Putting It All Together

The knob will go on left side.  My first attempt to tap a hole in a purpose built knob was sufficiently disappointing 

that I cut a four-lobed knob out of 1/2" thick CFC:

There is no religious significance to one arm being longer than the other.  I started with a non-square piece of scrap.

I really should use a 6-32 screws to hold it in place on the D shaft.  (That is what it is called when you put a flat on a round shaft.)  It turned as expected.  Every turn on the knob rotated the shaft 1/80th turn.  

However, I noticed the set screw holding the spur gear on the shafts was so tall that it sometimes hit the worm gear.  Do I need a shorter set screw?  No, I need that to be a D shaft for its entire length.  That will put that M2.5 set screw low enough to not hit anything.  Fortunately, turning a round into a D shaft requires no programming.   I brought the end mill to where the shaft was already flat and moved in X to end of shaft.  

I think I will polish some of these pieces up next.  There are videos on YouTube about polishing carbon fiber.  Sand then polish like aluminum wheels.  This should be beautiful. 

It works.  Next step is putting a piece of Teflon in between set screw on worm gear and shaft so it can freely on the polar axis.