Precision Mensuration
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Definitions,
Surface Plates,
Indicators, Comparator Stands,
Z-Offset Gauges,
Depth Gauges,
Height Gauges,
Universal Gauge,
Inside Diameter Gauges,
Pin Gauges,
Runout &
Bore Gauges,
Calipers,
Micrometers,
Dial Test Indicators,
Coaxial,
Indicator Holders,
Thread
Gauges,
Angle Meter,
Angle Gauges,
Radius Gauges,
Infrared Thermometer,
Tachometer,
Sound Level Meter,
Scales
Definitions
Precision -
Made so as to vary minimally
from a set standard.
Mensuration - The act, process, or art of measuring. Measurement of
geometric quantities.
Resolution - Smallest difference between indications of
a displaying device that can be meaningfully distinguished.
For a digital display device, this is the change in the indication when the
least significant digit changes by one step.
Measurand -
A quantity that is being determined
by measurement.
Accuracy - Closeness of the agreement between the result of the measurement &
the
true value of the measurand.
See
Layout Tools Section.
Decimal
Equivalents of Fractions
Decimal Equivalents of #
Drills
Decimal
Equivalents of Letter Drills
Inch to mm Conversion
mm to Inch Conversion
Metric & Inch
Equivalents
Machinist Calculator
Surface Plates
Granite surface plates (+/-0.0001") in 18" x 12" x 3"
(85 lb.) & 12" x 9" x 2" (30 lb.)
sizes.
Use surface plate cleaning fluid to remove
dirt, oil, & marks left
by (aluminum) parts.
Protected with a custom-made all wood/glue cover.
Grade A accuracy is +/- 0.000075"
Grade B accuracy is +/- 0.000150"
Granite Surface Plate checked using an
autocollimator for
accuracy
assurance to meet or exceed
Federal Specification GGG-P-463c.
Includes a Certificate of Inspection.
Indicators
Mitutoyo electronic indicator
(1/2" range).
Resolution is 0.00005" (50 millionths).
Using a linear encoder,
it
always displays the
spindle's
absolute position
from the
origin at
power-on. Digimatic indicator
manual &
drawing.
A-axis tramming animation. Note the degrees scale.
Iteratively adjusted opposing pairs; 0-180 deg & 270-90 deg.
A wooden holder
for 3/8" stemmed digital & dial
indicator gauges. Many tools are supplied with their
own
indicator.
Two came with dial indicator
comparator stands & two with gun cartridge
measurement
fixtures. 2nd from the front is my first digital-style gauge
which was replaced by the front gauge that
has much
higher resolution.
The gauges vary by their respective
measurement ranges, accuracies, &
resolutions.
Their positions are offset to accommodate the lug back mounts.
The plungers of the more costly units are not compressed while stored.
Mill & Router Spindle Square
A spindle square used to align a CNC router.
Likely not accurate enough for metal milling machines.
Eighteen inches long. To setup,
mount in the chuck, place a
spacer under one indicator & zero then swing the
other indicator around to the
same spacer & zero.
The bar has to be very straight, rigid & the
center dowel must be perfectly
perpendicular.
One-half inch interference fit shank
using a precision ground
steel dowel.
Comparator Stands
Two, dial indicator comparator stands.
Used for quality
assurance (QA) size
measurements of many parts. Serrated
anvils are purportedly more accurate.
Several two-inch range gauges were used on
various machines before changing to
advanced DROs.
For example, I used two gauges just for the
Taig
micro lathe & to good effect, providing excellent control.
I liked it so much I went
digital for both X &
Z-axes
but later extensively modified the
lathe to be CNC.
Surprising accuracy & repeatability though low
durability, but given the cost,
acceptable if on a budget.
A two-inch range digital indicator that reads
to 0.0005"
resolution. It has an 8mm stem.
The fine adjustment mechanism for the stand.
A collar was made to adapt the 8mm stem to 3/8".
The screw is threaded
through to directly contact the stem.
Heavy
Note the robust adjustments.
Different types of dial gauge interchangeable
4-48 threaded
indicator points. To keep from straining
or breaking a gauge's internal alignment pin,
completely
depress the plunger so the
rack absorbs the loosening &
tightening forces before changing the points. Never use
Loctite.
