Neometrix / Materials Test Rigs / Tribometer Test Rig / NMX-TRB-67

NMX-TRB-67 · ENGINEERED-TO-ORDER CLASS — SPECIFY · MOUNT · SET · RUN · MEASURE · PROVE

Tribometer Test Rig. Friction belongs to the pair.

Name: Tribometer Test Rig
Brand: Neometrix
SKU: NMX-TRB-67

A tribometer test asks how a pair of surfaces behaves when one slides, rolls or is struck against the other: how much force the contact takes, and how much material it loses. The answer belongs to the pair and to the conditions, not to either material alone.

So the rig is built around three things: conditions that are held and recorded, not assumed, a contact that is the same every time, and a result that names the whole system.

Discuss a tribometer Capability note (PDF)

A single pin-on-disc tribometer on a plain white studio background: a heavy grey painted steel base carrying a smooth round bright steel disc stage on a short vertical spindle with a compact grey electric motor beside it, a stout vertical stainless steel column holding a horizontal loading arm that reaches over the disc to a small cylindrical pin holder, a slim square force sensor block on the arm with a thin black cable, and a neat stack of plain steel weights hanging from the far end of the arm, and no people

Fig · 01 — A pin-on-disc tribometer: a pin held on a loading arm and pressed on a rotating disc, with a force sensor on the arm and weights at its end — illustrative render.

The pair

named, not one materialboth bodies and the contact

The conditions

held and recordedload, speed, temperature, medium

The contact

the same every timealigned, with a stated running-in

The result

friction and wear togetherreported with the system

Status

engineered to orderno tribometer claimed

ISO 9001ISO 14001ASTM G99 · ASTM G133 · ASTM G77 · ASTM G76 · ASTM G32 reference methods

Overview

Why the whole job is naming the whole system.

Because a friction number or a wear loss is the response of a pair of surfaces under conditions, and a rig that does not fix the conditions cannot say what it measured.

A single twin-disc rolling and sliding test rig on a plain white studio background: a heavy grey steel base plate carrying two parallel horizontal shafts in grey bearing blocks, each shaft with thick bright ground steel discs pressed edge to edge, a guarded belt drive and a grey electric motor for each shaft, a lever arm with a stack of plain steel weights loading the discs together, a shallow stainless steel drip tray under the contact and a thin black sensor cable, and no people

Fig · 02 — A twin-disc rolling and sliding rig: two loaded discs on two driven shafts, with a drip tray under the contact — illustrative render.

Friction belongs to the pair.

What the rig is for

It slides, rolls or strikes one surface against another under a set load, speed, temperature and medium, and measures the friction force and the wear that result. It suits pin-on-disc and ball-on-disc tests, linearly reciprocating tests, block-on-ring and twin-disc tests, and particle erosion tests, built around the specimens and the conditions the customer needs.

Why friction belongs to the pair

The same steel gives a different friction against bronze than against a polymer, and a different friction again once a lubricant is added or the surface warms. A test measures the response of the whole system: both bodies, the contact, the medium and the conditions. So the rig names the system with every result.

Why one speed is not enough

A lubricated pair passes through three regimes as speed, viscosity and load change. In the boundary regime the surfaces touch, and friction is high and steady. In the mixed regime it falls as a film builds. In the hydrodynamic regime the film carries the load, and friction rises again with speed. A test at one speed can sit in any of them, so the rig sweeps the conditions instead of quoting one coefficient.

Why the conditions are held

Load, sliding speed, temperature, humidity and the medium all move the result. The rig holds each at a set value, measures it through the run, and writes it beside the friction and the wear.

Why the contact must be the same each time

Misalignment, a rough start or a different running-in changes the contact area, and with it the friction and the wear. The rig aligns every specimen the same way, runs a stated running-in, and records the contact it started with.

Why friction and wear are reported together

A low friction can come with a high wear, and the reverse. Reporting one without the other can mislead, so the rig measures the friction force continuously and the wear by a stated method, such as the loss of mass, the depth of the track or the volume lost.

The method

Specify, mount, set, run, measure, and prove.

Six steps in a fixed order. Setting the conditions against references, and measuring the wear by a stated method, are the two a quick order skips.

1 · Specify

The pair, the conditions and the standard are stated by the customer, and the rig is sized to the specimens and the conditions.

2 · Mount

The specimens are located the same way every time, the contact is aligned, and a stated running-in is run before the test.

3 · Set

The load, speed, temperature and medium are checked against references and then set, so the rig knows what it is holding before the first stroke.

4 · Run

The friction force is recorded continuously with the conditions beside it, and the run is stopped by a rule written in the test plan.

5 · Measure

The wear is measured by a stated method after the run, and the conditions are read back, so that the result carries its own record.

6 · Prove

The record is kept, and handed over with the rig.

The step people underrate is the check of the conditions against references. A rig whose load, speed and temperature are never checked cannot say what its friction number belongs to.

Fig · 03 — The same pair, three regimes: friction against speed times viscosity over load, with a rougher pair drawn dashed — a drawing of the idea, with no values.

Work content

What the rig contains, element by element.

Read it as a checklist: a rig missing a row will give a number it cannot defend.

A single solid particle erosion test rig on a plain white studio background: a bright stainless steel cabinet on a grey steel frame with its front door swung open, showing a small specimen holder on an adjustable angle arm facing a slim stainless steel nozzle tube, a stainless steel hopper with a conical base and a short round extraction duct on top, and a coiled flexible air hose below, and no people

Fig · 04 — A solid particle erosion rig: a nozzle and a specimen holder inside a cabinet, with a hopper feeding the particle stream — illustrative render.

Element	What it does	What matters
Frame and base	carries the contact	a heavy, stiff base and column, so that the flexing of the frame does not change the load at the contact
Specimen drive	moves the contact	a motor and drive that turn the disc or ring, or reciprocate the specimen, at a set speed that is measured
Loading	sets the contact load	dead weights, a lever or a servo actuator, with a load cell in the load path checked against a reference
Friction measurement	reads the friction	a force or torque sensor in the line of the friction, sampled continuously
Environment	holds the conditions	a heated stage, a humidity-controlled enclosure, a lubricant bath or a sealed chamber, as the test asks, with a temperature probe at the contact
Specimen holders	locate the pair	holders that locate each specimen the same way every time, so that the contact starts the same
Wear measurement	reads the loss	a balance for the loss of mass, a profile of the track, or a displacement sensor that follows the wear as the run goes on
Erosion head (where fitted)	puts particles on the target	a nozzle, a metered particle feed and an air supply, with the target held at a set angle and distance
Controller and logging	runs the test	sets the speed, load and temperature, counts the distance slid, stops the run on a written rule, and logs everything
Guarding and safeties	protect the rig and the room	guards round the turning parts, an over-load cut-out, extraction where particles or mist are made, and an emergency stop
Procedure	fixes the sequence	specify, mount, set, run, measure and prove, the same for every pair
Testing & documentation	prove the rig first	a check of the load, speed, temperature and force readings against references, a run on a reference pair, and a record the customer can inspect

The element that decides whether the rig tells the truth is the record of the conditions, because a friction number or a wear loss with no record of the load, speed, temperature and medium behind it cannot be compared with anything.

