I needed a machine that would give me the ability to make a specialized part for my motorized bike project. The part connects a 5/16" x 24 thread output stud to a 3/8" dia. driveshaft. It couldn't be found anywhere, so I needed to make it. I just happened to have an old craftsman tool with the right configuration to solve my problem, with some alterations and a mini lathe chuck I was able to build what I needed. The lathe chuck was the perfect addition to this machine because of it's ability to hold round stock or flat bar stock in perfect 90 deg. alignment with the drill chuck. This machine can now be used for boring, tapping inside threads and with threading dies for male threads. It can be powered by any drill for boring operations or operated manually for tapping and threading.
The first step for this retrofit was to build and secure a mounting plate with a large pass through hole for long stock and four position holes that mate with long set screws attached to the back of the chuck. The lathe chuck simply drops into the position holes. I also flipped the beam over and where the original drill head attached, the top end of the shaft has been squared to accept a 1/4" socket extension.
Here we can see the pass through hole and the ends of the upright rods that have been extended down 1/2" to mate with holes in my workbench plank. This adjustment holds the machine in place when force is applied.
In this picture we can see the machine completely assembled and setup for a drilling operation. The round stock mounted in the chuck is going to be center bored and threaded. When completed it will become a specialized coupler.