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  1. #1
    Join Date
    Jul 2009
    Posts
    419

    Returning home: How to end offsets in lincnc

    When you start the pc+mill, the first thing you do is home the thing, in my case that is manual, jogging to "about zero" visually and then click "home", I have no home - or end switches.

    After this work can begin.

    As a part of setting up the mill you have to create offsets.

    How can I end those offsets so I can return the mill home so I have no jogging to do the next time?

    I have read there are two kinds of "end offset" commands but the technical English lingo in the linux manual is just a bit to far beyond my grasp...
    Sven
    http://www.puresven.com/?q=building-cnc-router

  2. #2
    Join Date
    Jan 2005
    Posts
    1943
    I also have no limit or home switches. On most of my programs I have the following lines

    G53 G0 Z0
    G53 G0 X0 Y0

    The G53 tells it to use the machine coordinates instead of the part coordinates. Having these at the end of the program, or just running these in MDI mode will put the machine at the home position. Shut it off there and when you come back next time it is ready to have the home buttons set. It wkll also remember where the zero for the part is.

  3. #3
    Join Date
    Jun 2007
    Posts
    62
    Typing G53G0X0Y0Z0 will return you to the "home" that you set originally.

    G53 works in absolute mode, then the machine reverts to G5x whatever relative mode. The # key will flip between relative and absolute on the display.

    Hit Alt-H then R to get a panel with a lot of keyboard shortcuts, makes things much faster.

    Ed.

  4. #4
    Join Date
    Jul 2009
    Posts
    419
    Thanks guys, I'll give it a try next time!
    Sven
    http://www.puresven.com/?q=building-cnc-router

  5. #5
    Join Date
    Mar 2004
    Posts
    1661
    Guys, you need three dirt cheap micro switches and a few meters of cable. Make homing switches!

  6. #6
    Join Date
    Jan 2005
    Posts
    1943
    Quote Originally Posted by svenakela View Post
    Guys, you need three dirt cheap micro switches and a few meters of cable. Make homing switches!
    Said I didn't have them. Not that they weren't in the plan. I am currently in the process of building brackets for a new machine build which will incorporate them. I will be doing prox switches though.

  7. #7
    Join Date
    Mar 2004
    Posts
    1661
    Quote Originally Posted by 109jb View Post
    Said I didn't have them. Not that they weren't in the plan. I am currently in the process of building brackets for a new machine build which will incorporate them. I will be doing prox switches though.
    Good.
    Non-touch switches are much better. I have a repeatability of 0.01 mm with micro switches so they are good enough. Prox gives the same accuracy but without moving parts (that can be disturbed by dirt). A few dollars more, but worth it.

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