Pete.
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- Kent, UK
A 1mm pitch will be in synch with a 3mm leadscrew every turn (of the leadscrew) so wherever you engage the half nuts will be OK - still points to something related to the threading indicator giving a problem with the 1,25mm pitch IMHO.
That is correct and it applies to ANY pitch that is achieved by dividing the leadscrew pitch by a whole number.
So for a 3mm pitch screw:
3/1=3mm
3/2=1.5mm
3/3=1mm
3/4=0.75mm
3/5=0.6mm
3/6=0.5mm
etc...
All of those can be engaged anywhere and will always synchronise.