Why I used a Serial Switch Approach In Wiring My CNC Limit Switches

There are two choices when wiring control limit micro-switches these are:

1. Switches In Serial
2. Switches In Parallel

In my design I decided to implement a switches in serial approach and permanently on.  The reason for this is that I wanted the limit condition to be activated in the case that either of the two axis switches were triggered or in the case of the cable being broken.

As each of the items is in series any effect anywhere in the circuit will cause a limit condition.

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Why Use Permanently On With My CNC Micro Switches

I decided to use Permanently On With My CNC Micro Switches as it seemed to me the safest and the most reliable option.

In the Permanently On state a 'Limit Action' will occur in the control board logic if:

1. Switch 1 is activated by its End-Stop
2. Switch 2  is activated by its End-Stop
3. If continuity of any part of the switch cable circuit it broken

This is a fail safe operation and is my preferred option.

Cable or switch breakage can occur at any time especially when dealing with 'High Torque' and/or High Speed comments.  If damage begins to occur I want the machine to stop.

It's also the simplest of routings and connections to do and least likely to cause a short circuit damaging the expensive tools or controller circuitry.

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Wiring Up Limit Switches On A CNC 3020T Engraving Router

This video is about Wiring Up Limit Switches On A CNC 3020T Engraving Router, to ensure that they are working efficiently in the X, Y and Z axis.



 Here is a link to the type of Mini CNC Machine I bought on eBay

The Type Of Mini CNC I Bought On eBay

and a separate link to the CNC Limit Micro Switches I am using.

CNC Limit End-Stop Switches

If you have a CNC machine and haven't to end-stop or limit switches on it I'd advise you do so, it will save you burning out the gears if it over travels due to software glitch.

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Installing Z-axis End-Stop Limit Switches On My Mini-CNC 3020 Engraving ...

Part 1 of the Z-Axis limit switches video completed, just the wiring to do.



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Installing Y-axis Limit Switches On My Mini-CNC 3020 Engraving Router P...

In this second part of the Y-axis video, I show how I build and place the moveable Y-Axis Limit End-Stops on the 3020T CNC Router. The Next video will be the tricky Z-Axis, but I think I have a cunning plan ;-)

I Think Google Are Getting A Bit Picky With Their Website Analysis

What do you think, scores like this in any other endeavour would be seen as stunning, or cheating LOL

But Google have flagged up the site in their test for being in need of fixing.

And on another page they say my images are too big and need reducing, saying I can achieve a staggering 48% and 40% reduction with quite a bit of work...  Sounds worth it till you consider that they are talking about a meagre 26K and minute 1.9K reduction in size. Even with an old copper wire connection that would be a few seconds, if that, and with 30meg optical I can't even measure it.  

Somebody is a little OCD in their analysis me thinks.

LOL you can't make it up.