Messages

901

General Mach Discussion / Re: limit switches/ estop?

« on: March 15, 2009, 08:35:45 PM »

Afer trying many different solutions for the false triggering such as placing
the capacitor across the ground and pin 11 or which ever you are using for
limits, etc. Nothing was working. I set debounce to astronomical (up to 25000)
levels with no help. I am a stubborn man! I once again I insisted on a parallel
port jack on the exterior of my enclosure, instead of the cable running from the
board and thru the wall (grommetted) as Dave suggested. Of course the enclosure
he suggested is also plastic where mine is aluminum. It was causing a ground
issue because the cables metal shield was touching the enclosure which is
grounded. Once I pulled off the cable and ran it directly to the computer
everything worked great. I need no debounce, no caps or additional resistors,
etc. Hoewever I do notice if I hook the limit switch shielding to the chassis
ground all starts acting up again, so for now it will remain disconnected. I
also notice the steppers got remarkably quiet once the ground issue stopped.
That is twice that my stubborness and insistence on that jack in the back of my
controller was necessary. 2 different cables and 2 entirely different problems.
But Oh what I have learned about software trying to make it all work.

902

General Mach Discussion / Re: limit switches/ estop?

« on: March 14, 2009, 10:44:15 PM »

I believe you are right, just havent had time to pursue it yet.

903

General Mach Discussion / Re: limit switches/ estop?

« on: March 14, 2009, 07:05:19 PM »

I have no idea how I would do that? It is an HCNC Pro board. The designer says this is rare and it doesnt look like it is a big problem on the forums. Though cnczone does have some reference to it. There seems to be 1 person using a different parallel port. I am running a laptop and it works fine at controlling the mill. I did see someone refer to setting the lpt1 to be SEP?

904

General Mach Discussion / Re: limit switches/ estop?

« on: March 14, 2009, 01:21:32 PM »

Installed the .1uF cap on the limit switch input and ground. It didnt seem to change anything until I set the debounce to 25000. Then it would run the gcode fine without interruption (maybe). I do notice that the higher the debounce the longer time til false triggering. Also it blew a stepper fuse while I was bumping the Z+ limit, though that didnt happen again.

905

General Mach Discussion / Re: limit switches/ estop?

« on: March 13, 2009, 07:05:27 PM »

I just received a email from the boards designer that a .1uF cap was ok though he said this was a rare issue with his users. It did happen but rarely. I did add some features to my enclosure like variable speed spindle control and such. This might cause some of the interference but it didnt have an effect when I pulled the fuse. I am trying for a zero debounce, correct? I did pick up the bigger caps, so I will know more tonight. The z axis is the only one I am dealling with at the moment, under "ports and pins" input, should all 3, Z++, Z-- & Z home be enabled? I would think so but I am not sure.

906

General Mach Discussion / Re: limit switches/ estop?

« on: March 13, 2009, 04:50:57 PM »

I am taking it you didnt see anything blatantly obvious that was incorrect in my xml? Wouldnt my xml keep changing with each setting change saved?

907

General Mach Discussion / Re: limit switches/ estop?

« on: March 13, 2009, 12:24:54 PM »

Today I tried the .01uF cap between pin 11 and ground on the t5 on driver board. It didnt seem to help until I set the debounce 100 or above, unfortunately no matter how high I set the debounce it would still falsely trigger. With the cap in place I did notice longer delays til the false trigger. I tried as high as 10000. That gave me 30-45 seconds or so that I could actually jog the steppers without a trigger. I have seperate fuses in my chassis for the spindle, steppers, driver board, acc etc. Today I first pulled the fuse to the variable speed spindle circuit. That didnt have an effect. Put that fues back in. Then I removed the fuse for the steppers and all worked fine software wise. The board was powered up just not the steppers. So I am getting closer, I think. Any ideas? Can I increase the value in that cap and expect better noise rejection? I notice you had originally suggested a value of .1uF. I will ask specifically of the boards designer if it will cause any issues. thanks

908

General Mach Discussion / Re: limit switches/ estop?

« on: March 12, 2009, 10:11:07 PM »

I just checked the HCNC pro forum and Dave Rigotti, the boards designer recommended using a .01uF cap across grnd to pin used. I got 3 different .01uF caps, is there a difference I should be aware of? The types are a metalized film capacitor, a polyester film capacitor or a ceramic disc capacitor. Is 1 better or more durable than the others? They are all .01uF

909

General Mach Discussion / Re: limit switches/ estop?

« on: March 12, 2009, 09:37:57 PM »

Did you see anything in my xml file?

910

General Mach Discussion / Re: limit switches/ estop?

« on: March 12, 2009, 09:01:04 PM »

And how would I use it? Would each input get a cap or just attach all grounds to 1 cap? Or some other way?