regarding pinning off bolt holes, ive made hundreds of sprockets that way. we made the bolt holes a snug fit to the fixture bolts, then bench reamed the sprocket holes for more clearance. 2 bolts locate the sprocket. like a poor mans dowel setup.
OK, I didn't think it would work. This may be my lack of experience working with fixtures but with 6 bolt holes in the sprocket how do I know for sure after removing the sprocket for anodising that it go's back on the fixture in the same place so I can finish the job? or am I just over thinking this?
As an alternate, but similar, idea to what metalmunchr suggested, you could buy some shoulder bolts to fixture in the holes.
Not sure what hole size you have there, but you could order up shoulder bolts that fit snug in the holes.
If not familiar, shoulder bolts are bolts with a "dowel pin" built right in. An 8mm shoulder bolt, for example, would have an undersize 8mm shank followed by a 6mm thread on the end.
If shoulder bolts don't exist to closely match your hole diameters, just turn or grind them down so they do.
You could do similar with 2 simple dowel pins with the rest of the holes regular bolts.
If you are worried about locating back with the same holes, in the same orientation, after anodizing, make a mark on them so you know how to clock em after they come back.
Or if you really wanna get slick, get a machine with a probe, use G68 to rotate your program so even if you happen to be off 1/2 a degree, you'd still be good.
I agree you're overthinking it.
