No gears on the Mits machines. Direct coupled to the ballscrews.
The head likely will not drop with the 5mm pitch ballscrew. On machines with a 10mm pitch ballscrew, the heads can creep down when the power is switched off which generally indicates the gibs need to be snugged up. There is typically enough friction in the dovetail (when properly adjusted) to prevent the head from dropping so there is no servo brake on the Z axis of my machines.
Those colors on my machines are the ones used on all Dyna Mitsubishi machines: 4400, 4500, 4800, 3300 (lathe). There are numerous layers of primers underneath. As the coolant and chips have taken their toll over the years, there are areas where huge chunks of paint are flaking off. |