yo jonathan,

i was terrified of turning down an over sized shaft so i spent weeks looking for the right size, its being shipped as we speak

im gutted you didnt find a 150mm one, im convinced it would have been easy to stick double row A/C on the nose in a shallow housing,, ill find out as soon as my shaft turns up ill start doing a bit of turning

im not totaly convinced a double row A/C bearing will be tight enough for ally, the ones iv got dont feel like they have that much pre-load, i might end up stacking the two of them

4th axis... mmmm im thinking a 100mm rotary table with my 5th stepper melded to it

im not sure anything is off topic,, is it?