Re: [CAD_CAM_EDM_DRO] thermal expansion

Greg Jackson wrote:

>There are quite a number of machines which run hollow columns and flood them
>with fluid. It can be pumped throughout the machine and controlled with a
>small thermostatic heater. An easy way to solve frame motion. Ball screw
>growth is different, but big machines will normally stretch them which
>reduces much of the thermal growth factor. I think you need a pretty beefy
>frame to provide any significant tension on the ball screw.
>
>

Some machines have hollow ball screws and run constant temperature
coolant through them to
prevent thermal changes. The same is often done with spindle assemblies
for thermal
control. These are clearly high-end machines.

Jon