Quote Originally Posted by Wobblybootie View Post
I can see the hangups with over complications but as for the extra weight I would have thought in a way that could be a plus point after all weight = mass and mass is good ... right??
not when you have to accelerate it... inertia plays a part.. however there are 2 sides to the story...

If this was the X-axis the motor has been added to the gantry mass, but since we are not having to accelerate the inertia of a big screw, just the nut the motor can be smaller. Since on bigger machines the inertia of the large screw rather than the gantry is often the overriding factor in deciding motor torque there may be net benefit in terms of a smaller motor requirement.