It shouldn't matter. On a lathe using X and Z the symbols are I and K. On Tue, Jun 1, 2021 at 8:38 PM John Dammeyer <jo...@autoartisans.com> wrote:
> Hi Stuart, > > Did you mean I/J instead of I/K or does it matter? But thanks for the > info. I'll dig into that a bit deeper when I get a chance. > John > > > > -----Original Message----- > > From: Stuart Stevenson [mailto:stus...@gmail.com] > > Sent: June-01-21 6:02 PM > > To: Enhanced Machine Controller (EMC) > > Subject: Re: [Emc-users] Drilling feed rates. > > > > Gentlemen, > > My experience programming a Fanuc 5T control starting in 1979 taught me > the > > IK calculation was VERY critical. If the IK values caused the control > > calculated radius to be longer than the axis position commands the > control > > would choke on the G02/G03 line. The control would handle the xxx.xxxx > > format commands. If the IK values would yield xxx.xxxx1 (.0001 or more > > longer than the control calculated radius the axis positions calculated > it > > would error. I would always trig the value of the third leg using the > > radius I was programming and one of the I or K values to calculate the > > other I or K value. I would then use the calculated value without any > > rounding. Sometimes I would still get an error. I would then subtract > .0001 > > from the calculated leg and it always worked. That was my biggest hurdle > to > > programming the 5T control. Once I figured that out the rest was a > breeze. > > The one value at a time display was no help in figuring out the problem. > > I don't know if the LinuxCNC protocol is the same. > > HTH > > Stuart > > > > > > On Tue, Jun 1, 2021 at 11:18 AM John Dammeyer <jo...@autoartisans.com> > > wrote: > > > > > I haven't got a spindle encoder mounted yet nor switched to step/dir > for > > > it. Just PWM to 0V..10V from cheap far east module. Only goes down to > > > about 100 RPM. > > > > > > Looking forward to mounting encoder so I can try power tapping. > > > > > > This came with AlibreCAD 'Expert' subscription back in 2007. Looks > like > > > it's still available for download if one downloads a trial version of > > > BobCAD. > > > https://www.machinist-toolbox.com/ > > > > > > My plan at the software end was to eventually create something like > this > > > but written in Lazarus (Free Pascal) which means it would run on PCs > with > > > WIN or Linux and Macs (or even the Pi or Beagle with MachineKit). So > far > > > I've only written the hole boring utility for which I believe I used > Jon's > > > C code translated to Pascal. > > > > > > The only issue with this small app is that LinuxCNC chokes on the I/J > > > G-Code with radius not equal error. Haven't had a chance to look into > that > > > yet. The R approach does work. Either can be selected from the Options > > > menu. > > > > > > > > > > > > John Dammeyer > > > > > > > > > > -----Original Message----- > > > > From: andy pugh [mailto:bodge...@gmail.com] > > > > Sent: June-01-21 12:59 AM > > > > To: Enhanced Machine Controller (EMC) > > > > Subject: Re: [Emc-users] Drilling feed rates. > > > > > > > > On Tue, 1 Jun 2021 at 06:48, John Dammeyer < <mailto: > > > jo...@autoartisans.com> jo...@autoartisans.com> wrote: > > > > > > > > > However most of the online calculators for drilling call the load > per > > > flute as cutting feed in inches per revolution and don't take into > > > > account the number of teeth so their value is half the feed rate at > > > about 10 ipm. > > > > > > > > You can use feed-per-rev mode in LinuxCNC if you want. > > > > > > > > > > So where the Machinist-Toolbox software lets you specific the > number > > > of cutting edges (flutes) why don't the online ones do this? > > > > > > > > I used to use FSWizard online, and that took into account number of > > > > flutes (The online version no longer works, though) > > > > > > > > > > > > -- > > > > 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, 1912 > > > > > > > > > > > > _______________________________________________ > > > > Emc-users mailing list > > > > <mailto:Emc-users@lists.sourceforge.net> > > > Emc-users@lists.sourceforge.net > > > > <https://lists.sourceforge.net/lists/listinfo/emc-users> > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > _______________________________________________ > > > Emc-users mailing list > > > Emc-users@lists.sourceforge.net > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > > > > -- > > Addressee is the intended audience. > > If you are not the addressee then my consent is not given for you to read > > this email furthermore it is my wish you would close this without saving > or > > reading, and cease and desist from saving or opening my private > > correspondence. > > Thank you for honoring my wish. > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Addressee is the intended audience. If you are not the addressee then my consent is not given for you to read this email furthermore it is my wish you would close this without saving or reading, and cease and desist from saving or opening my private correspondence. Thank you for honoring my wish. _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
