Hey Scott,
The only thing is that these spindles don't have the thermistor for overheat protection shutdown via the VFD, so you have to disable that in the VFD parameters or just jumper the SBHQ connections to bypass it. The cooling fan on these put out a lot more cooling air than the 80mm electric fan on the HSD's, so I'm not too concerned. Ran a 3.5 hour 3D yesterday and it was just a good warm temp when finished.
Scott
If guns kill people, I guess pencils misspell words, cars drive drunk and spoons make people fat.
"Those who hammer their guns into plows, will plow for those who do not" - Thomas Jefferson