Let the fun begin !!! ???

**PAULRO** · 24-02-2015

i have 4 core 1.5mm sqrd. cy cable on order for the steppers, is there a recommended cable for the spindle?http://2.2KW WATER COOLED SPINDLE MO... OWNING | eBay.

**JAZZCNC** · 24-02-2015

Originally Posted by PAULRO

i have 4 core 1.5mm sqrd. cy cable on order for the steppers, is there a recommended cable for the spindle?http://2.2KW WATER COOLED SPINDLE MO... OWNING | eBay.

Same cable will work if you have ordered enough. Either don't use one of the cores or use the 4th core for an earth if you want. Personaly I don't bother with earth on spindle and just don't use 4th core.

**EddyCurrent** · 24-02-2015

While the cable you have would work, and many people use that I'm sure, if you look in the manuals for 2.2kw drives you will see that 2.5mm^2 is generally recommended.
Also I think it's a good idea to take an earth directly to the spindle because if you have a motor to earth fault a lot of current will flow, if you don't have an earth wire it could flow though the bearings finding a path to earth and this could ruin them. If you were selling these things commercially they would have to meet regulations which most likely also encompass manufacturers recommendations, but if it's for yoursefl then you have to decide how far you want to go.

**JAZZCNC** · 24-02-2015

Originally Posted by EddyCurrent

While the cable you have would work, and many people use that I'm sure, if you look in the manuals for 2.2kw drives you will see that 2.5mm^2 is generally recommended.
Also I think it's a good idea to take an earth directly to the spindle because if you have a motor to earth fault a lot of current will flow, if you don't have an earth wire it could flow though the bearings finding a path to earth and this could ruin them. If you were selling these things commercially they would have to meet regulations which most likely also encompass manufacturers recommendations, but if it's for yoursefl then you have to decide how far you want to go.

These spindles only pull at Max 8amps the VFD manual is recommending to cover all bases. 1.5m/2 will easily handle 8A or anything you throw at these spindles. I've embedded my spindle in aluminium many many times pulling many amps stalling the spindle and loading it to the max without any issues using 1.5m/2 cable.

The machine should be earthed and adding another earth could create an earth loop and potential problems, it's happened many times before. The VFD is earthed and the shielding should go to the VFD earth point and that is enough. IME.!!

**EddyCurrent** · 25-02-2015

Originally Posted by JAZZCNC

These spindles only pull at Max 8amps the VFD manual is recommending to cover all bases. 1.5m/2 will easily handle 8A or anything you throw at these spindles. I've embedded my spindle in aluminium many many times pulling many amps stalling the spindle and loading it to the max without any issues using 1.5m/2 cable.

The machine should be earthed and adding another earth could create an earth loop and potential problems, it's happened many times before. The VFD is earthed and the shielding should go to the VFD earth point and that is enough. IME.!!

Well fancy that, all you time served people out there, you wasted four years of your life, it seems you didn't need to know all that stuff after all.

**JAZZCNC** · 25-02-2015

Originally Posted by EddyCurrent

Well fancy that, all you time served people out there, you wasted four years of your life, it seems you didn't need to know all that stuff after all.

Keep your knickers on Eddy wasn't saying your wrong or questioning your knowledge I'm saying 1.5mm is fine with these spindles after fitting many of these spindles without any troubles at all.!!. . Which I can't say about those being earthed at the spindle because I've had a few and seen several instances of people doing this and having ground loop troubles.

Also 2.5mm doesn't even fit the spindle connector so I doubt they where designed to use 2.5mm.!

**PAULRO** · 26-02-2015

my Chinese spindle and vfd arrived today from Portsmouth.the coolant ports as can be seen had fittings previously fitted . i don't know if this is standard practice ( as in testing) or it's second hand spindle and passed on as new. if any one has a previous experience of this i would like to know before i go and contact the seller.
the VFD appears to be new and doesn't have any sings of previous use. Then again what do i know!! i had a read of
http://www.mycncuk.com/threads/5814-...HINESE+SPINDLE to try and get to grips with the set up procedure . i'm curious to know if the settings listed in a post by Shinobiwan ( post 6) are still applicable . they are 2 years old but would save some unnecessary manual reading.