The M12 x 1.5 tap arrived today. It's a machine tap, so was happy to do a full thread in one pass (no second or plug) in the lathe. They both came out nicely:
Fits the leadscrew nicely:
LH handwheel fitted.
RH / powerfeed end:
All works as hoped. There's now negligible backlash. It's quite a change from the massive backlash with the old leadscrew. Will take some getting used to. The Y axis is now "backwards", as the original leadscrew has a LH thread. I'm sure I'll get used to that quickly enough.
Drill block:
Now that the new leadscrews are up and running I can place the holes for the drill block. Drilled all the holes out 10.0mm and then opened the various holes out with the drills themselves. Then deburred, belt sanded and deburred the surfaces and edges. I am awaiting the 16mm drill chuck (with BT30 taper) which will allow me to drill out the final hole.
The end holes on the front row are for the small and large countersinks:
There.
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