Quote Originally Posted by irving2008 View Post
Its unlikely any retuning is necessary. A new spindle motor isnt going to be significantly heavier in the scheme of things than what you have (had?) and the issue, if there is one, won't be stepper performance, but gantry loading.
Irving there's a massive difference in weight between the rubbish he had and the WC spindles and the Z axis stepper on the 3040 is not very strong so it will affect tuning.
Expect having to drop the acceleration and possibly velocity.?

Also think about the mounting has the WC spindle is much longer and larger than the standard and will need a good mount making and possibly new back plate.?