Thanks Stuart, right now, that sounds like villages in the desert to me, but I'll go into it.
me ... going to dive into lcnc documentation thanks Ju ________________________________ From: emc-developers-requ...@lists.sourceforge.net <emc-developers-requ...@lists.sourceforge.net> Sent: Saturday, May 8, 2021 8:19 AM To: emc-developers@lists.sourceforge.net <emc-developers@lists.sourceforge.net> Subject: Emc-developers Digest, Vol 181, Issue 7 Send Emc-developers mailing list submissions to emc-developers@lists.sourceforge.net To subscribe or unsubscribe via the World Wide Web, visit https://lists.sourceforge.net/lists/listinfo/emc-developers or, via email, send a message with subject or body 'help' to emc-developers-requ...@lists.sourceforge.net You can reach the person managing the list at emc-developers-ow...@lists.sourceforge.net When replying, please edit your Subject line so it is more specific than "Re: Contents of Emc-developers digest..." Today's Topics: 1. Re: 4th axis pivot point question (Stuart Stevenson) ---------------------------------------------------------------------- Message: 1 Date: Fri, 7 May 2021 21:52:42 -0500 From: Stuart Stevenson <stus...@gmail.com> To: EMC developers <emc-developers@lists.sourceforge.net> Subject: Re: [Emc-developers] 4th axis pivot point question Message-ID: <cahf93hrpamdpb19judkm6-17mfvverxpgfw9cvpcg07wp8e...@mail.gmail.com> Content-Type: text/plain; charset="UTF-8" Juergen, Are you talking about the display on the AXIS preview or are you talking about machine motion? If you are talking about the display on the screen I don't have much experience with that. If you are talking about machine motion then - You can modify your kinematics file to include a pivot length distance on the y axis/joint position to adjust for the pivot length you determine. sin B axis value times pivot length and cos B axis value times pivot length also You can modify your kinematics file to include a tool length from the tool table to adjust the y axis/joint position for the tool length. sin B axis value times tool length and cos B axis value times tool length also You can modify the kinematics and hal files to create a variable to be read from a hal file to allow you to adjust the pivot length value. You will also need to pass the tool length value into the kinematics file. You will then have 4 axis pivot and tool length compensation. Ideally, the program would position the XYZ tool tip and have a B axis value. The pivot length value and the tool length MUST add up to the distance from the tool tip to the pivot point. You can arbitrarily choose where the pivot point is measured from along the spindle/tool axis. Your tool length will have to be measured from the same point along the spindle tool axis. thanks Stuart On Fri, May 7, 2021 at 5:38 PM andy pugh <bodge...@gmail.com> wrote: > On Fri, 7 May 2021 at 16:43, Juergen Gnoss <jgn...@hotmail.com> wrote: > > Pivot point of the B axis is about 100mm above spindle collet. > > > > Do I need to tell LCNC something about that in configuration or hal, or > is > > that handled by tool offset in Z ? > > > > It's not really handled at all. > > The machine will do what the machine does, that is fixed by the mechanics. > > The graphical preview will assume that the B axis is along Y = 0. (because > it has no way to know any better) > > -- > 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-developers mailing list > Emc-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-developers > -- 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. ------------------------------ ------------------------------ Subject: Digest Footer _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers ------------------------------ End of Emc-developers Digest, Vol 181, Issue 7 ********************************************** _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers