Jari has made an enclosure around our cnc-mill, and that allows us to use a liberal amount of flood coolant. Here's a short video with some tests in aluminium.
Before you run to the shop and get an Opti-BF20 of your own please remember that our machine is seriously modified. We put a new table on it with linear guides, we're using ballscrews, and the stock spindle and spindle motor are replaced.
How much is there left of the original machine at all?
How did you mount the linear slides to the base?
These pictures will give you an idea of how the rails are mounted to the base
http://www.anderswallin.net/2007/04/opti-bf20-on-rails/
The base and the column is pretty much everything that is left of the original machine 😉
There are some more pictures and discussion about our machine on cnczone:
http://www.cnczone.com/forums/showthread.php?t=40018