what this is for? they are not the same height, it appears, so why parallels? (i know what an optical flat is.)
Glass Optical Flat Parallel Set 9 mm. | eBay
Glass Optical Flat Parallel Set 9 mm. | eBay
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optical parallels
- Thread starter dian
- Start date
- Replies 4
- Views 2,772
John Garner
Titanium
- Joined
- Sep 1, 2004
- Location
- south SF Bay area, California
dian --
Probably the most common use for sets of optical parallels of different thicknesses is to check the non-parallelism of a micrometer spindle face to the anvil face at different rotational positions of the spindle. Usually the checked positions differ by half a turn of the spindle -- which means the optical parallel thicknesses need to differ by half the pitch of the spindle screw -- but I've heard tales of checking at quarter-turn increments.
John
Probably the most common use for sets of optical parallels of different thicknesses is to check the non-parallelism of a micrometer spindle face to the anvil face at different rotational positions of the spindle. Usually the checked positions differ by half a turn of the spindle -- which means the optical parallel thicknesses need to differ by half the pitch of the spindle screw -- but I've heard tales of checking at quarter-turn increments.
John
M Stewart
Plastic
- Joined
- Jul 30, 2014
- Location
- United Kingdom
I bought a set of 4 from Ukraine about 3 years ago. The widths of my set are 15.62mm, 15.75mm, 15.87mm and 16.00mm, and they're for micrometer calibration, and were supplied with an individual signed calibration certificate, from 1984. So, I suppose, they're new, old stock.
Last edited:
Gordon B. Clarke
Banned
- Joined
- May 29, 2010
- Location
- Denmark
I'll have a go at this and try and keep it very simple.
Separate the two words "flat" and "parallel". The objects shown can measure both how "flat" something is (for example the surface of a gauge block) or as others have mentioned, how parallel the contact surfaces are on for example a micrometer.
Think of them as "two in one" rather than one thing.