Z-Offset Gauges
Z-axis offset animation showing a 3/4" end
mill being set at 4.000" above the vise
bed.
Starrett also makes a superior (expensive) 4-inch
special dial depth gauge for
Z-height setting.
A 3.000" height offset gauge using a 40 mm (1.5")
diameter
face Mahr dial indicator (GER) that reads to 0.0005".
Mahr is a top quality, durable, made in Germany,
dial test gauge; highly
recommended instrument.
Stem is 8mm (.315"). The 7.5mm (0.295") diameter flat
tip is an ideal shape. The
bracket is all steel construction.
All critical surfaces of the parts, including the round post
ends, were
precision surface
ground for high accuracy.
An adjustable, brass, over-travel
stop was added
so the needle can only turn about one revolution.
This height gauge design has excellent sensitivity
for delicate end mills & does
not require a lot of Z.
The bottom of this Z-offset gauge
needed lapping
which was performed on a granite
surface plate first using
320 followed 400 & 600 grit silicon carbide papers.
Moved the part in a figure-8 pattern to insure an even
removal of material. Significant surface improvement resulted.
The edges were
deburred
with an India stone.
This offset gauge has a magnetic bottom
which attracts debris
& the spring is too
strong for very small end mills.
2" high Z-offset gauge. A 3"
micrometer & a 1-2-3 Jo-block
were used to set the gauge's zero at
2.0000".
The recessed bottom required a Jo-block.
The micrometer
was first locked at 3.0000" using the
gauge
block.
Mill Z-offset gauge (instructions)
used to set tool lengths.
Needle-based, Z-offset gauges set the mill more quickly & accurately
than
illuminated types plus they are not damaged by over travel.
Animation showing a 2.000" Z-offset height being set
on the
Taig CNC Z-axis using the Mach3 MPG step mode.
Electric-type Z-offset gauge with 0.0002" repeatability.
It has a 1" x 2" x 3"
form factor. Uses 2, LR44 batteries.
Aluminum faces do not chip brittle carbide end mills.
May not work properly on
anodized surfaces (e.g., Taig).
The
analog dial-type with a needle have superior
setting ease, accuracy, & repeatability.
Checking the height & light/battery circuit.
Z-offset gauge instructions.
An animation showing a 1.0000"
Z-offset being set.
With the gauge light illuminated, the value (1.0000")
was then
entered into the Z-axis of the
mill DRO.
Here the electronic gauge is working on the
CNC Taig mill's anodized table. The connection was
completed by grinding off the black anodize on
the T-nut inner face & making
multiple punch marks.
The vise should not clamp the gauge that is deep in
the jaws as that would short-out
the upper & lower plates.
The punch
marks are raised & sharp thereby piercing
the table's inner T-slot anodized
surface to complete
the connection. Though maybe not necessary, this
can be done for all the T-nuts
that hold the vise in place.
A
tooling plate is mounted
onto the anodized table
where a 0.2 ohm conductivity is realized via 6, T-nuts.
The gauge can also be used with
parallels & lightly clamped into the vise.
Depth Gauges
Baker dial depth indicator (India) with a 0" to 10" range &
where one gradation = 0.001".
Rod extension chart.
.jpg)
The dial indicator gauge itself has a
0 to 0.5" measurement range. For the example shown
above:
Measured
Depth =
0.1840" (dial reading) +
0" (extension
rod
length) = 0.1840".
Micrometer depth gauge with a 0-6" range.
One gradation
= 0.001". Depth = reading + rod length.
A Mitutoyo digital micrometer head combined
with a hardened &
precision-ground depth base.
Note: Over tightening the set screw can distort
the mounting flange & bind the
mechanism.
The scale is not reversed like its mechanical
counterpart,
but digital micrometers can
be zeroed at any location & then the negative
sign is simply ignored for the
readings.
Hardened & precision-ground depth base
attached to a Mitutoyo digital
caliper.
Digital depth gauge with a large base.
See digital caliper manual.
Height Gauges
A Mitutoyo, 8", 543-244 digital height gauge with fine
adjustment mechanism. The height gauge & a granite surface
plate make an accurate
combination for measuring parts
or laying out
precisely scribed lines.
