The Shumatech DRO-350 just uses the same technique for circles as for squares. Move only in X direction to each edge to determine the mid-point. Then do the same for the Y axis only. Yes, it's 4 points instead of 3 for a circle but realistically is easier to understand even if it's not as clever.
I have yet to get the HOME Z and HOME XY buttons I put onto the pyvcp panel working. Once I get back to that adding the probe stuff shouldn't be that hard. I really don't understand why that doesn't already exist in AXIS. > -----Original Message----- > From: R C [mailto:cjv...@gmail.com] > Sent: July-11-21 11:25 PM > To: emc-users@lists.sourceforge.net > Subject: Re: [Emc-users] 'automatically' go halfway between 2 points > > correct, > > If you draw 2, different, triangles like that, with their corners on a > circle, their hypotenuses intersect in the center of that circle. also > the middle of these hypotenuses, of each triangle, would be the center, > hence, that is why I was interested in finding� the "half way point" of > 2 points, coordinates. > > > on a mill it would actually be pretty easy.� touch off on a 'reasonable' > spot at the edge of a 'circle� (30-60 degree XY axis or so). > > Go down/up the X-direction until you find the edge again. From there go > in the Y direction til you find the edge yet again. The center (of that > circle/hole) will be half way� between where you "touched off" and where > you are now. > > for a rectangle, similarly you could center the X axis,� and next the Y > axis (and find the center of a piece of stock for example). Technically > you would have found the center of a concentric circle,� but that's the > same thing. > > > > It would be a cool utility,� that you can find all kinds of "spots" on a > part with, I'd be interested in 'building' something like that > > > Ron > > > On 7/11/21 11:52 PM, John Dammeyer wrote: > > Here are your 3 points. As a math wiz you can see that if you draw a > > perpendicular line from each pair of points they all intersect in > the middle. > > > > The third angle is the one I can create graphically and from that the > > length for the XY of the center but you might be able to explain > the math a bit better. > > > > > > > >> -----Original Message----- > >> From: R C [mailto:cjv...@gmail.com] > >> Sent: July-11-21 10:31 PM > >> To: emc-users@lists.sourceforge.net > >> Subject: Re: [Emc-users] 'automatically' go halfway between 2 points > >> > >> > >> On 7/11/21 11:15 PM, John Dammeyer wrote: > >>> Essentially the process involves two touch off operations. First one > >>> side until an LED comes on or even better the probe input > goes > >> active. At that point touch off so the axis is set to 0. > >>> Then you move in the opposite direction until the probe (or LED) goes > >>> active. Divide that axis value by two and move back to > that > >> position. Now touch off again to set the axis to 0. You are now in the > >> middle. > >> > >> Right,? I can do that with a calculator and some arithmetic, and jog > >> there manually,? but I am a mathematician,? and we're known to be lazy,? > >> so I am thinking about a button?? :) > >> > >> > >>> It's probably possible with a fancy G-Code macro. > >> well,? if one can write a plugin,? it would probably be fairly easy (but > >> I am a CNC rookie) to do that,? if that plugin can actually move the > >> tool/spindle > >> > >> > >>> A number of different projects I've done have been set up that way. Find > >>> the center of the object which is also where I've set > the > >> center in the CAM software. Rather than top left or bottom left corner of > >> something that has been milled away. > >> > >> right,? I don't think it is not too difficult to find the center of all > >> kinds of shapes (geometrically or otherwise), in a math kinda way that is. > >> > >> > >>> But I'm an amateur and probably do things the hard way. Often... > >> well,? hobbyist that's trying to learn some stuff here,? I am actually a > >> mathematician,? I can calculate things,? but I'd be a starving machinist > >> or CNC person/operator/machinist ...?? this weekend I created 4 proto > >> types of a stepper motor mount,? aka scrap. > >>> John > >> Ron > >> > >> > >>>> -----Original Message----- > >>>> From: R C [ <mailto:cjv...@gmail.com> mailto:cjv...@gmail.com] > >>>> Sent: July-11-21 10:00 PM > >>>> To: <mailto:emc-users@lists.sourceforge.net> > >>>> emc-users@lists.sourceforge.net > >>>> Subject: Re: [Emc-users] 'automatically' go halfway between 2 points > >>>> > >>>> > >>>> On 7/11/21 10:47 PM, John Dammeyer wrote: > >>>>> I still have my Shumatech DRO on my mill. I touch one side and zero > >>>>> the axis. I then move across and jog until the LED goes > on. > >>>> Then FCN 1 and the axis letter button. At that point the axis changes > >>>> to minus halfway between where I just touched off and > the > >>>> original 0 point. > >>>>> I move to make the DRO show 0 and then touch off that axis on the AXIS > >>>>> screen. Now I have the center point between the > two > >>>> edges. Since the LED indicator probe is 0.2" diameter the distance to > >>>> the center doesn't matter. Only if I am trying to find the > >> edge > >>>> and the Shumatech can be told the diameter of the probe. > >>>>> Certainly there must be an easy way to do this with LCNC? The > >>>>> Shumatech software has been around for at least 13 years. > >>>> Oops,?? I didn't see this last line...?? I think so,??? either some > >>>> added functionality in the DRO? (that is where I was looking around),? > >>>> or else a plugin.?? it's probably not that hard,? if I knew how to write > >>>> a plugin for LCNC > >>>> > >>>> > >>>>> John > >>>>> > >>>>> > >>>>>> -----Original Message----- > >>>>>> From: R C [ <mailto:cjv...@gmail.com> mailto:cjv...@gmail.com] > >>>>>> Sent: July-11-21 9:29 PM > >>>>>> To: linuxcnc-users-list > >>>>>> Subject: [Emc-users] 'automatically' go halfway between 2 points > >>>>>> > >>>>>> Hello, > >>>>>> > >>>>>> > >>>>>> in linuxcnc,? is there an easy/automated way to get halfway between two > >>>>>> points??? (Fort example, you'd touch off somewhere, move to some > >>>>>> coordinate (x, y)? (or even (x, y, z)) and go inbetween right to the > >>>>>> the > >>>>>> middle of where you touched off and where the spindle is now? > >>>>>> > >>>>>> > >>>>>> thanks, > >>>>>> > >>>>>> > >>>>>> Ron > >>>>>> > >>>>>> > >>>>>> > >>>>>> _______________________________________________ > >>>>>> 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 > >>>>> <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 > >>>> <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 > >>> <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 > >> <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 > > _______________________________________________ > 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
