On Sun, Nov 9, 2008 at 10:11 PM, Chris Radek <[EMAIL PROTECTED]> wrote:
> More about lathe diameter mode on the Fanuc 0-TC (I found the
> manual):
>
> In diameter mode:
>
>    X specifies a diameter
>
>    U specifies an incremental diameter (not relevant in EMC)
>
>    coordinate system setting is done in diameter (like our
>    G10L2 and G92?)
>
>    X tool offsets can be in radius or diameter depending on setup
>    (I think they don't have anything like G10L1)
>
>    for arc R format, R is a radius
>
>    for arc IK format, I,K are radius values and always incremental
>    from the start point
>
>    feed rates are delta radius/revolution or delta radius/minute even
>    if the feed is along X
>
>    in canned cycles, X/U are diameter but some other things, like the
>    amount of taper on a tapered thread, are radius
>
> Note that I don't know if this control did everything the
> normal/common way or the way that's still common today.  I thought it
> might help you anyway to know what it says.
>
>
>
> So I can think of a few unanswered questions:
>
>    John K is adding absolute arc center mode - what is the I in that
>    case if using diameter programming?

in my experience the I J K values are "radius" - the I value for an
outside corner radius would be the desired radius + the tool nose
radius regardless of the programming mode

>
>    Are X repeats in canned cycles radius or diameter?  Like
>    G17 G91 G85 R0 Z-1 X.005 L10  (I bore like this all the time)
>

per the current mode

>    Are I,J,K in G76 (offsets from the drive line and depth) radius or
>    diameter?

radius

>
>    Is K in G33 (distance per rev) still radius if motion is along X?
>    (Pretty sure it should be)
>

radius

>    Are diameters or radii written to the var file for offsets?
>    What about the tool change location that is read from the
>    ini file?
>

per mode (an argument for the 'mode' to be in ini file setting)

>    how much tweaking is required for the AXIS preview, display of
>    machine extents, length and time estimates on the properties
>    screen, etc?
>

have no idea (the 'ini' setting would determine the calculations)

>
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just my thoughts
Stuart

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