Newbie PID advice on a retrofit BenchmanXT - Page 5


Page 5 of 5 FirstFirst ... 2345
Results 49 to 51 of 51

Thread: PID advice on a retrofit BenchmanXT

  1. #49
    Gold Member TomKerekes's Avatar
    Join Date
    May 2006
    Location
    USA
    Posts
    2149
    Downloads
    0
    Uploads
    0

    Default Re: PID advice on a retrofit BenchmanXT

    Hi Steve,

    Great. btw if you use the #CODE tag in cnczone then the code will be formatted/indented better and much nicer to read.

    Yes Kanalog has 8 3.3V LVTTL inputs and 8 3.3V LVTTL Outputs on JP12.

    The default settings for the GCode Interpreter can be set in the Tool Setup | Tool Setup Files | Setup File. There is an example called INCHES.SET. See here

    HTH
    Regards

    TK
    http://dynomotion.com


  2. #50
    Registered
    Join Date
    Aug 2012
    Location
    United States
    Posts
    29
    Downloads
    0
    Uploads
    0

    Default Re: PID advice on a retrofit BenchmanXT

    Tom,

    I've been busy but having enormous success and have cut quite a few parts with great precision. I'm still learning how to use this system but so far everything is running great and very stable. I have a continuing problem that I wanted to run by you. I can successfully run a "Home" routine that seeks and finds a switch on all three axis. I want to use that position to set movement limits on the axis. So once I command home for, as an example, the Y Axis. The axis moves backwards towards the column until it contacts the limit switch. my bed can travel maximum of 7 inches in the Y axis. So I want to let the machine know that from the limit switch contact, it can travel no further in that direction and only a maximum of 7 inches in the opposite direction. So if I command it either in the cutting program or by trying to move the bed with joystick or keyboard buttons, it will stop before reaching its limit.
    Thanks

    Steve



  3. #51
    Registered
    Join Date
    Jun 2004
    Location
    Scotland
    Posts
    204
    Downloads
    0
    Uploads
    0

    Default Re: PID advice on a retrofit BenchmanXT

    Steve, what you need to implement is soft limits.
    You'll need to work out the axis counts you want as limits, then set them for each axis, which you would normally do as part of the homing routine.

    To work out the limits, I personally watch the Axis screen within KMotion, and slowly jog the machine into the limit switch. Then add/subtract a suitable safety margin, and use those values to set the soft limits.
    You'll probably also want to implement the SoftLimits3Axes example file, so a feedhold gets implemented if you're going to run into a soft limit, as the basic soft limit implementation simply activates after the limit has been exceeded, which means the axis doesn't start decelerating until after the limit has been exceeded.



Page 5 of 5 FirstFirst ... 2345

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

PID advice on a retrofit BenchmanXT
PID advice on a retrofit BenchmanXT