Desktop size steel welded router 3 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.

[JAZZCNC]

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.

You got me bambozzled now and Not quite sure what your asking for but here's quick diagram showing 2 options. Option #2 is probably your best option.

[cropwell]

Hi Jazz,

Here's a question for you - If you are using one switch for home and limit does Mach ignore the limit function while homing?

That leads on to another - If you have slaved motors on an axis does mach wind both motors until a home trips and then keeps winding the untripped screw until the other trips, thus squaring the gantry and then do the backing off the home switch to complete the homing and aligning process ? In which case I presume you would need to have separate inputs for each side of the machine.

I see the point of having 2 targets and one switch, I only recently realised that Mach took into account which axis was travelling and the direction of travel when homing. It makes sense of commoning inputs.

Cheers,

Rob

[JAZZCNC]

Here's a question for you - If you are using one switch for home and limit does Mach ignore the limit function while homing?

Yes if you turn off HomeSW Safety in General Config.

That leads on to another - If you have slaved motors on an axis does mach wind both motors until a home trips and then keeps winding the untripped screw until the other trips, thus squaring the gantry and then do the backing off the home switch to complete the homing and aligning process ? In which case I presume you would need to have separate inputs for each side of the machine.

When using slaved motors Mach De-couples each motor turning back into two separate axis while homing happens which means the motors work independantly but move together in sync towards the home switches. When first switch is tripped that axis motor stops and backs off the switch while the other keeps going then does the same.
In practise provided your Gantry is square and the switches positioned correctly this appears to happen has one action. If your gantry is really out of square then you can position the switches to force it square.
When Both Motors have homed then Mach Couples the Axis again back into one slaved axis.

This does mean that the Slaved Motor needs it's own Home switch on a Separate Input.

[Tom J]

Machining base for X -rails


Had to bend frame in the places to be perfectly straight - left those Irwin for overnight to see if 0.8 mm sag is dissapering