On Saturday 24 June 2017 15:46:04 Gene Heskett wrote: > On Saturday 24 June 2017 05:20:26 andy pugh wrote: > > On 24 June 2017 at 04:53, Gene Heskett <[email protected]> wrote: > > > But I've no specs that give tooth height or tip radius > > > profile, so the best I could do at composing a tooltype would be a > > > SWAG. > > > > The tool table doesn't do height anyway, but you should be able to > > set the included angle exactly to the correct 55 or 47.5 degrees. > > (or that silly 60 degree angle that the foreigners use :-) > > Uhh, Andy, as one of them foreigners, hadn't you noted that g76 for > instance, defaults to assuming a 59.5 to 60 degree included angle. At > least the instructions do. It's the folks with the Whitworth and such > bolts that are half a bubble off to the rest of us. ;-) > > > It might be useful to measure the tip radius and tooth height, just > > to know what thread the insert can manage. (in theory you could use > > the radius number to help touching-off, touch off to the notional > > perfectly-sharp dimension) > > Andy, I don't have a thing that could measure those angles, or the tip > radii which is pretty sharp. So I attacked the tool.tbl editor, > assigned a tip radius of 0.0025, and tried front and rear angles with > a 60 degree separation, then found the ORIENT figure does NOT turn the > tool image like it shows in the Documentation.pdf, but moves the > imaginary contact point around on the radius of the tip. IMNSHO, > thats a bug as it will force me to compose 8 tools just to match what > I see in the pdf's. And TBT, its fairly rare that the toolpost is > tightened down dead square. It may "look" square, but I wouldn't bet > on it being within 5 degrees to the axis's of the machine right now. > > So I adjusted that for the center of the radii. So now I had a true > 60 degree triangle. Next I played with a multiplier constant in the z > advance calculation until it would just touch one side of the tool, in > this case the advancing edge, and cut on the trailing edge as it went > deeper into the thread. So next (I'm inside feeding the missus ATM) I > go out and compose another tool image that is a mirror of this one and > check the exterior cutting as its all in the g33wrapper.ngc to do > either, with or without the taper. So back to the salt mine I guess. > > Cheers, Gene Heskett
And when I set bore=0.00000 which should have made it do external, a variable I had added so I had a proper exit diameter clearance as it moves away from the work, was not being set, so now I am trying to rearrange the code so all the vars are properly set regardless. But now I need to so something I've not tried before because the final, do the real work has a while[var lt var] format, so I need to be able to use a string substition variable in place of the lt above. Probably a gt. Is this possible? and if so, whats the format of the assignment statement? Thanks. 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> ------------------------------------------------------------------------------ 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
