On 5 June 2017 at 02:22, <tom-...@bgp.nu> wrote: > Currently I do that by cutting a diameter with the threading tool. I > measure that with a micrometer and I enter the DRO value in the tool touch > off for that tool (I have a routine that leaves the tool at the diameter > after cutting so this works). But I am wondering, I don’t have a DIAMETER > value in the tool table for the tool. Should I? Is a zero (or > non-existant) radius value causing Linuxcnc to think the tool is longer > than it really is when cutting?
How do your numbers compare with line 502 of this spreadsheet? https://docs.google.com/spreadsheets/d/1m5zkO9-SbQaYWbTPlQXJ2VA73Ys8WgWDrPk_rEukHc0/edit?ts=57064122#gid=0 (This is a version of the table I complied 20 years or so ago, but modified to include the effects of crest and root flattening/rounding) The DXF file of the inserts shows a 0.05mm radius, whereas as the web-page table shows 0.06mm. In either case the tip is rounded, not flat. You might consider drawing the thread in CAD, with the exact profile for the thread and grade required, and then fit an exact drawing of the insert into it. That might answer the question of how to touch-off and what to. It is an interesting puzzle, and I am another who will admit to "creeping up" on one-off threads. -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." — George Fitch, Atlanta Constitution Newspaper, 1916 ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
