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Through CEMMNT clients can gain access to a wide range of high accuracy measurement techniques and expertise across a wide range of automotive applications. Please scroll down to view the range of applications available.
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Cylinder heads & blocks
Measurement of roundness and surface finish of prismatic components such as cylinder heads and blocks can pose a problem for traditional measurement instruments. Checking alignment and concentricity of long narrow bores such as cam and crank bores or measuring the angle of valve guides with respect to valve bores can all be achieved with the right instrument. Concentricity of valve guides to valve seats, alignment of cam and crank bores, or cylindricity and straightness of cylinder liners along with other geometrical tolerances can also all be effectively assessed.
Whether the surface is ground, turned, milled, plateau honed or whether its form is radial, angled or straight, the many different types of surface associated with engine blocks and heads warrant equipment with high versatility to cover all aspects of analysis. Through CEMMNT, clients gain access to not only the latest in state-of-the-art equipment, but the expertise specific to the measurements required, ensuring the highest accuracy and performance.
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Pistons, pins & rings
There are many stresses and strains exerted on a piston during its use, all of which cause come form of distortion. Piston designers attempt to predict this distortion by manufacturing the piston to allow for these effects. Because of the shape of the piston, normal geometrical analysis such as cylindricity, roundness and straightness are not enough on their own to define the shape of the piston. However, through CEMMNT various measurement solutions are now available via access to highly accurate measuring instruments, allowing piston manufacturers to develop more effective, better performing parts.
Radial and axial form of pistons, high precision cylindricity of gudgeon/wrist pins or even thickness variation and form of piston grooves can all be assessed using the wide range of Taylor Hobson roundness measuring instruments available to customers through CEMMNT. To examine wear or friction qualities of piston rings and pins or sealing faces of ring grooves, fast access to a wide range of surface finish instruments is also available to provide the solution.
Fuel Injectors
Ever increasing demands on vehicle fuel emissions mean tighter tolerances on components such as fuel injector systems, with tighter toleranced components requiring higher accuracy instruments. Sub micron roundness measurement combined with high accuracy and low noise surface finish measurement are essential features for measurement of common rail components.
Whether the component form is radial, angled or straight, the wide range of high accuracy surface instruments available through CEMMNT can measure both form and surface finish in a single pass, covering all aspects of analysis. Roundness and run-out of injector seating faces can also be measured down to sub micron accuracies with a high degree of confidence, helping to control the stringent processes required to produce injectors.
With regards to tighter tolerances on both the geometric form and surface finish of the fuel injector system and its associated components, of critical importance here are the concentricities of the seating face of both the pin and valve body in relation to their respective axis. Since the valve pin shaft fits with high precision into the valve body, the cylindricity of this shaft is critical as is the concentricity of its seating face to the shaft body, any errors in either would cause the pin to sit incorrectly in the valve body, resulting in bad fuel control and flow rate. To prevent this scenario certain measurements need to be made using high precision roundness systems, such as those available through CEMMNT. In particular, the Talyrond 395 has high accuracy datums with extremely accurate position control and the ability to automate the centering process to less than 0.2µm, making this one of the most accurate measurement systems available.
Wheel drum and brake disk
Controlling vibration in a wheel bearing or brake disk by eliminating lobing and chatter in the machining process or trying to ensure a brake pad has the necessary friction qualities to function correctly are all simple tasks with the correct equipment.
Critical to the function of a rotating component are its shape and form. Unwanted lobing or chatter on the flat area of a brake disk or on a wheel bearing will significantly affect performance. Critical features on a brake pad are its ability to provide the necessary friction when brakes are applied, alternatively too much friction may be detrimental. Through CEMMNT, customers are provided with a range of instruments to detect and help eliminate unwanted defects as well as predict the correct function of each component.
Although a relatively simple component, the brake disk has many features that require tight control. The disk faces should be parallel to one another and in turn, parallel to the wheel face mount, the faces should also contain no extreme changes in thickness variation. Brake surfaces should also be flat and square to the axis of the disk's rotation to a specified tolerance. As well as flatness, there should be no localised elements of lobing or chatter, or thickness deviations in segmented areas of the disk surface that effect the overall brake function.
Through CEMMNT, all of the above can be effectively and accurately controlled by using a combination of roundness measuring instruments in correlation with the appropriate Disk Brake Variation Software. Contact us today to discover how you can gain fast access to this service.
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Crankshaft & Camshafts
The Powerful measurement and analysis tools available to clients through CEMMNT allow measurement of many features, including the alignment and harmonic content of bearings and pins, parallelism of pins to mains, fillet radii, oil hole wash-out, bearing ratio and many other features. Depending on the size and weight of the cam or crankshaft, CEMMNT offer customers a number of options available based around a range of medium to large scale roundness instruments.
The wash-out on an oil hole on a crankshaft main bearing is also crucial for ensuring the smooth flow of oil about the bearing. The oil seal of a crankshaft should not have any spiralling marks that cause oil flow to travel in a single direction. Both wash-out and spiralling can be effectively quantifies by taking combined straightness traces taken at incremented angular positions on a Talyrond roundness instrument, the resultant traces can be combined to give a three dimensional image of the surface. Three dimensional analysis can give a clearer insight than conventional measurement and can therefore allow for defects or desirable elements in a components form or surface texture to be accurately and effectively quantified.
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Connecting rods
Possibly the most stressed parts of the engine under constant high load and subject to continuous changing forces are the connecting rods. With the small end connected to the piston wrist/gudgeon pin, and the larger end connected to the crankshaft, both the geometrical alignment and the surface quality and roundness of its bearing are crucial to good performance.
Critical to the function of any rotating component, particularly at high speed, are its shape and form. Unwanted chatter/lobing on a conrods bearing or misalignment will significantly effect performance. However, with the wide range of equipment available, CEMMNT enable clients to detect and help with the subsequent elimination of any unwanted defects such as those which affect surface quality.
The measurement of surface finish allows the user to predict the bearing qualities of the conrod's small and big-end or allow evaluation after use to check for wear or other defects caused during the engine life.
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