Messages

11

General Mach Discussion / Re: Switches behave strangely

« on: August 08, 2011, 05:40:07 AM »

Hello again guys

Time to report:

Today I installed 0.047 uF ceramic disk capacitors on each of the switches pins - and it looks like it works ! :-)

Had a minor issue with the shared homing switches - when trying to home - the limit part of the switch was triggered- not allowing me to reference.

Since I tried this with the debounce interval at zero - I have tried some settings and I have found out that 200 on the debounce is holding perfectly - I can now home/ref and I did not get any interference at all.

Thanks heaps for your support and wisdom guys - it is very much appreciated.

Isaac

12

General Mach Discussion / Re: Switches behave strangely

« on: August 04, 2011, 06:56:01 PM »

Thanks for that.

So I understand I have ground to my system (I am using a desktop) and the interference I get is probably form the motors/power etc.

Will install the capacitors and see how it goes.

Cheers


Isaac

13

General Mach Discussion / Re: New to CNC, seeking sources

« on: August 03, 2011, 08:36:56 PM »

Hi TP

Thanks heaps for this.

As I already purchased Peter's book (still waiting) I guess this will do.

If I will find it too much for me - I will certainly go for this one.

Many thanks again

Isaac

14

General Mach Discussion / Re: Switches behave strangely

« on: August 03, 2011, 08:30:25 PM »

Thanks for the info NosmoKing :-)

It may sound silly but I need to clarify one thing:

My Hobby CNC BOB came with an American mains plug. Since I did not wish to have any issues - I hooked this plug and using it with an international adaptor.

My dumb question: Where (if at all) does the American plug take it's ground from ? Is it possible I have no ground on the socket ? If this is true - where does the BOB take it's ground from ?

Does the Parallel port of the PC transfer ground somehow ?

Cheers

Isaac

15

General Mach Discussion / Re: Switches behave strangely

« on: August 03, 2011, 07:59:20 AM »

Thanks heaps guys

I will go with the capacitors option for starters - easier then start rewiring all.

Hope this will solve this issue.

Cheers from down under

Isaac

16

General Mach Discussion / Re: Switches behave strangely

« on: August 02, 2011, 07:51:06 PM »

Hi Hood

Tried the debounce trick - and YES this must be an interference issue. Put initially 2000 as you suggested -had no more issues with the Y axis home even when shared with the Y- -.   (debounce at this point set to 250)

Then hooked all the limit switches - these are notorious    - had to raise the debounce over a 1000 and it still does that once in a while.

You said the debounce trick is not such a good idea - how would you fix the interference on pins 11 and 12 ?

Many thanks

Isaac

17

General Mach Discussion / Re: Switches behave strangely

« on: August 02, 2011, 07:48:48 AM »

Will do and report

Thanks

18

General Mach Discussion / Re: Switches behave strangely

« on: August 02, 2011, 06:54:26 AM »

The Y switch is doing this when trying to share the Home with the Y- - limit.  Testing the home switch was OK and it shows OK on the diagnostic page. (led on when pressed)

When trying the limit switches - all of them seems not to function properly since I get the error message. Testing them looks OK but we get this error when no switch is pressed and does not matter if we put high or low active.

We thought about the noise issue - so we have put the switches wires as far as we can from the high current ones. although we did put the switches wires under the PCB to shorten the distance to the connector - but I don't think this is bad idea.... unless it is :-)

I will try to play with it tomorrow See if I can get you some more info.

Many hanks again.

Isaac

19

General Mach Discussion / Re: Switches behave strangely

« on: August 02, 2011, 05:27:39 AM »

Hi Hood

I will do this tomorrow (it's kinda late and cold here  )


This XML shows only the HOME switches since this is the position where I was able to jog the axes and try to home them (X and Z seems to be good)

When I shared the X Home with the X-- limit - all was looking good.  The same goes for the Z Home and Z-- axis.  Only the Y axes is giving me troubles


All my limit switches are hooked in serial to pin 11 and aim to work for the X++ Y++ and Z++  (My Z axis is set to 00 at the top of the throw hence Z-- and about -30 mm down = Z++ - hope I did not confuse you because my head is already spinning..)

Tomorrow I will set everything up the way I intend to use it - perhaps you will see some faults there.


Cheers

Isaac

20

General Mach Discussion / Re: Switches behave strangely

« on: August 02, 2011, 04:53:15 AM »

Hi Hood

Thank you for your kind assistance.

All my switches are NC.

Attached is my XML file. This file was downloaded form HobbyCNC files section and was slightly modified to what I think is OK for me (but I am not ruling out any mistakes there)

As this board was built as a kit - I suspect possible soldering issues but I am not ruling out any option at this stage.

Hope you can help

Cheers


Isaac