Backing off home switches in Mach 3 with soft limits?? Gerry??

[jbluetooth]

I'm going to try to make this short and to the point, since everything else on my machine is working great, homing works fine, limit switches work fine.

Is there a way to home a machine with soft limits turned on? I want to have my soft limits set an inch or so away from my limit switches as a buffer, but when homing, the soft limits are triggered. I read this post:
http://cnczone.com/forums/showthread...tton%28&page=3
which I thought would totally work, but it didn't. I added the code to my button script, and with the soft limits off, it works great and my machine homes, then returns to x0 y0, but with soft limits on, it starts homing and stops after it hits the switch and backs off and says soft limits exceeded.

any ideas? I've tried the following scripts:

DoButton( 24 )
DoButton( 23 )
DoButton( 22 )
DoButton( 25 )
Code "G1 G53 X0 Y0"

DoButton( 24 )
DoButton( 23 )
DoButton( 22 )
DoButton( 25 )
While IsMoving()
Wend
Code "G1 G53 X0 Y0"

DoButton( 24 )
DoButton( 23 )
DoButton( 22 )
DoButton( 25 )
While IsMoving()
Wend
Code "G0 G53 X0 Y0"

Again, if soft limits are off, all of these work, and the machine homes, then returns to 0, but with soft limits on, it stops after the first soft limit is reached.

Is there a code I can add to the beginning that will turn off the soft limits, then another code that will turn them back on at the end of homing?

Thanks
Jesse

[H.O]

Hmm, that's weird, I played around a bit here and on my system I can't even turn ON the softlimits before I've homed/referenced the machine. Anyway, you could try something like this:

If GetOEMLED(23) Then     'Check if Softlimits are ON
 DoOEMButton(1029)        'Toggle soflimits
End If
DoButton( 24 )
DoButton( 23 )
DoButton( 22 )
DoButton( 25 )
Code "G1 G53 X0 Y0"
While IsMoving()
Wend
If NOT GetOEMLED(23) Then     'Check if Softlimits are OFF
 DoOEMButton(1029)        'Toggle soflimits
End If

/Henrik.

[CarveOne]

I've not set this up before, but my understanding of this is that the soft limits should trip after passing through the home position. This is an over travel condition.

CarveOne

[ger21]

No, he wants the machine to stop before tripping the limit switches.

I don't have switches on my router to try it, but Henrik's code is what I was going to tell you.

[LeeWay]

You are probably aware of this, but I'll say it anyway. You can set the soft limits up right at you switches and have the soft limits implement a slow zone. This would effectively slow an axis way down before it actually hits a switch. I just assume that is why you want soft limits set before the switches.

[CarveOne]

Originally Posted by ger21 No, he wants the machine to stop before tripping the limit switches. I don't have switches on my router to try it, but Henrik's code is what I was going to tell you.

Ok. On my first machine I set up the ramps for the lever switches so that going past a switch then and backing up would not damage the switches. I know that there are many ways to do this.

CarveOne