Full specification — expand

System	A heavy stiff frame; a drive that turns a disc or ring or reciprocates a specimen at a measured speed; loading by dead weights, a lever or a servo actuator with a load cell in the load path, checked against a reference; a force or torque sensor in the line of the friction; specimen holders that locate each specimen the same way every time; an environment as the test asks, a heated stage, a humidity-controlled enclosure, a lubricant bath or a sealed chamber, with a temperature probe at the contact; wear measurement by mass, by track profile or by displacement; where fitted an erosion head with a nozzle, a metered particle feed and a target held at a set angle; a controller that sets and logs the conditions and stops the run on a written rule; guarding and safeties; a written test plan; and testing and documentation before handover
The One Idea	Friction belongs to the pair.
Why Friction Belongs To The Pair	The same steel gives a different friction against bronze than against a polymer, and a different friction again once a lubricant is added or the surface warms, so a test measures the response of the whole system, both bodies, the contact, the medium and the conditions, and the rig names the system with every result
Why One Speed Is Not Enough	A lubricated pair passes through boundary, mixed and hydrodynamic regimes as speed, viscosity and load change, with a friction minimum between the last two, so a test at one speed can sit in any of them and the rig sweeps the conditions instead of quoting one coefficient
Why The Conditions Are Held	Load, sliding speed, temperature, humidity and the medium all move the result, so the rig holds each at a set value, measures it through the run and writes it beside the friction and the wear
Why The Contact Must Be The Same	Misalignment, a rough start or a different running-in changes the contact area and with it the friction and the wear, so the rig aligns every specimen the same way, runs a stated running-in and records the contact it started with
Why Friction And Wear Are Reported Together	A low friction can come with a high wear and the reverse, so the rig measures the friction force continuously and the wear by a stated method, such as the loss of mass, the depth of the track or the volume lost
Standards	ASTM G99 is the public test method for wear and friction testing with a pin-on-disk or ball-on-disk apparatus, ASTM G133 for linearly reciprocating ball-on-flat sliding wear, ASTM G77 for ranking resistance to sliding wear by block-on-ring, ASTM G76 for erosion tests by solid particle impingement using gas jets and ASTM G32 for cavitation erosion using a vibratory apparatus. This page prints none of their loads, speeds, distances or tolerances, and no edition year: those come from the method the customer names and from the pair. Approval of a pair or a test for use rests with the customer and the authority they name; none is claimed here
Configurations	A pin-on-disc and reciprocating tribometer, a twin-disc rolling and sliding rig and an erosion rig
Scope Boundary	This page is the tribometer test rig. It is not a materials impact testing machine, which measures toughness by a blow (see materials impact testing machine), not a bearing endurance rig (see bearing test rig) and not a dust and sand chamber (see dust and sand test chamber). A hardness tester, an oil analysis laboratory and a surface profiler are different instruments again. No certification is claimed here
Status	Neometrix has quoted against successive tribometer and wear test rig requirements, and no delivered tribometer is claimed.

Configurations

One method, three ways to build the rig.

The method, the record of the conditions and the measure of the wear are shared. What changes is how the contact is made: by a pin, by two discs or by a stream of particles.

Pin-on-disc and reciprocating tribometer

Specimen, load and drive

A pin or ball loaded on a rotating disc, or reciprocated on a flat, for the friction and sliding wear of coatings, materials and lubricants.

Twin-disc rolling and sliding rig

Two discs, load and speed ratio

Two loaded discs turned at different speeds, so that the contact rolls and slides together, for gear-tooth and rolling-contact studies.

Erosion rig

Nozzle or horn, medium and target

A particle-laden air jet on a target at a set angle, or a vibratory horn in a liquid, for the erosion of coatings and components.

And the part that is not equipment at all, yet decides all three: the test plan. It fixes the conditions and the sweep, the running-in, the stop rule, the method of measuring the wear and the number of repeats, and it is written from the pair and the method, not from the rig.

Where it is used

Wherever two surfaces meet under load, and the number has to be believed.

The common thread is a pair of surfaces whose life is a promise, and a test that has to keep it.

Coatings and materials

Where a coating or a material is ranked against another for sliding wear, under the conditions it will meet.

Lubricants and additives

Where a lubricant is judged by the friction and wear it gives, across the speeds and loads it will see.

Gears and rolling contacts

Where a rolling and sliding pair is tested on a rig before it is built into a machine.

Particle and spray erosion

Where a surface is exposed to a stream of particles and its loss has to be measured.

Watch

See it in motion.

A short walkthrough video of the tribometer test rig.

FAQ

Common questions.

Longer answers, for readers who want the reasoning.

Q · 01 What does a tribometer test rig actually do?

It slides, rolls or strikes one surface against another under a set load, speed, temperature and medium, and measures the friction force and the wear that follow. It holds the conditions, records them with every run, measures the wear by a stated method, and keeps the record. It does not choose the pair or design the part.

Q · 02 Why does friction belong to the pair and not the material?

Because friction and wear are the response of a system, not a property of one body. The same steel behaves differently against bronze and against a polymer, differently dry and lubricated, and differently warm and cold. A result is only meaningful with the whole system named beside it: both bodies, the contact, the medium and the conditions. That is why the rig records the conditions with every number it reports.

Q · 03 Why is one speed not enough?

Because a lubricated pair does not have one friction. As speed, viscosity and load change, the contact moves from boundary, where the surfaces touch, through a mixed regime in which a film builds and friction falls, to a hydrodynamic regime in which the film carries the load and friction rises again with speed. A test at a single speed lands in one of these and says nothing about the others, so the rig sweeps the conditions and reports the curve.

Q · 04 Why are friction and wear reported together?

Because they do not always move together. A low friction can come with a high wear, if the surface is being torn up, and a high friction can come with a low wear. Reporting only one invites the wrong conclusion. The rig reads the friction force continuously and measures the wear by a method stated in the test plan, such as the loss of mass, the depth of the track or the volume lost.

Q · 05 Is this the same as the impact testing machine, the bearing test rig or the dust and sand chamber?

No, and the differences are worth stating precisely. The materials impact testing machine page covers the instruments that measure toughness by a blow. The bearing test rig page covers a rig that runs a bearing for endurance. The dust and sand test chamber page covers a chamber that tests equipment in blown dust and sand. This page is the tribometer test rig. A hardness tester and an oil analysis laboratory are different instruments again. It does not replace any of them, and it does not claim what they claim a second time.

Q · 06 Has Neometrix built one of these?

We would rather answer this plainly than let a page imply otherwise. Neometrix has quoted against successive tribometer and wear test rig requirements, and no delivered tribometer is claimed. What stands behind the offer is adjacent: Neometrix engineers a materials impact testing machine (see the materials impact testing machine page), a bearing endurance test rig (see the bearing test rig page) and a dust and sand test chamber (see the dust and sand test chamber page). The motors, load cells, force and torque sensors, balances, profilers and controller hardware are catalogue items, bought in, not invented. What Neometrix engineers is the rig around them: the frame and the drive, the loading and the specimen holders, the environment, the record of the conditions, the procedure and the test plan. So the honest position is that the rig is engineered to order, the neighbouring disciplines are in the building, and the first rig of this exact kind will be built around the customer's own pair and method rather than taken off a shelf.

Q · 07 Which standards apply, and what can the rig not do?

ASTM G99 is the public test method for wear and friction testing with a pin-on-disk or ball-on-disk apparatus, ASTM G133 for linearly reciprocating ball-on-flat sliding wear, ASTM G77 for ranking resistance to sliding wear by block-on-ring, ASTM G76 for erosion tests by solid particle impingement using gas jets and ASTM G32 for cavitation erosion using a vibratory apparatus. This page prints none of their loads, speeds, distances or tolerances, and no edition year: those come from the method the customer names and from the pair. The rig measures and keeps a record. It does not certify a material or a coating: this page claims no certification or accreditation. No load, speed, temperature, friction or wear figure is printed here, and approval for use rests with the customer and the authority they name; none is claimed here.

Q · 08 What do you need from us to quote?

Six things, and most of them describe your pair rather than the rig. First, the pair: both bodies, their shape and their finish. Second, the method: which test geometry, and which public method if any. Third, the conditions: the load, the speed, the temperature and the medium, and the range of each. Fourth, the measure of wear: by mass, by profile or by displacement. Fifth, the stop rule: how long a run lasts and what ends it early. Sixth, the record: what you want kept with each run. From that we come back with a rig concept, a written test plan you can check, and a budgetary price.

The neighbouring test pages, and how they differ from this one.

Three neighbours: one measures toughness, one runs a bearing, one tests equipment in blown dust.

↗ A toughness test

Materials Impact Testing Machine

Pendulum and drop-weight instruments that measure toughness by a blow - one blow, where this page measures a contact that goes on sliding.

↗ A bearing rig

Bearing Test Rig

A rig that runs a bearing at speed for endurance - a test of a finished part, where this page tests a pair of surfaces.

↗ A dust chamber

Dust and Sand Test Chamber

A chamber that tests equipment in blown dust and sand - a test of an enclosure, where this page measures the loss of a surface.

Browse all Neometrix product lines.

Get a quotation

Tell us the pair, the method,
and the conditions.

The projects desk replies within two working days with a rig concept, a written test plan you can check, and a budgetary quotation. Write to [email protected] or use the form.

Enquire — tribometer rig Capability sheet (PDF) +91 7777 876 876

ISO 9001 / 14001 ENGINEERED-TO-ORDER CLASS — TRIBOMETER TEST RIG SPECIFY · MOUNT · SET · RUN · MEASURE · PROVE — FRICTION BELONGS TO THE PAIR ENGINEERED IN NOIDA · INDIA