Giant 20' x 3' x 2' router build

[Clive S]

What's the thinking behind putting the VFD on the gantry as you can't change the speed etc. when cutting. ..Clive

[Jonathan]

What's the thinking behind putting the VFD on the gantry as you can't change the peed etc. when cutting. ..Clive

He could be using the serial interface to set the speed, but either way it will be subjected to significant vibration from the machine, which is asking for trouble.

[charlieuk]

I have been advised that having a long lead to the spindle is a bad idea because of interference generated the vfd its is mounted floating on foam to dampen any vibrations, the speed will be controlled through mach3

[EddyCurrent]

It's true that problems arise with long motor cables but the manual for my 2.2kW vfd says it's okay up to 50m long before you need to add output chokes. Also it recommends that for minimum radio interference the motor cable screen should be connected to ground at both ends.

[charlieuk]

It's true that problems arise with long motor cables but the manual for my 2.2kW vfd says it's okay up to 50m long before you need to add chokes. Also it recommends that for minimum radio interference the motor cable screen should be connected to ground at both ends.

cool well i will see what its like when its up and running and decide from there, if there is a lot of vibrations still than i can easily move it, i think i could get it down to about 10-12 meters minimum but thats about it.

is there any suppliers for the cable you guys can recommend? is the stuff on ebay ok or should i go else were?
many thanks

[Clive S]

cool well i will see what its like when its up and running and decide from there, if there is a lot of vibrations still than i can easily move it, i think i could get it down to about 10-12 meters minimum but thats about it.

is there any suppliers for the cable you guys can recommend? is the stuff on ebay ok or should i go else were?
many thanks

How about this:- http://quickbit.co.uk/cable/CY-cable...ble-1mm-4-core
I would earth the screen at both ends. Just search for CY cable. ..Clive

[charlieuk]

Cheers does the quality of cable vary much is there anything to look out for? the link you posted looks good. many thanks