Re: Rambling hydraulic post that was: Multiple syncronized spindle question.

[Dave Engvall <dengvall-at-charter.net>]

On 10/1/02 10:54 AM, "Jon Elson" <elson-at-pico-systems.com> wrote:

> 
> Dave Engvall wrote:
> 
>> Hi list:
>> Not that I've done this but controlling the temp of the  oil might help.
>> In this case one might have to warm to start with and then cool to maintain
>> but control to 0.1 C is pretty easy in a well stirred bath and you can get
>> two more orders of magnitude with out breaking the bank.
> 
> All the high-end (read $100,000 plus) machines do this.  The entire spindle
> head assembly is immersed in a temperature-controlled oil bath.  Some
> circulate
> and cool the oil, some circulate water coolant in pipes in the head.  But,
> thermal
> spindle growth is a major concern, and gets worse as the machines get larger.
> Some extra-high end machines also have hollow ballscrews, and run coolant
> through the screws to prevent expansion of them.
> 
> Jon

Jon, 
When I posted I was thinking of controlling the hydraulic oil temp to
minimize retuning; a bit more basic than temp comp for the spindle, etc.

dave

> 
>