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
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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>
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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
>
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