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[13:10:02] <archivist> mhaberler I just did a drawing to show the two part length to build up tooling length
http://www.archivist.info/cnc/tooling.svg one owns a set number of holders(upper) about 6 and about 50 cutters (lower) of all sizes if doing clock gear cutting to a large extent
[13:10:41] <archivist> and then its the centreline too
[13:10:53] <mhaberler> ah, now I understand
[13:11:19] <mhaberler> so that translates into a offset derived from toolholder and tool, and no touchoff required
[13:11:45] <archivist> yes if machine is nice and well zeroed
[13:12:09] <mhaberler> other than that, what would be the use?
[13:12:22] <archivist> touch off is a right pain on centred cutting
[13:13:22] <archivist> dunno if other applications would ever need
[13:14:18] <archivist> there is another offset needed which is diameter on that type of cutter
[13:14:25] <mhaberler> do I read this as: if tool x is using holder y, then set offsets to o.x+o.y?
[13:15:19] <archivist> yes I think that covers it
[13:15:29] <mhaberler> well, is that an offset? depends on cutting direction, so hard to build into offset; that would be crc I guess
[13:15:52] <mhaberler> ah, that's an interesting use case (actually even for me ;)
[13:16:58] <mhaberler> ok, I'll look into the tololholder thing; that looks straightforward
[13:18:20] <archivist> this shows the tool rotating
http://www.youtube.com/user/davethearchivist?feature=mhum#p/a/u/0/Jbp8SJ9RxqI
[13:18:36] <archivist> and as it happens the work too
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[13:24:32] <archivist> effective dia of the cutters change after sharpening
[13:24:58] <mhaberler> hm, wear fields or just fix diameter?
[13:25:40] <mhaberler> I'll do like so: every tool has a holder, which defaults to the zero-offset holder
[13:26:00] <mhaberler> other holders offsets are described in the holders table
[13:26:37] <mhaberler> so doing nothing defaults to tool offset only
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[13:39:57] <archivist> ok I think
[13:41:23] <archivist> reason for separate db (mysql/pg/whatever) is where tooling is shared and set up centrally and use can be recorded if needed
[13:41:54] <mhaberler> there's another reason - getting CAM stuff to use it, like HeeksCNC
[13:42:17] <archivist> good idea :)
[13:42:45] <mhaberler> that copying back-and-forth of tooltables always p...ed me off
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[13:43:36] <mhaberler> HeeksCNC needs a bit of an XML export for now but trivial
[13:44:42] <archivist> well, next is standard gcode and make this special version using size offsets from order id n in the database
[13:45:35] <mhaberler> explain
[13:46:39] <archivist> I think that is currently driven in the other direction, script reads order and creates gcode for job
[13:48:09] <archivist> when I cut gears I only have a few .ngc programs, I just change a few constants for specific qty of teeth and dia etc
[13:49:03] <mhaberler> I'm not into order processing... just working on tools
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[15:34:07] <mhaberler> archivist: which offset is changed by 'G10 L10 Set Tool Table' ...
[15:38:58] <archivist> mhaberler, some explanation here
http://wiki.linuxcnc.org/emcinfo.pl?CoordinateSystems
[15:40:25] <mhaberler> ok, if its the G43 tool offset (which I assume) then the holder de-facto introduces another offset added in
[15:43:38] <mhaberler> the holder offset probably warrants a name, and G10 L1x operations; plus a holder word for G10L1 when setting a TT entry
[15:45:54] <archivist> I think the docs need expanding
http://linuxcnc.org/docs/html/gcode_main.html#sec:G10-L10 as its not clear
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[15:48:40] <archivist> did I ever say I hate multiple coordinate systems :)
[15:49:08] <mhaberler> hey, indirection is a powerful tool, if only to confuse users
[15:49:38] <archivist> I happy with indirection in assembly!
[15:52:15] <mhaberler> in case you're interested, here's the current schema
http://static.mah.priv.at/public/schema.sql and a sample filling:
http://static.mah.priv.at/public/filldb.sql
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[15:57:44] <archivist> mhaberler, I wonder about structure to the description for other types of tooling, 16DP for a gear cutter, .020" wide for a slitting saw, 1mod 14deg pa for a metric gear milling cutter
[15:57:58] <archivist> taps too
[15:58:14] <archivist> no of starts and rh/lh
[15:59:59] <mhaberler> the database scheme is easily extended by extra fields - which will be happiliy ignored; the question really is: which ones are needed for execution, or improve something/add a feature
[16:00:58] <mhaberler> some of that is useful for instance for the HeeksCNC tooltable which has much more information than the emc one; easy to store in the emc table
[16:01:53] <mhaberler> eg tap: would you make execution of a tapping cycle dependent on some hypthetical tooltype property, and derive mm/rev from another field?
[16:02:01] <archivist> it does allow for expansion and easy interface to other systems :)
[16:02:18] <mhaberler> yes it does
[16:02:43] <archivist> possibly but material affects speeds and feeds too
[16:03:15] <mhaberler> actually, a good point - I'll make emc operate through views so extra fields dont affect operation
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[16:03:48] <archivist> no need for views, just select fields you know about in emc
[16:04:03] <archivist> select * is evil :)
[16:04:35] <mhaberler> then try to d an insert into a table which has had fields added which emc doesnt know about, and return to my opinion ;-)
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[16:05:23] <archivist> no not at all
[16:06:45] <archivist> I often add fields and insert while current code still does not know of the new fields, never used a view yet
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[20:53:40] <mhaberler> q: is a LGPL-licensed piece of software OK to include in EMC?
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[21:10:10] <jepler> mhaberler: In terms of what is OK to link with emc: LGPLv2.1, yes. LGPLv3, no.
[21:10:23] <mhaberler> thanks!
[21:11:07] <jepler> based on
http://fedoraproject.org/wiki/Licensing#GPL_Compatibility_Matrix and the knowledge that the most restrictive license in emc is GPLv2 only
[21:13:22] <jepler> er, maybe I misread that table and LGPLv3 is OK too
[21:13:36] <jepler> no, I read it right the first time
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