On Tuesday 20 January 2015 05:07:44 Viesturs Lācis did opine And Gene did reply: > 2015-01-20 10:32 GMT+02:00 MH <[email protected]>: > > Hello, > > > > I was wondering if anybody else than me uses tool heads with more > > than one tool with linuxcnc. > > > > I have been doing this for years now and using offsets added and > > subtracted to the axis motor-pos-cmd and motor-pos-fb pins in the hal > > layer. > > > > This is a picture of such a multi tool head for a carton samplemaker > > plotter. > > > > http://picpaste.com/b8c76581ae10a7c2870a704ca07c4764.jpg > > > > Would it be possible to add support to linuxcnc for coordinate > > systems that move the tool head when switching for one coordinate > > system to another? > > > > The CAD programs used with this type of machine usually program the > > machine as if the tools were all at the same position and use a tool > > change to switch between tools and coordinate systems. > > Is there any particular reason to reinvent the wheel and not to use > tool table and tool [length] offsets in X, Y and/or Z? > Because that is why there is G43 command and that is exactly why there > are dedicated cells in tool table to specify these offsets. > That way you can change the tool with M6 and apply tool offsets with > G43 (including its location offset along X, Y and Z). > > Viesturs
It looks like that might be useful the next time I need to carve tenons on the end of a stick of wood the next time I do a larger furniture project. I made an alu bar, 1"x2.5"x13", that bolts to the front of the z sled casting so it projects out to the left, and has a chicago tool die grinder with a 1/4" solid carbide router bit chucked. This hangs out over the left front of the table, and I have a jig that locates and holds the stick which hangs down the front of the cabinet this little mill is sitting on, and made almost 200 tenons with that jig, and carved the mortises with another jig. Well worth the effort in terms of precision fit. But I had to get creative with homing to make it all fit. Thank you, this IMO is a better explanation than is in the pdf's describing G43. Cheers, Gene Heskett -- "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> US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS ------------------------------------------------------------------------------ New Year. New Location. New Benefits. New Data Center in Ashburn, VA. GigeNET is offering a free month of service with a new server in Ashburn. Choose from 2 high performing configs, both with 100TB of bandwidth. Higher redundancy.Lower latency.Increased capacity.Completely compliant. http://p.sf.net/sfu/gigenet _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
