@ Arnak
The column is true. Checked by simply raising and lowering the head with a dti and ground precision right angle block. Using both sides of the block I detected an error ~0.5 thou - better than I expected. I could change the column to to correct for this but then the spindle rotation would no longer be at perpendicular to the bed.
@RusselT
>> If I understand correctly you are talking about lowering the quill using the side handle and finding that it's motion is not parallel to the axis of rotation.
That's a much better way of describing it. The mechanics are good, smooth operation, no noticeable play, smooth movement. Locking the quill makes no difference but does introduce a side offset of a thou or two max.
In the past I've bodged it by packing the mill vice at an angle when I needed truly vertical holes, which to be fair is not that often. But its one of those things that keeps on niggling at me over time and I think I need to sort it as its become really irritating. Its a good little mill otherwise, perhaps a bit underpowered, and could always do with more travel.
If no other info is forthcoming on the madmodder forum I will get in touch with Warco, though it is well out of date for warranty purposes ~ 6years old.
Many Thanks
Best Regards
picclock