Cutting a metric 10x1 5mm thread with a mini lathe with an imperial leadscrew using the mini lathe gear change calculator.
Making lathe leadscrew. Flush with the surface of the block then slide the carriage down to aposition. Once that is done retract the half nut and shaft into the block so thehalf nut is. Mod my mini lathe making good the crap one i made before. I was not making anything in particular just trying to cut metric threads.
The big difference is the change gears for screw cutting are driven by a cog that. Time to replace my worn lead screw. Over the leadscrew end block at the tail of the lathe as in the nextphoto. Making a mini lathe carriage lock out of a brass block to improve facing cuts duration.
My bv20 lathe is not quite the same as a normal 9x20 lathe but has similar swing and between centre capabilities.