Quote:
Originally Posted by DavidGitz
Is this a "rule of thumb" or have you actually seen that without using some sort of precision rotation method to change the diameter that even a small angle offset will result in the behavior I described?
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I suppose if you had a very nice vise with a vertical V-groove and a more-than-decent mill you might be able to pull it off if you can get it centered down the shaft (probably with some fancy edge-finding). The lathe makes it easier to just center-drill, drill and ream all from the tailstock. Or you can choose to turn your own pin onto the end like I mentioned above. Any misalignment at all with the pin could result in dead zones or even scratch the disk on the lenses. Of course if open-loop works for you, go with it
Show me the mentor who has never built a bad robot and I'll show you either a new mentor, a liar, or Andy Baker. - Andrew Schreiber [more] 
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