[Bwana Don]

We by-bassed ours a couple years ago and NO loss of accuracy. Circle interpolated holes are still nice and round.

[Techman]

I bypassed ours when the machine was only about a year old. Accuracy loss is zip. My Machinery Handbook lists the linear expansion per unit length per degree F. for steel as .00000633 at 68 deg. F. In other words, a 10.0 inch move at a 5 deg increase in temperature would be 10.0003
I don't know if you could run the machine hard enough to raise the screw temperature 5 degrees. Bottom line- bypass the coolant line and sleep well.