Only One Company Builds An Accurate CMM

ACCURATE GAUGING

Accurate Bridge CMM’sProduced to exacting standards using traditional manufacturing philosophies our CMM’s are manufactured with inbuilt inherent precision. Today’s industry norm is to add final CMM precision as an external event using software error corrections techniques.Accurate build fine CMMs from proven metrological materials with quality and performance levels equivalent to industry benchmarks.Accurate; where tradition is a virtue and delivered at unrivalled competitive pricing.No compromises by Accurate; in inherent precision, build quality or performance. Why compromise when choosing a CMM when with a Accurate CMM you don’t have too?

Accurate Gauging – Suppliers of competitive CMM solutions with traditional values.

Look closer at what makes an Accurate CMM Accurate

Never heard of Accurate?Accurate will soon be celebrating its 50th anniversary manufacturing metrology equipment with our flagship product being a range of high accuracy CMM’s. Our traditional Bridge CMM Machines were developed during a period of cooperation with a German CMM builder; our technical developments today are under the coordination of the former R & D Director of Italy’s largest CMM builder.

But these companies have:

Accurate Bridge CMM’s

The Accurate range of bridge-style Coordinate Measuring Machines are manufactured from

granite; the proven metrology material provides for stability, accuracy and long life performance.

Manufactured in India at our impressive vertically integrated manufacturing facilities the Bridge CMM structures offers a no compromise,

proven technology solution, with quality and performance you expect from such a critical

investment.

Accurate Gauging manufacturing plants are certified to ISO9001 by the International

Accreditation Group Bureau Veritas.Accurate is also Certified to ISO/IEC 17025 by NABL; the India National Bureau of Standards

who are signatures to the globalization of international quality standards.

India!CMM structure technology is mature and CMM Frames can now

be sourced from anywhere in the world.While there are numerous CMM builders in China few have any

export experience and questionable quality consistency. Spiraling inflation and escalating labour costs in China ensure that its days as a low cost manufacturing region are coming to an end. Indeed the new mandate of the Chinese Government

is for their manufacturing industries to focus their future attention on high technology industry.

India, with its vast population, will remain a competitive manufacturing nation for decades to come. Today India has

overtaken USA as the world’s largest car producer. The economic advantage of India is best represented by the TATA Nano car that is selling for $1500 and demonstrating both the engineering intellect of India and its low cost manufacturing

capabilities.

Both Jaguar and Land Rover are now Indian owned Companies whose fortunes have been dramatically turned around since

exiting Ford Motor Company ownership.

Accurate CMM’s proudly built in India.

Benefits of India• We have a quality and service heritage and you can trust us.• We speak your language and you can pick the telephone up and call

us.• Our entire company speaks English not just our export manager and

English is the standard company language.• We are a preferred Renishaw OEM partner• We supply CMM Frames with inherent accuracy not ones reliant upon

error mapping.• Unlike China our prices will remain competitive for years to come.

The Chinese Yuan has dropped in value against the $US by 20% in the last 5 years making Chinese export more expensive. In additional further political pressure will ensure a further and ongoing devaluation by China. The Indian Rupee is a free commerce currency and is stable to the $US.

• China inflation is currently running at 6.5% and average employee salary increases at 8.3%.

• The once plentiful supply of cheap Chinese granite is ‘drying up’ since environmental issues have forced the closure of most Chinese Impala granite quarries. The Chinese granite processing companies are now buying quarried granite blocks in India.

• Almost all of the big name global CMM manufacturers have long sourced their granite in China; so the Origin Plate on a CMM showing ”Made in USA” , “Made in Japan”, ”Made in Germany’ do not tell the true story of the actual CMM parts origin. So why not Made in India.

China is losing it competitive edge

Family ValuesThe family owned Accurate Gauging has sufficient economy of scale to be

globally competitive yet remain building CMMs with the individual craftsmanship that ensures each machine meets its accuracy specification

with relative ease and without the necessity to rely solely on software error correction techniques: now the industry norm.

Accurate is a true CMM manufacturer; not just an assembly shop for outsourced parts typical of today’s CMM supply industry. The Black Impala

granite used is renowned for its superior qualities of improved stiffness, less porosity and a 50% improved resistance to humidity over the more

commonly used Chinese black granite.Our granite machining facilities were originally installed in Italy at the Poli

CMM Manufacturing facility; this critical investment allows Accurate to control the quality levels of its granite components rather than the industry

norm of out-sourcing granite from third party suppliers.

Rock Solid ValuesThe Impala granite comes to Accurate Gauging from Indian granite quarries

located within close geographical reach. Final granite grinding and hand-lapping takes place at the

Accurate Gauging granite production facility in Pune adjacent to our CMM

assembly.Few CMM company are responsible

for their own granite production; the base of a CMM’s performance. We

control our CMM Quality.Indian Granite Quarry face where Impala Granite is plentiful and

now sourced by the Chinese suppliers

Granite –The CMM Material of Choice Granite has long been the material of choice for metrology applications due to

its unique properties when compared to other common manufacturing materials.

The chart below clearly confirms that this historical selection was based upon scientific facts and granite remains the base plate material for all metrological

measuring structures. Why not then the moving bridge structure of a CMM?

With an Accurate CMM it is.

The Granite Advantage Mass Expansion Coefficient Thermal Conductivity Metrology Value

Material kg/cu.m ppm/ oC w/m/ oC GradeGranite 2.7 6.3 3.4 10Aluminium 2.6 23.7 215 2Ceramic 4.0 7.8 24 6.5Steel 7.8 11.5 40 6.5

Traditional ConstructionAccurate Bridge CMM’s use traditional design principles learnt from collaboration with German CMM Companies and are manufactured using metrologically sound materials.

Looking under the covers of an Accurate CMM tells the story.

Traditional Construction-2

Weighing up the DifferenceThe investment by Accurate in the very best CNC Grinding Machines ensures granite components are

produced to outstanding straightness and flatness specifications thereby minimizing the final hand-lapping process. All granite CMM motion

components are core drilled before grinding removing as much mass as possible ensuring an Accurate all-

granite CMM frame has competitive measuring performances when

compared to the lighter, thin-walled, aluminum framed CMMs offered by

many competitors.

Scanning Performance 1stThe black Impala Granite Accurate CMM line was developed using finite

element analysis techniques and created as a scanning CMM; the demands on scanning CMM frames are far more than demanded for

touch probe application. Stiffness with minimum deformation are demanded due to the

acceleration forces exerted by continuous motion scanning and the ever changing CMM motion directions.

Granite CMM structures are renowned for their stiffness and the structure of choice by all manufacturers for their ultra high performance scanning CMM’s. Granite offers the perfect scanning platform when compared to

aluminum framed CMM’s which are far less rigid.

Stiffer than the CompetitionThe CMM structural deflections caused by acceleration varies greatly within a CMM frame. Finite Element Analysis (FEA) of an example structure shown

demonstrates that least deflection occurs at the point of attachment of the

moving bridge to the base plate. The greatest deflection is at the opposite side (non drive side) and also at the

probe attachment point also. The use of stiffer materials for the CMM bridge

beam and Z ram is the optimum method for reducing these metrology critical

acceleration deflections.Granite therefore is the perfect CMM materials to minimize these dynamic

deflections.

Symmetrical Design Standards A symmetrical CMM rectangular bridge beam will dissipate heat with its environment in a uniform manner whereas a non-symmetrical triangular CMM bridge beam will not as shown in the diagram. The resulting rectangular beam will expand and contract in a more predictable manner that the triangular beam enhancing machine stability.

Thermal compensation employed by CMM manufacturers typically only modifies axis linearity scale parameters and the software must assume linear thermal expansion which in practice does not happen.

Intellectually ThickAccurate bridge CMM’s are supplied with

granite base plates hand lapped, to AA surface plate standard, and with plate thickness greater

than the industry normal. The stability of all bridge CMM’s comes from its surface plate; cost pressures over past decades has caused CMM

builders to ‘thin’ plates dramatically and no longer provide their granite tables to surface-

plate flatness standards. Not so with Accurate CMM’s .

Accurate does not compromise product quality or technical integrity to maximize profit margins. While

some competitor’s even measure the deformation of their thin granite plates,

attempting to compensate for this deformation, with software Accurate continues with sound and proven engineering principles to produce

its stiff and stable CMM’s.

Changing Standards!Granite is an expensive raw material to buy and expensive to process. It’s also expensive to ship due to its mass. Over

the years CMM manufacturers have used less granite in its CMM base plates to

save both material costs, processing time and shipping costs.

But at what cost to the user? Look at the granite base thickness on this 25+ year veteran Renault-Federal CMM

that’s still in daily. The Renault designers obviously knew the role the granite plate had in creating a stable CMM platform.

What Changed!

Granite InsertsAccurate CMM’s are supplied with practical M10 threaded inserts on a dense 200mm x 200m grid pattern. The trend in past years has been to reduce granite CMM plate inserts reducing costs and some popular CMM’s are now supplied with inserts on a 400mm grid matrix forcing the use of fixture plates and limiting severely the positioning of Renishaw Change Racks.

Round or Square Air Bearings?Accurate CMM’s are supplied with single jet

cylindrical air bearings rather than the cheaper rectangular style bearing used by most price

driven competitors machines. The Accurate air bearings have a hemi-spherical pocket ground into their surface providing a air cushion for

the bearing to float upon rather than just rely on bearing lift created through bearing air flow.

Circular bearings do no suffer from rotational issues that plague rectangular bearings and are perfectly stiff. Rectangular bearings suffer from

‘curling’ whereby the created air-pressure forces causes a deflection of the rectangular bearing at either end reducing their overall

efficiency and impacting negatively on CMM accuracy particularly in demanding scanning

applications.

Bellows ProtectionThe Accurate Bridge CMM’s X and Y axis are

fully enclosed with concertina bellows. These reinforced machine tool quality blinds are

secured using ‘Velco’ allowing quick detachment for maintenance. Frictionless in

performance the bellows infer no drag to each individual CMM axis.

Accurate Green CMMAccurate CMM air consumption is minimized reducing running costs and also significantly quieter in operation than CMM’s with free flowing rectangular ‘whistling’ air bearings.

Each group of air bearings can be regulated for flow and pressure from the master control

panel mounted on the machine base allowing your CMM performance to be optimised at

every annual service intervention. Individual axes can be switched off during the

CMM calibration procedure. Competitors’ cost reduced CMM structures

have a single air entry point with no individual air-bearing flow regulation meaning air

starvation to the weakest link bearing will occur over time resulting in potential machine damage and expensive service interventions.

All pneumatics are from industry leader SMC including the piping ensuring local availability globally. Cheaper air hoses used by competitors perish with time and require an expensive re-hose after just a few years; this can take up to 2 days to complete and is expensive.

CMM Thermal EncapsulationThe granite X-Z bridge beam steel supporting

structure of Accurate CMM’s are fully encapsulated by covers providing an air gap

between cover and support forcing any environment thermal change to have to

radiant through the covers and the air gap before having any impact on the CMM

metrology structure. Combined with the thermally inert granite structure the design provides a thermally

stable CMM structure.

Accurate CMM MotionAccurate CMM’s are supplied with either the Renishaw UCC Controller solution or Pantec

Eagle. Both CMM Controllers have well proven reliability and performance for touch probe

and scanning applications.Uniquely for a CMM supplier Accurate focuses on its core business of CMM frame design and

manufacture leaving the CMM Controller business to the experts.

An Accurate CMM can be supplied with your preferred CMM software including the Renishaw MODUS product since both

controllers support the I++ interface and offer open architecture calibration and service

software tools. Either controller can be configured to support

Renishaw SP25 or SP80 scanning probes.

Axis TechnologyAccurate CMM structures offer the perfect

platform for Renishaw 5 axis technology probing solutions due to their intrinsic

accuracy and superb inherent stiffness. Whether the customer application requires a

touch-probe or scanning solution the Renishaw PH20 and REVO probes are fully integrated with Renishaw UCC controller

technology and Renishaw MODUS software. With global support Renishaw 5 axis

technology CMM is Revolutionising part inspection and dramatically increasing CMM

productivity.

Accurate Granite Machining

Accurate CNC Machining

Accurate CMM Assembly Floor

Accurate CMM Design Department

Accurate Support Group

Complete Accurate CMM Line

Only One Company Builds An Accurate CMM

others can only try!