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
> > > >
> > > >
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