Resolution: 0.0005".
Absolute electrostatic capacitance type linear
encoder.
A fine adjustment carriage is a requirement for fast, accurate
settings.
See Mitutoyo 543-244 digital height gauge
manual &
dimensional drawing.
For accurate, repeatable
measurements, insure the surface plate, height gauge, &
scribe working surfaces are free of debris/grit.
Check to
see if the scribe bracket is tight. Periodically inspect the
adjustable
ways of the transducer for excessive play.
The heavy base has an excellent ergonomic design.
The bottom
surface
is ground & lapped to perfection.
Mitutoyo depth & center-finder
attachments for the height gauge.
Hole center-finder attachment.
Hole center finder animation showing how the fine adjustment
of the height gauge is used to zero the needle.
This tool allows comparative
QC measurements
of many holes in production.
Using a test gauge in conjunction with a height gauge
allows measurements of
both dimensions & tolerances
without having to use separate instruments.
See
instructions on how to
set tip geometry
&
see illustration.
Height gauge with digital indicator for
both height & tolerance measurements.
Starrett No. 3751 digital height
gauge manual.
Adjusting to a specific height can be accomplished by
picking it up & using it much like a regular caliper.
Slightly increasing the slide resistance of the transducer
(a small, side
set screw) helps adjustability.
Setting an exact numerical value with this type
of adjustment mechanism is
slower than
that of a height gauge equipped with a
fine adjustment carriage mechanism.
A Starrett Last Word DTI mounted onto the small,
3715 height gauge using the
711-49 bar attachment.
Mitutoyo
OEM wooden case.
Depth attachment. Rod accepts different 4-48 threaded
indicator points. This was my first height gauge.
It is easier to miss-read an analog dial than a digital
readout though analog
scales can be interpolated.
Measuring distances between holes using
a center-finder attachment
from Mitutoyo.
Height gauge with digital indicator
for both height & tolerance measurements.
Nominal dimensions of the base are 5.25" x 2.5" x 0.75"
(W x H x D).
Hardened & precision ground. The slide has a combination
of both a flat & a V-way to provide excellent accuracy.
The slide has a fine adjustment mechanism
allowing faster &
more accurate
settings.
No other similar gauges have this important
feature. Note the
mineral spirits bubble level.
Offset attachment with clamp bolt extends the nose for
a
minimum height of 0.17" allowing use in tight areas.
One-inch & three-inch extension rods can
be screwed in at four different locations.
A post clamp holds a hardened HSS
scribe which
is being set at 3.0000" height using a gauge block.
A Starrett Last Word DTI mounted onto the 995E
Universal
Gauge using
the 711-49 bar attachment.
Telescoping & half-ball
Mitutoyo inside gauge sets (Japan).
The half-ball type can get into a shallow, blind
hole
better than a ball type.
Expand into hole, lock & then
measure the gauge with a micrometer or caliper.
Left: The small (half-ball) hole gauge is
expanded by the center wedge.
Right: The telescoping inside gauge posts spring outward,
self-center & are then
locked via a knob on the handle.
They can then be accurately measured with a caliper or a micrometer.
Mitutoyo (Japan) tools have superior accuracy over
the
full measurement range, repeatability,
quality & durability.
This steel part is being held in a lathe.
The hole measured 1.6296". I then updated the
lathe's
DRO
X-axis setting for further boring.
Full-ball, small hole gauge set.
Half-ball compared to full-ball small hole gauge types.
gauges for
0.061" to
0.250" x 0.001" minus Class ZZ pin-gauge set (190
pieces).
Tolerance +.0000" -.0002".
10mm finish or better. Hardness 60-62 RC.
Detail of the 0.061" to
0.250" x 0.001", minus
pin-gauge set (still in the grease).
Two-inches overall lengths.
0.251" to 0.500" x 0.001", minus Class ZZ pin-gauge set (250 pieces).
Tolerance +.0000" -.0002". 10mm finish or better. Hardness 60-62 RC.
0.501" to 0.625" x 0.001", minus Class ZZ pin-gauge set (125 pieces).
Tolerance +.0000" -.0002". 10mm finish or better. Hardness 60-62 RC.
