Electronics for New Machine + Chinese Spindle + VFD

[JAZZCNC]

#1 No can't use it like you think but yes you can use latching E-stop if you have one.
The fact you asked this shows me you don't fully understand how this E-stop system works so I'll expalin by breaking the diagram down. (See Pic)

You'll see 24V+ (red wire) going to one side of the relay coil. The other side of the coil needs a path back to 0V for the relay to turn on and close it's contacts to turn things on.
So follow black wire #1 and you'll see it goes to first Contact of the relay. This contact is Open so the path back to 0v is broken and the relay can't turn on. So we need a way to provide temporary path to ground. This is where the Momentery Button comes in.
The Pink wire is connected 0V and runs to the NO Momentery switch which when pressed allows 0V to the other side of the Relay contact and provided the E-stop button is Latched on then the path is complete and the Relay turns ON and the Contact closes providing another Path to 0V.
Now when you release the Momentery button the relay stays latched ON using the new path until the path to 0V is broken again. IE Hitting OH Shite Button.

This means we created a Latching circuit so When you release the E-stop button the Machine can't just set off. The Momentery button is the safety and will only let the Relay Latch on again provided the E-stop button is Set. On more advanced systems you'd have all sorts of other safety checks, like door switches etc but the principle is the same.

#2 No you can use any fuse you like provided it's rated correctly.

#3 Something like this will be much better but call in and ask for relay with doide. Or Buy a diode from them and put across coils.
http://www.ebay.co.uk/itm/4PDT-POWER...IAAOSw-jhUB4V2

#4 Could share for homing has well using this setup but I wouldn't.!! If your happy to use Soft limts then forget Limits and just wire the Home switches direct to the BOB.
Limits are Nice, esp on small machine when first learning but on Med sized machine and with 3yrs experience then you'll be ok.

#5 Provided your total consumption isn't more than rated then you'll be fine.

#6 You'll be fine Typical relay pulls about 50 - 60Ma.