[QUOTE=JAZZCNC;54875]If your using R&P then chances are you'll have a high pitch so lack of speed won't be an issue even with steppers.
Steppers are a lot easier to setup and get working and they are much cheaper. They are just as accurate as Servo's if tuned correctly with far less hassles.

The Only reason I would consider going to the expense and complexitys of servo's is if the Gantry was heavy or I need very high speeds. Speeds well above 7.5Mtr min are very easily achived with steppers and depending on Gantry weight they most likely won't need to be 12NM either.!

What do you plan to cut at above 7.5mtrs/min.?[/QUOTE

the Gantry will be 101 KG all kit and attached, .
also in the Future if things go well I was expecting to increase the Length of the machine.
For the most part it will be cutting limestone and sandstone.

in the beginning I thought 1600oz steppers which comes around the 12NM mark direct drive
then
What I did was work out the HP/Watts I needed then added some extra to cover any eventual loss.
I thought to drive a Cutting head through the stone Extra Torque is needed. and so higher Watt which also means Faster machine,
Profi stone machines cut 300mm per minute cutting granite shapes and cutting straight lines with High head 6 metres per minute.
im looking for comparable speeds to use the machine in a working environment cutting limestone which is about 2/3s the force needed .

Steppers work out about a third of the price.
but continually seeing more favouring the Servo.