Go/no go pin gauge handles for QC work.
Shown holding 0.25" & 0.050" pin gauges.
Runout & Bore Gauges
Back-plunger dial indicator set (India) with 'G'
clamp,
universal clamp,
swinging-arm
assembly, tool post holder,
holding rod, Tommy bar & 2nd anvil. Swinging-arm assembly
enables the back-plunger dial gauge for use on
internal
work to a depth of 1.6" (40mm); similar to a lever-type
gauge. Allows multiple types of mounting possibilities
for
gaging applications
like concentricity checks, alignment of
machine tools, testing parallelism, & surface-plate work.
Back-plunger dial gauge with
a swinging-arm attachment.
Measuring the eccentricity & runout
of the ID of a
bored cylinder.
A self-centering, 1.4" to 6"
cylinder
bore gauge (instructions).
The gauge is first set up to measure a specific size (zeroed)
then run through the bore
to measure its variation.
To keep the extensions in order, a vibrator engraver
was used to label each size on
a non-critical surface.
The dial gauge must be
inserted deep enough to preload
(or move) the needle about 1 revolution
(0.050").
The black plastic shroud can be installed after
calibration to protect the head
under heavy shop use.
These 1/2" travel digital indicators, preloaded to 0.050"
depth, can also be utilized but
others may not work.
Exploded view of the 1.4" to 2" measurement head,
the 1.4" range
anvil & knurled anvil lock nut. The pointed
rod end (at the lower left) engages a rod inside the handle.
Anvil installation animation.
The center measurement anvil moves in & out.
The outside mechanism depresses under
spring tension to center the head.
Small anvil animation.
Assemble the appropriate anvils & spacers
(left side) for the
target measurement size.
Then, using a gauge block, set a micrometer
(e.g., 2") to the bore size & zero the dial
scale.
The gauge is then run through the cylinder &
the variation from set size, noted.
Bore gauge measurement
animation.
Note the small measurement anvil (left) depresses &
the
self-centering guide
mechanism slides to the right.
Calipers
Mitutoyo Absolute Digimatic caliper
(Japan).
An excellent digital caliper that is
very accurate
throughout its
entire measurement
range.
Always maintains zero, large LC display, greater
than 3 years battery life. No irritating auto-off.
Mitutoyo
digital
caliper manual.
A digital caliper (manual) that measures & displays
inches,
millimeters & fractions to 1/64th-inch.
Handy for wood work & sifting through raw stock.
Chromed, dial caliper gauge with a 0 to 0.8"
measurement range & a 0.0005" resolution.
The jaws are spring-loaded closed & are opened
with the lever. Custom wooden
box storage.
Ball bearing tips.
Before use, calibrate the dial scale
against a
gauge block of appropriate size.
I bought these gauges to allow me to
make measurements in tight mill
setups.
A snap thickness gauge. Close & zero the scale first.
8-inch digital linear scale for instrumenting
tools like
drill presses,
mills, &
lathes.
This open-weave drawer liner has (Microban)
antimicrobial properties that prevent bacterial growth.
The non-slip black cushion protects the instruments &
keeps them from moving
(banging) around, too.
Mitutoyo digital
measurement tools: depth gauge,
caliper & micrometer (older models).
Superior quality Mitutoyo (Japan) digital micrometer
that reads down to 0.00005" or
0.001mm.
The scales are engraved, not chemically etched
thus have superior readability &
durability.
Even if the battery is removed, the micrometer's
scales allow it to be used as a
standard instrument.
It has a micro-polished, carbide-faced
working surfaces & an effective spindle lock.
DO NOT store a micrometer (any style)
with its measurement
anvils touching.
See
micrometer manual.
The holder adjusts to different angles & has rubber pads
that protect the
instrument from clamping damage.
Another style micrometer
stand/holder.
This model has a nice, heavy base.
Mechanical digital-type outside micrometer, 1-2" range.
Standard & adjustment
tool, included.
Mechanical digital-type outside
micrometers,
2-3" range (above) & 3-4" range (below).
Standard & adjustment tool, included.
Digit Micrometer Manual
The one ten-thousandths-inch (0.0001")
measurements are read off
the (barrel) vernier.
All three shown for size comparisons;
size standards
included.
