On Monday 17 March 2014 20:24:55 David Bagby did opine: > 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.
True, but when you do not have the ability to remount that tool with ANY degree of repeatability, it seemed like the logical choice for me, and when etching a PCB, its work very well indeed. I can remove the copper without damaging the FR4 under it. > > 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. > Works fine, for those with repeatable tool mounting. > > 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 Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/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
