Homebrew PCBs

derekhawkins wrote:
> Use shims and a dial indicator or use a flexible coupling. I prefer 
> proper alignment and rigid couplings. Yeah, machining and metal 
> working savvy is beneficial.

A flexible coupling will introduce error as
the encoder in this example is on the motor shaft
rather than the lead screw.

Coaxial alignment of two shafts is at best an
approximation irrespective of the machinist's
savvy or methods.

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