Small, 0.6" (non-locking) & standard 1" micrometers.
The
smaller micrometer's scales are chemically etched,
the larger micrometer's scales, engraved. Superior
instruments have engraved
scales for clarity & durability.
2-inch mechanical micrometer.
Micrometer set zero through six-inches
with its wooden
storage case (import).
One, two, three, four & five-inch sized
standards plus adjustment wrench are
included.
The plastic insulating grips on the standards
reduce warming effects (expansion) due
to handling.
Acquired for use mainly on the 9x20 lathe.
Excellent accuracy, engraved scales, & a good value.
All micrometers read to 0.0001".
The wooden
case was re-glued in places & then sanded.
See
micrometer scale reading instructions.
Though low-cost, the scales are engraved, the positive
locking lever is metal, & the ratchet
thimble is precise.
A good value for light use.
Detail of the 1" to 5" standards for
the 0" to 6"
micrometer set.
6" to 12" micrometer set.
All micrometers read to 0.0001".
The
smaller wooden case holds
size standards 6" through 11".
6" micrometer, shown.
12" micrometer shown with the standards case, open.
The holes
lighten the instrument for easier handling.
I needed the 7", 8", & 9" micrometers (for e.g., a flywheel)
so
it was more economical to buy the whole set.
I needed four, aluminum rods to be exactly 9.6250"
in length so the
9"-10" micrometer was used.
A 0.6" micrometer compared to a 12"
micrometer.
A micrometer head that can be
incorporated into
other devices e.g., an
adjustable lathe carriage stop.
The tip of the 0.2" diameter is domed & hardened.
The collar
is 3/8" diameter x 0.32" long.
The mechanical mic heads are low
cost items.
A 1/2" range, adjustable lathe carriage
stop.
Mitutoyo digital micrometer head.
Hub micrometer that measures 0-1" to 0.0001" &
designed to clear through a
3/4"
hole.
Handy in tight places especially in milling setups.
A 6" throated micrometer
having a measurement
range of 0 to 1" maximum with a 0.0001" scale.
Locking levers made of metal are a plus for
durability & precision of
the mechanism movement.
Caliper-type micrometer measures to 0.0001".
Measuring anvils
extend approximately 3/4".
The threaded mechanism that keeps the anvil from
rotating also acts as a somewhat
effective lock.
Disk micrometer with a 0.0001" scale.
0-1" range, 0.19" diameter anvil, tube wall
thickness micrometer
that measures to
0.0001".
Carbide-faced electronic blade micrometer
for measuring in narrow
slots & recesses.
The thread mechanism that keeps the
anvil from rotating also acts as a lock.
A 0.00005" minimum readout.
Digital
blade micrometer manual.
The blades are 0.030" thick.
1 to 2-inch blade micrometer
supplied
with a 1-inch standard & adjustment wrench.
Carbide-tipped, small faces or spline
micrometer for measuring in tight areas.
0-1" range with 0.0001 scale.
The anvils are 0.0775" diameter.
Carbide-tipped, point micrometer for measuring in
very tight areas. 0-1" range with 0.0001 scale.
Points have a radius of approximately 0.012".
(DTI)
SCREW THREAD MICROMETER ANVILS ANVIL #
1
2
3
4
5
TPI RANGE
64 - 48
44 - 28
24 - 14
13 - 9
8 - 5
METRIC RANGE
0.4 - 0.5
0.6 - 0.9
1 - 1.75
2 - 3
3.5 - 5
Anvil pairs are clearly marked for pitch range.
Example measurement of a 1/4-20 screw.
The micrometer reading is 0.2160".
Table pitch value is 0.2164" max.
A fast & accurate thread measurement tool.
The bolt freely rotates around the micrometer's anvil axis.
Carbide-faced inside micrometer gauges with locking mechanisms.
The top gauge range is 1"-2" & the bottom
gauge range is 0.2"-1.2". Supplied with 1" & 0.2" inside
ring standards, respectively. One gradation = 0.001".
| Interapid Model 312B-1 Horizontal Style DTI | |
| Graduation | 0.0005" |
| Dial Reading | 0-15-0 |
| Range | +/-0.060" |
| Point Length | 0.687" |
| Point Diameter | 0.080" |
| Dial Face Diameter | 1.5" |
| Stem Diameter | 0.156" (4mm) 5/32" |
| TESA Number | 74.111370 |
Accessories (Swiss): slotted reduction sleeve 3/8" to 5/32",
height gauge bar w/clamp, contact point wrench &
axial support with 3/8" diameter
stem.
