CMM technology guide


Catalog excerpts

CMM technology guide - 1

Pocket guide: An explanation of CMM sensor technologies CMM technology guide A guide to CMM sensor technology – the heart of any CMM

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CMM technology guide - 2

CMM technology guide an explanation of CMM technologies Pocket guide contents CMM Technology This pocket guide provides an overview of the different sensing technologies available from Renishaw for in co-ordinate measuring machines (CMMs). It will help you select the right equipment for your CMM to get the very best out of your investment. It will be particularly useful when specifying new CMMs or considering upgrades or retrofits. “…boost inspection throughput by as much as 50 times. ” See section 6 5-axis measurement – Renscan 5™ 2

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CMM technology guide - 3

apply innovation" The range of automated probing systems at a glance 4 Touch trigger probing - an introduction 5 Touch trigger probing - entry level auto-indexing and 6 stylus changing Touch trigger probing - advanced 7 Stylus and probe change racks - changers' promotion 14-15 Styli selection - good practice 16-17 Monitoring CMM accuracy - Machine checking gauge (MCG) 18-19 Renishaw retrofits - A one stop shop service 20 Worldwide contact information 26

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CMM technology guide - 4

1 Investment Automated probing The range of automated probing at a glance REVO™ system 5-axis scanning PH10M, SP25 (free rack*) PH10T, TP20 (free rack*) RTP20 and rack Touch trigger * see section 7 4 3-axis scanning Touch trigger CMM throughput

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CMM technology guide - 5

Touch trigger probing – an introduction Touch trigger probing Renishaw invented the first touch trigger probe back in the early 1970s and since then, has constantly developed the technology to offer ever-increasing levels of accuracy and flexibility. The job of a touch trigger probe is a simple one: to act as a highly repeatable, sub micron, switch giving a trigger signal when a surface to be measured is contacted. 2 This type of probe is best suited to applications where a few touch points are sufficient to define each feature of a component. Examples include prismatic parts with easily...

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CMM technology guide - 6

Touch trigger probing – with entry level auto-indexing and stylus changing Touch trigger probing - RTP20 RTP20 – ‘round the pole’ head The RTP20 head is a novel hybrid between a manual and a motorised indexing head and uses the CMM motion (not in-built motors) to automatically index to a range of positions at 15° increments (see picture sequence to right). The industry standard TP20 probe body is integral to the head and it can carry the full range of TP20 modules, giving an overall reach of up to 155 mm when a 60 mm stylus is used. The TP20 modules can be automatically changed using the...

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CMM technology guide - 7

Touch trigger probing – advanced PH10T indexing head and TP20/TP200 probe (with free change racks*) *End users buying a PH10 head (or PH9 – PH10 upgrade) through participating OEMs receive a free MCR20 or SCR200 change rack - see section 7, ‘changers’ promotion for full details Touch trigger probing - PH10T Always choose touch trigger probes with detachable magnetic stylus modules; they are no more expensive than older fixed types, and have significant time saving benefits and extra crash protection (e.g. TP20 and TP200). The PH10 range of motorised heads represent an auto-indexing solution...

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CMM technology guide - 8

3-axis contact scanning 3-axis scanning - SP25M Renishaw’s high accuracy award winning SP25M is the most compact 3-axis scanning probe available, allowing it to be fitted to the PH10M/MQ indexing head. SP25 is two probes in one - a high accuracy scanning probe and a touch trigger probe, giving added flexibility. 3-axis contact scanning offers significant speed advantages over touch trigger data capture. 5 3-axis scanning operates in a different way from touch trigger probing, by constantly streaming data as the stylus ‘scans’ in contact with the measurement surface (2000 – 6000 points a...

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CMM technology guide - 9

In these cases a few touch points don’t give enough information to accurately measure the form. The SP25M is the most recent 3-axis scanning probe of this type and is mounted using the autojoint connection on PH10M or PH10MQ heads. The PH10M is a shank mounted head, whilst the PH10MQ is directly mounted within the quill of a CMM. Gear inspection is 30 times faster It now takes Meltham Mills Engineering (MME) only eight minutes to inspect every critical feature on a typical gear component; 30 times faster than previously. Simultaneously, data is gathered on the form of features, the first...

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CMM technology guide - 10

5-axis measurement – with Renscan5™ 5-axis measurement Renscan5™ is a revolutionary new CMM technology giving unrivalled speed and accuracy to boost inspection throughput by as much as 50 times. The 5-axis technology can run identical routines to those commonly used with conventional touch trigger or 3-axis scanning probes, but also has additional time saving features for users to exploit. 6 Even before measurement begins, the technology reduces set-up time because Renscan5™ probe heads (eg REVO™) only require a single 20 minute calibration routine to be accurate at all angles of their...

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CMM technology guide - 11

Sweep scan Head motion CMM constant velocity 5-axis measurement Head motion This novel technique can also be used to take very rapid points on flat and freeform surfaces. The machine’s axes guide the head parallel to the surface and the ‘tip sensing’ probe flicks down to take points without the machine slowing down (although scanning could be even quicker in many applications). Most modern components are designed in CAD where designers have much more freedom to produce complex forms. When the finished components are inspected, it takes far too long using touch trigger probes or even 3-axis...

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CMM technology guide - 12

5-axis measurement – with Renscan5™ continued Renscan5™ uses novel techniques to eliminate dynamic errors from scanning results: 5-axis measurement By fixing the machine’s X, Y and Z-axes, whilst the 2-axis servo head scans the surface with a ‘tip sensing’ probe, no machine accelerations or decelerations are present to create dynamic errors. In certain applications it isn’t possible to measure components with the machine axes fixed. Instead the axes are moved in a vector (at constant speed) resulting in a smooth motion with minimal acceleration or deceleration, enabling the servo head and...

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