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HP 7475A Plotter: 09872-60066 Digitizing Sight

I found this antique on eBay for (somewhat) under HP’s 1980-era $35 price:

HP 09872-60066 Digitizing Sight - overview

HP 09872-60066 Digitizing Sight – overview

The prevailing price for HP 09872-60066 Digitizing Sights seems to be $100 and upwards, with outliers in both directions, so I just couldn’t pass it up.

Anyhow, the fiber optic pipe still works just like it did, back in the day:

HP 09872-60066 Digitizing Sight - text target

HP 09872-60066 Digitizing Sight – text target

The small dot in the middle is actually a paint-filled indentation on the bottom surface:

HP 09872-60066 Digitizing Sight - bottom detail

HP 09872-60066 Digitizing Sight – bottom detail

With the bottom flat on the target, the relayed image is in perfect focus:

HP 09872-60066 Digitizing Sight - top detail

HP 09872-60066 Digitizing Sight – top detail

The bezel recesses the top surface by 25 mil to protect the imaging plane.

OK, it’s a gadget gloat; I have absolutely no intention of ever chucking a piece of paper in the plotter and digitizing any points.

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  1. #1 by scruss2 on 2016-11-03 - 16:27

    I did, so you don’t have to: http://scruss.com/blog/2016/05/17/pen-plotters-not-just-output-devices/

    It was not really worth the effort, given what you can do in a web browser these days.s

    • #2 by Ed on 2016-11-03 - 19:46

      Turns out I have a stack of “historic” hand-drawn dot plots that need digitizing; I thought I’d have to gimmick up something involving a scanner and OpenCV, because I could never endure the digitizing sight for that many dots.

      Many thanks for the suggestion!

  2. #3 by madbodger on 2016-11-04 - 15:02

    In a similar vein, there’s a device to optically position a center punch. http://www.leevalley.com/US/wood/page.aspx?p=45502&cat=1,180,42311

    • #4 by Ed on 2016-11-04 - 18:55

      A 3D printed adapter for the HP sight springs, unbidden, to mind. [sigh]

      I’ve gotten to the point where I either don’t care how close the hole comes to the target or I use the Sherline for coordinate drilling.