I use this in my pillar drill and as long as you start from the center of the blank it doesn't matter too much if it goes slightly off center, unless you are doing a Celtic knot that is..
This is the jig I made for cutting the blanks, about 1/8" longer than the tubes to allow trimming them
And this is what I use when I am doing the Celtic knot to cut everything at the angle I want and at the same place :mrgreen:
All done from scraps and apart from a few screws, cost nowt..
If you aren't familiar with what a Celtic knot looks like here is one in walnut and box. Sorry if I'm teaching egg sucking here