I thought I’d post this for others using very small bits in the Nomad where run-out can be an issue. If you’re suffering frequent breakage this may be of interest.
I checked three 1/8" shank bits and found the run-out to be about 0.06 mm, a serious amount as I’m preparing to use a 0.127 mm bit. I also measured run-out of a bit in a high precision 1/4" collet and found that to be about 0.03 mm. I’ve ordered another, high precision, 1/8" collet but thought I’d see how much of the run-out might be in the spindle itself. I found the spindle run-out, as measured on the threads as well as the smooth area just above the threads, to be about 0.03 mm. This appears to explain the run-out with the higher precision collet (purported to be precise to 0.0002" = 0.005 mm).
I loosened the screw holding the spindle in place with the intent of applying a bit of torque to allign it. This turned out to be unnecessary, when I simply retigntened the screw the run-out was reduced to about 0.005 mm. Easy peasy except for the fact this screw is seriously torqued down, it was a little unnerving to loosen it.
I’ve yet to receive the new collet so have yet to comment on the efficacy of this adjustment but my dial indicator is liking it.