Adafruit Industries Mituroyo Manual de usuario
Calipers
Created by lady ada
Last updated on 2018-08-22 03:30:41 PM UTC
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Guide Contents
Guide Contents
Overview
Digital vs. Dial Calipers
Storage
Battery Life & Replacement
Setting the Origin
Basic Measurements
Outer Measurement
Inner Measurement
Depth Measurement
Step & Relative Measurements
Other Measuring Tips
Measuring Connector Pitch
Measuring Pin-to-Pin Distance
© Adafruit Industries https://learn.adafruit.com/calipers Page 2 of 18
Overview
This tutorial is for the Mitutoyo digital calipers we carry in the Adafruit shop (https://adafru.it/aIH). They're the best
calipers one can get and we're pleased to offer them. We've put together a basic usage guide here to help people get
started.
© Adafruit Industries https://learn.adafruit.com/calipers Page 3 of 18
Digital vs. Dial Calipers
There are a few different types of caliper you'll come across: digital, dial and vernier. We're going to skip vernier and
show the difference between dial and digital.
Dial calipers use a mechanical system consisting of a rack and pinion, there's a gear-set inside as well that moves the
dial in increments of one thousandth of an inch (or hundredth of a mm). To read, the 'most significant' value is read
from the rule and the fractional value from the dial. The nice thing about dial calipers is that they don't use batteries
and although are not waterproof, work well even if damp.
There are some downsides: if they are dropped, the rack and pinion can get out of alignment (especially on cheaper
calipers) and it can be difficult to recalibrate. They're a little tougher to read and often are either imperial or metric (but
not both).
© Adafruit Industries https://learn.adafruit.com/calipers Page 4 of 18
Digital calipers don't have any rack/pinion/gear system. This makes them more shock-proof which we like (since we're
a little clumsy and have dropped the calipers a few times).
Digital calipers can also easily convert from inches to mm and back which we really like since a lot of electronics is
mixed-units.
© Adafruit Industries https://learn.adafruit.com/calipers Page 5 of 18
So how does a digital caliper work without gears? it turns out that underneath the plastic 'ruler' overlay is an engraved
copper design. The slide part has a circuit board with thin strips that look like a 'comb'. The comb and copper pads
form a grid of capacitors, two conductive plates separated by the dielectric plastic overlay. (https://adafru.it/aJ6) As the
comb slides over the copper pattern, the capacitance between the plates changes. If the patterns are engraved
precisely, even very small changes in capacitance can be detected by an analog interface (such as an RC timer or
oscillator).
Photo from PhysicDude (https://adafru.it/aJ7)
This means that if the dielectric changes it can mess up the readings. For this reason, digital calipers can give jumpy
© Adafruit Industries https://learn.adafruit.com/calipers Page 6 of 18
readings if they are dirty or wet.
© Adafruit Industries https://learn.adafruit.com/calipers Page 7 of 18
Storage
Keep your calipers happy and safe in their box. Even though digital calipers are in many ways more durable than
mechanical/dial types, especially with respect to shock, when traveling or storing, keep 'em in the case!
© Adafruit Industries https://learn.adafruit.com/calipers Page 8 of 18
Battery Life & Replacement
Digital calipers do require a battery (there are solar ones as well, with an internal backup battery) but good calipers
rarely need to have the battery replaced. The pair we have is used many times a day and often isn't even turned off for
a few days but has been running without issue for over 5 years. We do suggest turning them off when not in use but
many people don't even bother since the battery drain is so low.
To replace the battery, just snap of the top cover, the battery is LR44/SR44 size 1.5V button battery, available in any
hardware or grocery store. The Silver Oxide SR44 costs more, but will last longer.
© Adafruit Industries https://learn.adafruit.com/calipers Page 9 of 18
Setting the Origin
Before using your calipers, check that the origin is correct, clean the blades with a cloth to make sure there's no dust
or dirt that would give the wrong measurement and close the jaws. You should read 0.0mm, if not, check that they're
clean and if so, press the origin button. We've never had to do this since they are pre-origin'd at the factory but hey,
you never know.
© Adafruit Industries https://learn.adafruit.com/calipers Page 10 of 18
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