's via a probing touch, and set the corresponding G55-56- > etc co-ordinate system. Not to quibble, but just FYI what you described is resetting the Work Coordinate Z0 location after measuring a tool. Moving Z0 is really setting a WC offset value for Z.
That's not the same as setting a TLO value and using G43 to get TLO compensation done in the control logic as MC moves are converted to MC moves. Both may end up doing what you want depending on how you run the machine, but they are two separate mechanisms. I've noticed over the years that I see guys with wood routers shift Z0 a lot - they have no clue or desire to know what TLO values or tool tables or H (or D) registers are or why they'd want to use them. The opposite tends to be true of mill users - trained machinists learned about TLO values and tool (D and H) compensation and don't get why anyone would think of shifting the WC offsets for Z instead. > With the lack of a precision tool length to my > morse tapered collet set, setting a tool length in the table is a total > waste of time even for collared tools, so I only set the tool radii or > diameter. > > There are quite a few ways to skin this cat in LinuxCNC, but marrying the > TLO setting of G43 into the tool table value just because you did a tool > change is not a universally good idea. If you want to use it, and have the > tool mounting precision to make it work, then put the G43 as the next > operation after loading the new tool, before lowering it to go back to > work. > > Now, if someone wants to play with the tool table, I can see a lot of > advantageous utility in making the tool pocket number into a string, like > ".250in end mill", "3mm end mill" or "5/16in drill" or "Num68 drill", > something along those lines. > > Cheers, Gene ------------------------------------------------------------------------------ Learn Graph Databases - Download FREE O'Reilly Book "Graph Databases" is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