The white tube in
the gray fitted storage box holds extra contact points.
Note the small (right of center) secondary revolution
counter needle used to
track the wide +/-0.060" range.
5/32" (0.15625" or 4mm)
pivoting stem,
dovetail mount, & monobloc metal housing.
Tramming a steel part before boring in the mill.
Zeroed at front, back,
left, right; X & Y tables then locked.
Starrett surface gauge &
Interapid dial test indicator
on the
granite surface plate being zeroed
using a 1" gauge block. If possible, move the
part not the gauge when
measuring a surface
unless, of course, the surface is being swept.
For highest
accuracy, the angle between the stylist & part
surface should be as close to
12 deg as possible.
The wide-range (+/-0.060") Interapid held by the rigid,
precise
Starrett base are an accurate combination on a surface plate.
Indicating the Parlec vise solid jaw, animation.
The slot on the
top of the solid jaw can also be used.
The Interapid indicator has 0.0005"
resolution.
See instructions on how to
set tip geometry
&
see illustration.
Here, the needle moves <0.0001" in the center
which is well below the manufacturer's vise spec.
An excellent BesTest Brown & Sharpe (Swiss) dial test
indicator set. One
gradation = 0.0005".
This model
incorporates an auto-reversing feature & dovetail mounting.
The Swiss
instruments are quite sensitive.
This
Starrett Model No. 711 DTI has a
small side lever
to select
the needle direction. No dovetail mounts.
Rugged LS Starrett No. 711 Last Word DTI
&
attachments (USA).
One gradation = 0.001".
Starrett 711-49 attachment:
2-5/8" OAL, 1/8" x 5/16" x 1-7/8"
rectangular shank, & a
3/4" long x 15/16" round tip.
Used to affix the Starrett 711 Last Word DTI to either
the
3751 Height Gauge or
the
995E Universal Gauge.
Gem DTI (USA). One gradation = 0.001".
Rod & dovetail mounting. Gem dial indicators & accessories.
See instructions on how to
set tip geometry
&
illustration.
Essentially a copy of the Starrett No. 711 but with slightly
different dimensions so accessories are not
interchangeable.
Federal Testmaster DTI (USA). One gradation = 0.0001".
Note needle reversing lever & dovetail mounting.
Various DTIs showing dovetails.
Top to
bottom: Brown & Sharpe (Swiss), Federal, & Gem (USA).
Fowler DTI set (import).
One gradation =
0.0005". Dovetail mounts.
Using Dial Test Indicators
- Test indicators are primarily
Using a Sparro 1st
Word holder & an LS Starrett Last Word DTI
to check the alignment of the mill/drill.
Nicely made, very rigid indicator holder.
Animation showing how to check alignment by
indicating the Rong Fu RF-25 mill table
Noga indicator holder (Japan) for
both dovetail & 3/8" stem types.
Note the fine
adjustment mechanism.
Noga
NF1018 indicator arm (Japan) with 3/8" & dovetail clamp.
This style arm is very quick & easy to set up plus it has very good rigidity.
Noga arm held by a modified,
V-groove tool post,
mounted off the headstock side T-slot of the
Taig mill.
Setup shows indicating a work piece before rotating
to a
specific cutting angle. The Noga arm is
good for aligning mills,
lathes & rotary tables.
Zero-set universal dial test gauge attachment (import).
A Federal 0.0001", dovetail mount, DTI
being used to
indicate the Parlec vise's solid jaw.
This style universal DTI holder gives
a broad sweep
of the small 18" mill table.
IndicOL #178 (USA) DTI holder attaches an
indicator to the mill's spindle. Best in class attachment.
Dovetail or stem-style test dial indicators
can be attached to this holder.
Half-round combination DTI (dovetail & stem)
with a 1/4" shank.
Modified an indicator clamp to hold various stemmed DTIs;
close to the center; rigid, compact, & quick.
