01-18-2018, 02:57 AM
You could join the Acme rod in a number of ways.
The key technology in any methods is to sneak on the length of one of the members of the joint until the helixes line up.
I'd recommend this way: Tap a fine machine thread in each end of the piece. Make a piece of all-thread out of higher-strength alloy. The threads should be 1.5x diameter in depth, and the all-thread 3xD in length. It should be red loctite'd together, or it could be pinned together (I'd use mild steel pins)
I suppose you could make a half-lap and braze together. You remove 1/2 of the diameter of each part of the joint. On one part of the joint, you'd shave the length down .001" at a time until the helixes line up. Fixture, pin and braze.
The key technology in any methods is to sneak on the length of one of the members of the joint until the helixes line up.
I'd recommend this way: Tap a fine machine thread in each end of the piece. Make a piece of all-thread out of higher-strength alloy. The threads should be 1.5x diameter in depth, and the all-thread 3xD in length. It should be red loctite'd together, or it could be pinned together (I'd use mild steel pins)
I suppose you could make a half-lap and braze together. You remove 1/2 of the diameter of each part of the joint. On one part of the joint, you'd shave the length down .001" at a time until the helixes line up. Fixture, pin and braze.