help with limit switches

Results 1 to 5 of 5

Thread: help with limit switches

  1. #1
    Registered
    Join Date
    Aug 2016
    Location
    United States
    Posts
    14
    Downloads
    0
    Uploads
    0

    Default help with limit switches

    I'm really stuck with this limit switch problem. I have a dm2800 converted over to mach 3. I set limit switches by moving axis until limit switch was activated backed it off where it wasn't activated and set my zero on all axis this way.When I move off all axis and then reference all they go pass a little and then to zero no problem. Then I load a program and run the first tool. All axis go back to zero no problem. When I go to run the next tool the y axis activates the limit switch. I've tried to keep the axis off of zero by putting -.05 in the Z axis and .05 in the X and Y axis but it will still activate the switch. It was doing it on z axis for awhile and now on y. I put a G49 at the end of the program in the same line as the G91 G28 Z0 line. When the machine reads the M6 line and I change the tool for tool 2 and push cycle start it jumps back up to the G91 G28 Z0 line and activates the Y limit switch. I'm really lost on this can anybody help.

    Similar Threads:


  2. #2
    Member 2ferrous's Avatar
    Join Date
    Jul 2010
    Location
    Canada
    Posts
    172
    Downloads
    0
    Uploads
    0

    Default Re: help with limit switches

    Sounds like something in your code...

    Can you post your program?

    Timothy

    Dyna Mechtronics DM4400, HAAS VF-0E, HAAS Mini Mill


  3. #3
    Registered
    Join Date
    Aug 2016
    Location
    United States
    Posts
    14
    Downloads
    0
    Uploads
    0

    Default Re: help with limit switches

    TimothyThanks for the reply. I got it straightened out. I put a G90 at the end of each tool. The thing I didn't understand was there is a G90 on the line with the workshift that should of taken care of canceling out the G91. I guess these machines all work the same but are all a little different in some ways. Thanks againMike



  4. #4
    Member 2ferrous's Avatar
    Join Date
    Jul 2010
    Location
    Canada
    Posts
    172
    Downloads
    0
    Uploads
    0

    Default Re: help with limit switches

    Why are you switching between G90 and G91 within the program?
    Usually the G91 is used for a sub routines to save coding space and time.
    But with today's CAM there should be no need for it.

    I never use G28 either....

    Dyna Mechtronics DM4400, HAAS VF-0E, HAAS Mini Mill


  5. #5
    Registered
    Join Date
    Aug 2016
    Location
    United States
    Posts
    14
    Downloads
    0
    Uploads
    0

    Default Re: help with limit switches

    You're using a g91 for a sub program? G91 is incremental positioning. I would use a m98 for a sub program. All the machines that I know of use a g91 g28 z0 and g28 x0 y0 for homing except maybe some older matsuuras that I think use a g53



Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  


About CNCzone.com

    We are the largest and most active discussion forum for manufacturing industry. The site is 100% free to join and use, so join today!

Follow us on


Our Brands

help with limit switches

help with limit switches