Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: airbrush on May 17, 2016, 11:53:22 AM

Title: Do you use Soft Limits if you have limit switches on your machine? advantages??
Post by: airbrush on May 17, 2016, 11:53:22 AM

Do you use Soft Limits if you have limit switches on your machine?

advantages/disadvantages of enabling soft limits??

Title: Re: Do you use Soft Limits if you have limit switches on your machine? advantages??
Post by: Davek0974 on May 17, 2016, 01:18:48 PM

Yes i use both.

The limits are never hit in normal use as they cause a reset condition.

The soft limits are set 2mm before the limits so the machine slows and stops just short.

With the soft-limits set right it is practically impossible to hit a limit switch :)

Title: Re: Do you use Soft Limits if you have limit switches on your machine? advantages??
Post by: airbrush on May 17, 2016, 01:25:29 PM

Okay...my next question would be...

As a hypothetical example, lets say you're cutting something and for whatever reason(misjudged cutting area etc) it would want to cut past your limits....when it comes to your soft limits....does it cause a reset condition or does it continue to run the code? start cutting again when it comes back past your soft limit again?

Title: Re: Do you use Soft Limits if you have limit switches on your machine? advantages??
Post by: airbrush on May 17, 2016, 01:28:50 PM

so basically i would ref all home to reset my machine co-ordinates, enabled my soft limits...

newbie here...lots of question

Title: Re: Do you use Soft Limits if you have limit switches on your machine? advantages??
Post by: Davek0974 on May 17, 2016, 01:53:02 PM

If you have soft limits set, working, and turned on, when you press cycle start on a code file that wants to go outside your limits, you get a "Soft limit Warning on X / Y / Z" message, you can then OK the message or cancel and fix it.

The first thing upon starting up is a ref-all function or the machine has no idea where it really is.

Title: Re: Do you use Soft Limits if you have limit switches on your machine? advantages??
Post by: airbrush on May 17, 2016, 01:55:54 PM

i'm confused..."oath message"?

so it performs the same function as the machine hitting your limit switch then?

Title: Re: Do you use Soft Limits if you have limit switches on your machine? advantages??
Post by: Davek0974 on May 17, 2016, 02:07:10 PM

Blasted autocorrect ;)

OK the message

Not quite - it stops the motion BUT it does not cause a reset condition so you can jog away again.

Title: Re: Do you use Soft Limits if you have limit switches on your machine? advantages??
Post by: airbrush on May 17, 2016, 02:11:01 PM

i see...okay....so it serves the same purpose but it may save you having to reset your machine if you hit limit switches without soft limits enabled.

Title: Re: Do you use Soft Limits if you have limit switches on your machine? advantages??
Post by: Davek0974 on May 17, 2016, 02:23:57 PM

Yep, you won't hit the limits if soft limits are set up properly