Wooden Screw

I'm using a thread box and tap to make a wooden screw for a leg vice.

It's a 1-1/2 maple dowel that I soaked in mineral oil for many days.

  

When cutting, I use coconut oil which helps the chips clear. 

When tapping, it's critical and you need to go forward and back to clear chips. 

The hole is 1-3/8.  After I threaded it, I cut the nut out. 

I should have flattened it before drilling to ensure the hole was square to the nut.  A bit of sawing & planing got it close enough to use for the leg vise to replace the pipe clamp one I'm using here.