View Full Version : Interesting find - What is it??

03-27-2016, 10:48 AM
I picked this up from a closed aerospace machine shop.
It's about 30" tall, with a dovetail and rack on the Z axis.
It has two movable heads, each with what looks like a laser. These point at each other through the hole in the small table - which also moves.
Brand is Cleveland, and it also is marked "Micro-Ac"

I intend to repurpose it something different (Suggestions?), but before I reach the point of no return I'd like to know what it was used for. Anyone recognize it?

http://i27.photobucket.com/albums/c196/rburkheimer/Machines/b26bd87e-5602-48a0-bb5a-a4619f970056.jpg (http://s27.photobucket.com/user/rburkheimer/media/Machines/b26bd87e-5602-48a0-bb5a-a4619f970056.jpg.html)http://i27.photobucket.com/albums/c196/rburkheimer/Machines/IMG_7049.jpg (http://s27.photobucket.com/user/rburkheimer/media/Machines/IMG_7049.jpg.html)

03-27-2016, 11:35 AM
looked like a hardness test, but then I saw laser, optic bench for lenses?

03-27-2016, 11:45 AM
It's similar to a hardness tester, but the working tips are glass.
A hardness tester usually has a hard point and an anvil. This has neither

This shop made parts for Bell Helicopter. They had both manual and CNC machines.

03-27-2016, 01:36 PM
See your outher post.

03-27-2016, 02:38 PM
It's an 'opposed head comparator' originally designed for checking gauge blocks.

Using two comparator heads (instead of a single one over a fixed surface) eliminates the need to wring the gauge block to the reference surface and reduces the potential for error.



03-27-2016, 10:47 PM
Barrington, that makes sense, thanks.
The only question now is does it use lasers or just small camera lenses with the video fed to a PC?

03-28-2016, 06:55 AM
No, these aren't comparators in the sense of 'optical comparators', they're an electronic version of a very high resolution 'dial gauge'.

A spring loaded plunger moves axially and it's position is determined electronically (usually electromagnetically via an arrangement of coils - Google "LVDT").

With the opposed head type two transducer inputs are simply combined to show changes in the distance between the two tips.


edit: Link to 'Handbook of Dimensional Measurement':- LINK (https://books.google.co.uk/books?id=qFiUBgAAQBAJ&pg=PA161&lpg=PA161&source=bl&ots=WRdsaUppXr&sig=g_kIPkSWUI9T5a_I6nnLkugp8FY&hl=en&sa=X&ved=0ahUKEwil_IDlnePLAhXDrRoKHSBZAZcQ6AEIHTAA#v=on epage&q&f=false)

03-28-2016, 07:43 AM
I have not checked to see if the tips are spring-loaded, but they are glass.

03-28-2016, 09:07 AM
I would use it to support a camera for taking pictures of flat things. books, art, things that don't scan well.

03-28-2016, 09:42 AM
Actually, I have an ongoing project to do just that. I have already modified a Shadograph to mount a DSLR over a lightbox to photograph slides. Once finished I found I did not have a lens that would focus under 1 ft. This column gives me twice that focal distance, so it might work. GMTA