Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: peterm on November 21, 2011, 01:50:37 AM

Title: Limit/Home Switch setup question
Post by: peterm on November 21, 2011, 01:50:37 AM

Been trying to setup my limit switches but to no avail. I finally got my machine to respond and got the servos running but now comes challenge number 2....
So, I go through ports and pins to inputs and then try to do auto detect. I tried pins 10,11,12,13 and then press on the switch but nothing. I then reverse the wires go through the same steps and same result... I am using a chinese TB-6550 board and according to the manuals I am wiring it right.
So, what I am missing?  Do I have set anything else up in MAch3?

Thanks in advance!!

Title: Re: Limit/Home Switch setup question
Post by: Tweakie.CNC on November 21, 2011, 02:33:48 AM

So what was the problem that prevented your motors from running please ??  http://www.machsupport.com/forum/index.php/topic,20078.0.html
Servo's or Stepper's ??
Also it would be most helpful, for others that follow, if you could post the solution that you found in the earlier thread.

Thanks,

Tweakie.

Title: Re: Limit/Home Switch setup question
Post by: peterm on November 21, 2011, 03:24:59 PM

Quote from: Tweakie.CNC on November 21, 2011, 02:33:48 AM

So what was the problem that prevented your motors from running please ??  http://www.machsupport.com/forum/index.php/topic,20078.0.html
Servo's or Stepper's ??
Also it would be most helpful, for others that follow, if you could post the solution that you found in the earlier thread.

Thanks,

Tweakie.

Thanks Tweakie! Posted!

Any tips on this problem with limit switches?

Title: Re: Limit/Home Switch setup question
Post by: Hood on November 21, 2011, 05:01:06 PM

What kind of switches do you have (Normally Open, Normally Closed) How do you have them wired?
Can you also attach your xml.
Hood

Title: Re: Limit/Home Switch setup question
Post by: peterm on November 21, 2011, 05:39:25 PM

I have them Normally Closed. The NC wire going to the input on the board and the other wire going to ground.

Title: Re: Limit/Home Switch setup question
Post by: fixittt on November 21, 2011, 05:51:18 PM

which pin is it going to?  If you touch the pin # wire to the ground bypassing the switch altogether do you get a response?

Title: Re: Limit/Home Switch setup question
Post by: peterm on November 21, 2011, 07:08:30 PM

Quote from: fixittt on November 21, 2011, 05:51:18 PM

which pin is it going to?  If you touch the pin # wire to the ground bypassing the switch altogether do you get a response?

No response at all...

Title: Re: Limit/Home Switch setup question
Post by: peterm on November 22, 2011, 02:09:39 AM

I made some progress today. I set pin 10 to Y Home Switch using the normally closed option on the switch. it only works after I disconnect the ground and touch it to the ground again. But then the switch is on. I keep changing the settings around on MAch3 but getting confused is what I'm getting!
Does anyone know how to set the options in Mach3 to use "normally closed" on the switch?

Thanks

Title: Re: Limit/Home Switch setup question
Post by: fixittt on November 22, 2011, 10:22:35 AM

work with pins 11, 12, 13 and 15

Title: Re: Limit/Home Switch setup question
Post by: fixittt on November 22, 2011, 10:24:57 AM

start by using the HOME switch setting, this way you can visually see them on the mach 3 screen.  Wire them up......  If the switch it wired up and the home led comes on for that axis without pressing the switch, then change the active low setting for that switch.  Led should light up when the switch is triggered.

Home and limit switches can all be on the same pin number

Title: Re: Limit/Home Switch setup question
Post by: crazy council on November 25, 2011, 04:48:37 AM

Hi

I have been working on this with my friends setup.   

Firstly, as the post says above, same pins as your x,y,z, ( on his 11,12,13 )

Secondly, ( important ) make sure your direction of travel for that axis is set up the right way,  If its reversed in ports and pins, reverse it in home/limits setting.  ( if not it will try run off the end of the table still )

And finally, ( our problem was this ),   cheep Chinese cables absorb interference better than my children absorb cash ( and that takes some beating ) .    So make sure your cables are clear of your power and spindle cables ect.