On Friday 28 February 2014 15:55:57 Charles Steinkuehler did opine: > On 2/28/2014 12:49 PM, John Alexander Stewart wrote: > > Andy; > > > > I could be persuaded to have some sympathy for this viewpoint, > > actually. > > > >> If G-code simply moved axes in absolute machine space and everything > >> else was done in the pre-processor then thing would be a great deal > >> simpler. > > > > I wonder what will happen when they get *two* extruders going (support > > + final materials) and find that they have two slightly different > > heights of extruder nozzles - maybe re-invent tool offsets, but call > > it something different. > > Why re-invent tool offsets when you can simply use a different > coordinate space...it's not like they're useful for anything else:
Which is fine if the tool has an infinitely small cutter. The usual 60 degree V used as a PCB etcher approximates this fairly well. So I have only ever used it for tool LENGTH offsets found in real time by my autoz routines. Diameters are always in the first few lines of my gcode output, so I can change from a 0.250" tool to a 0.125" tool, edit one var in the file, and carve an identical part. Where I find the various co-ordinate systems useful is in doing double sided PCB's where I drill a needed hole about 60% of the boards thickness and they meet in the middle with no discernible offset ledge. As an ex B.I.L. was fond of saying "thats good enough for the girls I go with" ;-) > > http://reprap.org/wiki/Gcode#G10:_Head_Offset > > http://reprap.org/wiki/Gcode#T:_Select_Tool > > <sigh> 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> NOTICE: Will pay 100 USD for an HP-4815A defective but complete probe assembly. ------------------------------------------------------------------------------ Flow-based real-time traffic analytics software. Cisco certified tool. Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer Customize your own dashboards, set traffic alerts and generate reports. Network behavioral analysis & security monitoring. All-in-one tool. http://pubads.g.doubleclick.net/gampad/clk?id=126839071&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
