Hi, I think you need to revert to imperial sizes and my guess is the ML10 leadscrew is 5/8" 0.625 inches so best to azure a 5/8? reamer !

John

PS where are yo located ? nothing on your profile !

From my days of owning a Myford ML10 this hole needs to be either bored or reamed 5/8" or 15.87mm, (15.90mm is top limit on a H7 hole). The finish left by a drill will hardly be good enough. There is also an Oilite bush present in the original Myford assembly for the threaded part of the leadscrew to rotate in. Remember the clutch continues to rotate when the leadscrew is disengaged, or stationary. Without the clutch the normal leadscrew rotates in two Oilite bushed pressed into the Bed. Thus the free end of the leadscrew needs some sort of bearing to support it, as the clutch body rotates. Steel on Mild steel is not a good mix without plenty of lubrication.

Regards

Gray,

Oilite bushes have a slightly oversize bore as supplied, when you press them in to the correct size hole the bush bore finishes up at correct size. I'd make a plug gauge, measuring small holes accurately isn't easy.