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Author Topic: Soft Limits Confusion  (Read 3103 times)

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Soft Limits Confusion
« on: August 14, 2008, 11:55:10 PM »
A few days ago, I installed and hooked up my home/limit switches.  I have one set of switchs, wired in series, serving both functions.  So, it would be nice to turn on soft limits, but I am totally confused by the settings.  The top of the dialog indicates the settings are in "setup units".  WRF does that mean?  If I want to set the soft limits one inch from the hard limits set by the switches, what do I input for each setting?

Ray L.
Ray L.
Re: Soft Limits Confusion
« Reply #1 on: August 15, 2008, 12:11:05 AM »
Mill ? First, Home the X and Y. Should be lower left corner. All moves then will be POS direction.
Then JOG to the opposite ends of the axis's to where you want the soft limits to be,(1" shy of the limit). Enter these dro #'s in the soft limits boxes for each axis (Soft Max). Also enter 1.000" at the Homed ends of travel (Soft Min).
Setup Units are your Native units...Inch or Metric.
Same for Z. Speed and Slow zone are pretty well self explanatory.
« Last Edit: August 15, 2008, 01:16:18 AM by Overloaded »
Re: Soft Limits Confusion
« Reply #2 on: August 15, 2008, 12:50:39 AM »

    Seems so simple when you explain it like that!  I'll set it up tomorrow.  Thanks! 

Ray L.
Ray L.

Offline Hood

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Re: Soft Limits Confusion
« Reply #3 on: August 15, 2008, 02:31:00 AM »
I would advise against setting the Soft Min X and Y and softMax Z to anything other than 0. The reason for this is twofold, firstly evey time you home you will need to turn Off the SoftLimits or it will be outwith the softlimits when you home. Secondly there is no real reason to do so. When you home a machine it moves to the limit and then backs off so that the limit is closed again and this is your machine coords zero. If you set the soft min to zero then the softlimits will stop your machine before it hits the switch. Obviously if you are doing a full rapid then it would hit the switch as the motors would not have time to deccelerate, that is why you set up a slow zone. The distance you set for the slow zone will depend on each ndividual machine as each machine has different accelleration/decceleration. Once a slow zone is set then when you kog or move towards an axis it will start to slow down but will continue until the SoftMin is reached and you will not be able to go any further.

 also your Soft Max for S should be sero and Soft Min for Z will be the travel of the Z axis but in a negative number fo for instance if there is 6 inch travel Soft Max will be zero and SoftMin will be -6.
« Last Edit: August 15, 2008, 02:34:35 AM by Hood »