Dividing head

What does the "optical" designation mean? Does it refer to the internal construction or the usage?
In any case, it looks like a very precise and expensive unit
 
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I'm going to go out on a limb, but I think that rotation is measured using an rotary optical encoder. Think of it as a glass scale DRO, but round, rather than linear.
 

Optical Dividing Head (Metrology)

8.4. Optical dividing head consists of a circular scale, suitably calibrated in degrees and fractions and fitted concentrically to the axis of the machine spindle. The scale is viewed through a microscope. It can measure directly upto 12″ of arc […]
what-when-how.com what-when-how.com
 
Choiliefan said:

Optical Dividing Head (Metrology)

8.4. Optical dividing head consists of a circular scale, suitably calibrated in degrees and fractions and fitted concentrically to the axis of the machine spindle. The scale is viewed through a microscope. It can measure directly upto 12″ of arc […]
what-when-how.com what-when-how.com
Click to expand...
Choiliefan said:

Optical Dividing Head (Metrology)

8.4. Optical dividing head consists of a circular scale, suitably calibrated in degrees and fractions and fitted concentrically to the axis of the machine spindle. The scale is viewed through a microscope. It can measure directly upto 12″ of arc […]
what-when-how.com what-when-how.com
Click to expand...
3 SEC Arc For PG
 
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