Fittolerance

Acoem’s classic shaft alignment systems feature a proprietary display unit that connects with our bluetooth laser alignment sensors.

What began as a mechanical workshop in Sweden in 1984, evolved to become an international leader in laser-based shaft alignment for rotating assets. Acoem developed the world’s first shaft alignment tool with integrated software that calculated measurement values with visible red laser and additional functionality, such as measurement of straightness, perpendicularity and parallelism.

②Because the tolerance value of the bearing outer diameter is different from the general reference shaft, it is also a special tolerance zone. In most cases, the outer ring is fixed in the housing hole, and some bearing components need to be adjusted according to the structural requirements, and their coordination is not suitable. Too tight, often cooperate with H6, H7, J6, J7, Js6, Js7, etc.

Interference fit

The equivalent radial load P is divided into "light", "normal" and "heavy" loads. The relationship between it and the rated dynamic load C of the bearing is: light load P≤0.06C normal load 0.06C

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Precision laser shaft alignment tools make the process of measuring and correcting misalignment of your machinery easier, more accurate and repeatable. With the right technology, novices and experts alike can make informed decisions and operate machinery with greater efficiency, minimising wear, production stoppages and unnecessary costs.

Even the smallest angle misalignment can reduce the lifespan of your components by 50%. To avoid this scenario and keep your machinery running efficiently, you need to proactively undertake precision alignment as part of your maintenance program to save your business both time and money. With Acoem task-oriented laser shaft alignment tools, you can be confident that your machinery will be aligned quickly, easily and accurately every time, with all the guidance you need available via your tablet or smartphone.

The matching accuracy level is generally selected at level 6. Sometimes it depends on the material and processing technology. In theory, level 7 is a bit low, and if it is matched with level 5, grinding is required.

We offer a range of precision laser shaft alignment tools and packages to suit a variety of applications, budgets and expertise, from simple entry level, no frills devices to augmented mechanics Cloud-based connected systems.

The tolerance class of the shaft or housing bore that fits the bearing is related to the bearing accuracy. For the shaft matched with the P0 grade precision bearing, the tolerance level is generally IT6, and the bearing seat hole is generally IT7. For occasions with higher requirements on rotation accuracy and running stability (such as motors, etc.), the shaft should be IT5 and the bearing seat hole should be IT6.

Fit tolerance is the sum of the hole and shaft tolerances that make up the fit. It is the amount of variation that allows clearance to interference.

We were pioneers in the use of touchscreens with icons and graphics for industrial instruments in the mid-1990s and introduced wireless sensors in the mid-2000s. We have continued to design and manufacture cutting-edge, user-centric alignment solutions that require minimal set-up time and utilise application software that empowers mechanics and maintenance teams. We remain committed to focusing on digitalisation, ease of use and accessibility for our customers worldwide.

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We offer a range of precision laser shaft alignment tools and packages to suit a variety of applications, budgets and expertise, from simple entry level, no frills devices to augmented mechanics Cloud-based connected systems.

The size of the tolerance zone and the position of the tolerance zone for the hole and shaft make up the fit tolerance. The size of the hole and shaft fit tolerance indicates the fit accuracy of the hole and the shaft. The size and position of the hole and shaft fit tolerance zone indicate the fit accuracy and fit nature of the hole and shaft.

① When the bearing inner diameter tolerance zone and the shaft tolerance zone form a fit, the tolerance code originally belonging to the transition fit in the general base hole system will become the over-win fit, such as k5, k6, m5, m6, n6, etc., but the over-win amount is not Large; when the bearing inner diameter tolerance is matched with h5, h6, g5, g6, etc., it is not a clearance but an over-win fit.

For the housing bore tolerance zone for radial and angular contact bearings, refer to the corresponding tolerance zone table. When selecting, pay attention to avoid clearance fits for outer rings that oscillate or rotate in the direction of load. The size of the equivalent radial load also affects the fit selection of the outer ring.

For the tolerance zone of the shaft on which radial and angular contact bearings are mounted, refer to the corresponding tolerance zone table. For most occasions, when the shaft rotates and the radial load direction does not change, that is, when the bearing inner ring rotates relative to the load direction, a transition or interference fit should generally be selected. When the shaft is stationary and the radial load direction is unchanged, that is, when the inner ring of the bearing is static relative to the load direction, transition or small clearance fit can be selected (too much clearance is not allowed).

Misalignment is the root cause of upwards of 50% of all rotating asset failures, including lubrication issues from seal cracks and bearing faults. Studies indicate that it is also responsible for a 3-10% increase in energy consumption, translating to significant additional costs over your machine’s lifetime.

Attachment: Under normal circumstances, the shaft is generally marked with 0~+0.005. If it is not often disassembled, it is +0.005~+0.01 interference fit. If you want to disassemble frequently, it is a transition fit. We also need to take into account the thermal expansion of the shaft material itself during rotation, so the larger the bearing is, the better the clearance fit is -0.005~0, and the maximum clearance fit should not exceed 0.01. Another one is the interference of the moving coil and the clearance of the static ring.

Bearing fits are generally transition fits, but interference fits are optional in special cases, but rarely. Because the cooperation between the bearing and the shaft is the cooperation between the inner ring of the bearing and the shaft, the base hole system is used. Originally, the bearing should be completely zero. We can also think so in actual use, but in order to prevent the inner ring of the bearing and the shaft When the minimum limit size is matched, the inner ring rolls and damages the surface of the shaft. Therefore, our bearing inner ring has a lower deviation tolerance of 0 to several μ to ensure that the inner ring does not rotate. Therefore, the bearing generally chooses transition fit, even if Even if the transition fit is selected, the interference should not exceed 3 wires.

Simple, easy operation with advanced features and capabilities, including geometric measurements. The ultimate in shaft alignment tools.

Unless there is a special need, the bearing seat of the rolling bearing generally adopts an integral structure. The split bearing seat is only used when there is difficulty in assembly, or when the advantage of convenient assembly becomes the main consideration, but it cannot be used for tight fit. Or a more precise fit, such as K7 and a tighter fit than K7, or a seat hole with a tolerance class of IT6 or more, shall not use a split housing.

Not only is precision laser alignment crucial to protecting the operational efficiency and life expectancy of your rotating machinery, it also reduces stress on your equipment and helps avoid unexpected failures which may cause full process shutdowns or safety incidents.