Reamed two, 3/16" holes & the thumbscrews are
6-32
SS cap-head screws with pressed-on plastic caps.
Added another set screw to hold
the half-round combination
DTI holder.
Detail of the close-fitting brass bushing
(3/8" OD, 1/4" ID) that
is held in using red Loctite.
Added a 5/32" hole & set screw for the Interapid stem size.
Tramming a 6", 4-jaw chuck on a rotary table.
See
Rotary Tables.
A Mighty Mag (USA) magnet holds 3/8" (or smaller)
stemmed
indicators. Very powerful magnet.
Accurate low-cost 2" range analog positional readout.
This metric thread gauge is 0.11" thick
whereas the others are
0.08" thick.
Fractional, numbered, & metric
drill bit gauges.
A
metric drill bit gauge 1mm to
13mm by 1/2mm.
A 1/4" hole is on the far right end.
These gauges check both nuts & bolts. Metric are
black oxide
& imperial are galvanized. Sizes are clearly
stamped & colored.
Superior to plate-type gauges
which use only a few threads per size for testing.
Standard imperial & metric thread gauges.
Multiple edges provided for a given angle.
Countersink gauge with 1/32" scales.
Radius Gauge set 1/64" to 17/64" by 1/64" &
9/32" to 1/2" by 1/32", with handle.
Five
edges provided to measure
a given inside/outside radius.
Infrared Thermometer
Measurement Range
- 4
deg F to 968 deg F
-
20 deg C to 520 deg C
Measurement
Accuracy
+/-4 deg F below 212 deg F
+/-2% above 212 deg F
Response Time
500 msec
Distance to Spot Size
8:1
Battery Requirement
Standard 9V
The red laser beam is used solely for aiming.
An infrared (IR)
sensor actually measures the temperature.
The distance to spot ratio is 8:1., so for e.g., at a 16"
(407mm) distance the
measurement area is 2" (51mm).
| ATTRIBUTE | VALUE |
| Accuracy | +/-(0.05%+1 digit) |
| Sampling Time | 0.5 sec (over 120 RPM) |
| Range Select | Auto-Ranging |
| Memory | Max., Min., Last. Stores 96 sec of data |
| Time Base | 6 MHz Quartz crystal |
| Detecting Distance | 50~500mm |
| Power Consumption | Approx. 55mA |
| Measuring Range | 2.5~99,999 RPM |
| Resolution | 0.1 RPM (2.5~999.9 RPM), 1 RPM (over 1K RPM) |
| Total Test Range | 1~99,999 |
| Frequency Range | 1~1,666.6Hz |
| Resolution | 0.01Hz |
| Battery | 4x1.5V AA or external 6VDC regulated power supply |
Measuring RPM of the
9x20 lathe
variable DC motor.
Works best using a small patch of retro-reflective tape.
Sometimes I want to know sound pressure levels of
equipment or to re-equalize my
home theater systems.
Sit in prime listening position, measure C-weighted dB's using pink
noise
then, for a given
channel, adjust/equalize levels in the receiver.
E.g., lathe
sound pressure levels for the variable speed drive.
Sound level meter manual.
The meter's microphone.
Fuzion WB200
Scale. Excellent hard case
that latches closed; superior to magnetic type.
Most stable after brief warm-up, as per manual.
200g capacity, 2 AAA
batteries, 0.01g scale resolution,
180s auto-off, 6 weighing units (g,
oz,
gn,
ct,
dwt,
ozt),
Tare weight full
capacity, 128 x 88 x 22mm (L x W x H).
50g calibration weight & batteries,
included.
Fuzion WB200 Scale
Instruction Manual
Definitions,
Surface Plates,
Indicators, Comparator Stands,
Z-Offset Gauges,
Depth Gauges,
Height Gauges,
Universal Gauge,
Inside Diameter Gauges,
Pin Gauges,
Runout &
Bore Gauges,
Calipers,
Micrometers,
Dial Test Indicators,
Coaxial,
Indicator Holders,
Thread
Gauges,
Angle Meter,
Angle Gauges,
Radius Gauges,
Infrared Thermometer,
Tachometer,
Sound Level Meter,
Scales
