I’ve mentioned before that obtaining quality material is one of my biggest problems here in China. Well, a corollary to that is that when I do have material, it’s probably not in the easiest-to-use form. For the jackshaft, I used a drop from a piece of 416 stainless plate that had been hardened to Rc35.
Before starting the Jackshaft, you should re-bore the G-175 gear so it can be used to size the shaft and you should have completed the front bearing and cam retainer plate for the same reason. It's always easier to adjust an outside diameter than an inside one to obtain the proper fit.
With one end roughed down to 5/8″, and moved to a smaller collet for a more stable arrangement, I ready to start roughing the end with the long 0.25″ section. I chose to machine it this way so that when I flip the part to work on the other end, I can grip on the longest section.
Since I reamed my front bearing and cam retainer plate oversized, I’m turning this 0.500″ long section to 0.251″. This will also make a nice press fit on the S-2412 steel gear so I can turn the whole length the same diameter.
The finished jackshaft ready to have the gears pressed on.
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All material, including the CAD drawings, relating to the construction of the Hodgson Radial presented on this site is free to use any way you see fit. However, no guarantees are made regarding the accuracy or correctness of the material presented here.