Quote Date: Sat, 4 Aug 2007 17:41:19 -0400
From: "Steve Stallings" <[EMAIL PROTECTED]>
Subject: Re: [Emc-users] G28 return to home
To: "Enhanced Machine Controller \(EMC\)"
<[email protected]>
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset="us-ascii"
>From the "CNC Programming Handbook" by Peter Smid (ISBN 0-8311-3158-6)
and basically describing Fanuc behavior....
G28 is NOT modal, the G28 must appear in each block where used
G28 in a block by itself is not valid, one or more axis parameters
must be supplied. Only those axes specified will move.
Traverse rate will be rapid, like in a G00.
The axis parameter must have a value specified (Fanuc behavior).
The value will obey the absolute or incremental mode currently
in effect!!!
The value is used as an intermediate way point on the path to
machine zero.
If no intermediate way point is desired, the value should be such
as to cause no motion away from the starting point. For example
while in absolute mode the value should repeat the current
position, or while in incremental mode the value should be zero.
You MUST know what mode you are in before using a G28 command.
The purpose of the intermediate way point is to avoid clamps etc.
End quote-------
I must add that a move:
G90 G28 Z0.
Will generate an alarm if Tool offset ( G43 ) is not cancelled with a
G49.
G91 G28 Z0. ( will ignor a tool offset )
I do not know if having a cutter comp ( G41 | G42 ) has any affect on a
G90 G28 X0. Y0.
move. I have stuck with using G91 mode exclusively since it seemed less
error (alarm) prone.
Also G91 G28 is always based on the G53 native coordinate set.
PGAB
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