OK, i can't buy one so what are my other options. I started watching YouTube videos on homemade lathe duplicators. It seems that most of the ones I found either used a router or angle grinder to do the cutting. I kept asking myself why do they need a powered cutter when the lathe can provide the power and all I need to do is apply a cutting tip.
I had a couple of Easy Woodtools cutters for lathe tools I made for myself and figured I could use them to do the turning. All I need to do is determine how to mount and present the cutters to the workpiece and let the Shopsmith do the work.
This is what I came up with. This project may be presented over a couple of posts because there several pictures and explanations involved.
The first thing I did was to fabricate tool holders. Since I had the round and diamond cutters I made holders for them. I used 1/2" square stock and drilled and tapped holes to hold the cutters. I then used my grinder to profile the holders to match the cutter profiles and provided a relief angle under the cutter to clear the workpiece.
Next I needed to make a follower to follow a template. I cut a piece of hardwood stock 1" wide (arbitrary on my part) and shaped it to match the cutter.
Now I have a cutter and follower but I have to make a way to hold the tool and present it to the workpiece. I started with a plywood base that seemed to be about the right size. I then cut a piece of white oak I had laying around for the upright. I started by cutting it long because I wasn't sure what the final height should be yet. I routed a 1/2" x 1/2" groove through the top that fit my tool holder exactly. I cut a piece of scrap plywood to cover the top and added a threaded insert and know to hold the cutter in place. I cut a 1" mortice in the bottom of the upright to hold the back end of the follower and keep it centered. I then drilled a hold through the follower and plywood base, added a threaded insert into the plywood base to hold the front of the follower.
By this time I had already build the platform to fit the Shopsmith so I could set the final height and do the final assembly of the cutting head? (don't know exactly what to call it).
edit: I forgot to mention that I made the plywood base extend slightly beyond the cutter tip so the forces would transfer down to the table and not risk tipping. I also added the triangular blocks and attached the handles I had left over from a Porter Cable router base that I wasn't using.
To be continued in part 2.