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From: Bob La Londe <none@none.com99>
Newsgroups: rec.crafts.metalworking
Subject: Re: Yet Another New Machine
Date: Wed, 6 Nov 2024 10:39:06 -0700
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On 11/6/2024 10:16 AM, Bob La Londe wrote:
> On another machine for tool changes it would just STOP.  On that one I 
> modified my post processor insert a machine coordinate Z height move 
> that brought Z to zero leaving room for the tool change.

Machine coordinate zero.  Not work offset coordinate zero.  On a 3 (or 
more) axis milling machine machine coordinate Z zero (G53) is typically 
at the furthest distance from the table.  While work offset coordinate Z 
zero (G54,55,etc) is usually set at the top of the stock and sometimes 
at the bottom of the stock.

G53,54, 55 etc tells the machine which work coordinates it is working 
in.  G53 is does not affect following commands.  G54, 55, 56 is 
persistent.

Again there may be machine specific limitations.

Most people work with just G54 set, but G54 might be zeroed at the 
corner of one vise, and G55 might be zeroed at the corner of the next 
vise.  G53 is always relative to the machine.

G54
[CODE BLOCK]

G55
[CODE BLOCK]

G54 (good practice to set machine back to the default work offset if the 
secondary offset "may" not apply)
G0 (Set movement to maximum on some machines.  There are some syntax 
variations)
G53 Z0 F1000

I know this is all more than you asked, but other people may read it who 
might not pick up on important distinctions without it explained.


-- 
Bob La Londe
CNC Molds N Stuff

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