i just got done adressing this, what i did was deep seat one of the set screws so it acts like a shear pin: with the sprocket in the final position take the tap drill and drill through one of the set screw holes .100 deep into the shaft. then insert a longer set screw in the hole and tighten down. the screw will act like a key and prevent the shaft from turning. note: i did not use the 8mm keyed shaft called for, i just used a peice of 5/16 stainless steel with a flat filed in for the set screws and the sprocket screw deep seated.

Parts came back from plating today They came out exactly how i wanted, matte black, well worth the $70 The J6 bearing cap was hiding in the tumbler and escaped plating, it will have to wait for the batch of parts being machined to go out now to get the races out of the printed parts little bummed they had to be destroyed to get the races out, body saw made quick work out of the plastic. all my bearings ended up a slip fit, i put a little red loctite on them to retain them.

So i stayed late tuesday night and go all the parts deburred and tumbled The tumbling evens out the machining marks,breaks all the edges,and gives the parts a more industrial appearance. They should be back from annodizing tomorrow I did decide to hold back the J1 and J2 spindles, as well as as the small j5 parts. since they arent visible when assembled. Looks like im building a robot this weekend