Desktop size steel welded router 3 axis

[Tom J]

Jazz, other side is reserved for cable carrier, so switch(es) has to be near the motor. Did you noticed that bed frame has slightly more room opposite the motor (just enough for radius/bend of my cable carrier

I always was using two sensors - Limit and Home with Mach3 - connected similar to that:

can you explain how to use one switch (NC)? Wiring diagram would be ideal:)
I know how to daisychained together - but this is limit side, how to wire them to use Home?
Each black signal wire to input X,Y and Z?

[JAZZCNC]

can you explain how to use one switch (NC)? Wiring diagram would be ideal:)
I know how to daisychained together - but this is limit side, how to wire them to use Home?
Each black signal wire to input X,Y and Z?

Ok well maybe we are at odd's here.? It looked like 2 switches for Limits and I was meaning just have one switch that traveled.

But call it option #1 if your wanting to Share one Switch for Limits and Home then you can do that but with NC switches each Axis will need a Input. So 3x switches and 3 x Inputs.
Option #2 You can use NO switches then you can have all Limits and Homes on 1 input and wire them in parallel. So 3 x switches and 1x input.

What you lose with the later is the Safety of NC switch but you have more inputs to play with if limited.

Other option #3 uses 2 inputs and 2 types of switch. NC wired in series for limits on one input. NO wired in parallel for Homes on other input.
This gives Safest option because Limits can be set to be monitored while Homing.

#1 Shared Home and Limit on 1 Input with NC Switch is easy. Just wire each Axis switch to a Input. Then in Mach3 ports&pins Inputs set the limits and home input for that Axis to same Pin number. Set Both to go Active Low. Then go into General config and Turnoff(uncheck) HomeSW safety and thats it.
Now when Mach homes it ignores Limits.

#2 Setup for NO is just the same but All Axis share same pin number for Limits and Home. Then set to go Active High. Rest is just the same.

#3 Should be obvious really.!! Limits in Input 1 set active Low. Homes in Input 2 set Active High. Then turn ON Home SW Safety.

Can do a diagram if you let me know which you prefer.

[Tom J]

Ok. Jazz
I know what you mean by using one sensor:

So far I use 2 sensors, one is limit +, other is Home and limit- all in one, connected like that:

I think this is your option#3 " uses 2 inputs and 2 types of switch. NC wired in series for limits on one input. NO wired in parallel for Homes on other input"
I was wonder how you get away with having only one sensor, must use soft limits in Mach for safety. I've seen 3 sensors solution: limit+ limit- and home in one axis, but I think is not needed.
Correct me pls. if we I am wrong.

[JAZZCNC]

I think this is your option#3 " uses 2 inputs and 2 types of switch. NC wired in series for limits on one input. NO wired in parallel for Homes on other input"

Well kind of but your way is a bit mixed up because the (+) Limit is NC but the (-) limit along with Home are NO so doesn't have the safety on the (-) limit side if wire breaks.!

If you used all limits with NC wired in series on one input and homes with NO wired in parallel then you'll be safer.

I was wonder how you get away with having only one sensor, must use soft limits in Mach for safety. I've seen 3 sensors solution: limit+ limit- and home in one axis, but I think is not needed.
Correct me pls. if we I am wrong.

No Softlimits are optional and not required you still have Limit switch safety.
Maybe what your not realising is that Mach only Watches Limit Inputs when working and ONLY watches Home Inputs When Homing and Ignores Limits while doing so. It also by default Moves one axis at a time so only looking for one Input to change state. If all set to same Pin # then any will do for mach.

This is why you can share one input for ALL axis homes & limits provided they use NO switches. Mach doesn't know or care which Switch triggered it just responds to the trip.
So if cutting it see's this trip and knows it's a Limit so E-stops.
If it's homing then it knows the Axis it's moving and when see's Home Input change state it sets the Home position for that Axis. Then moves onto next Axis and does the same. It doesn't care which switch tripped so in practice you can actually set say the X axis Home by triggering the Z or Y axis switch.!

The ONLY time it won't work is if you have changed the HOMING sequence so 2 or more Axis home at same time. In this case you need separate Home inputs for each axis.

[Tom J]

This is why you can share one input for ALL axis homes & limits provided they use NO switches. Mach doesn't know or care which Switch triggered it just responds to the trip.

Got it, but not quite to the end. How than having NO switch will provide safety on the limit side if wire breaks?

[JAZZCNC]

Got it, but not quite to the end. How than having NO switch will provide safety on the limit side if wire breaks?

You can't have continuity safety with NO switches which I did say this in other post.

[Tom J]

Summarize, if I use TB6550 or similar BOB which has only 5 inputs: 1-X, 2-Y,3-Z,4-Limit/E-stop,5-GND than 3 switches used as home/limits detect the ground signal (NC-active low). Mach knows that this axis is in home position.
How should I wire if I use the same switch as Limit? Can not wire the same switch to pin 4 (limit/E-stop)
Using pin 4 will collide with homing (all switches will be in parallel - remaining two will have NC contact therefore no homing)
Jazz, could you please send the wiring - loosing plot.