NordicCNC's build log

[JAZZCNC]

- 3kW ATC spindle & Ø100mm spindle bracket. The spindle alone weights about 19kg according to the supplier (RattmMotors).

The spindle with Mount + BT30 Collet chuck weighs 19.5Kg. Don't forget if you are using dust extraction then you will need to retract the dust hood to allow access for tool change. This will mean adding pneumatic actuators and solenoid valves along with brackets etc and the dust hood its self.!... The weight creeps up fast.

Your estimate of 45-50Kg is about right. You will need a brake on the Z-axis motor to stop it dropping when not under power and i'm pretty sure your 180w motor won't handle the weight of ATC spindle.