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Top Questions asked by our customer

 1.  How to chose the right replacement for motor gear units?

Motor gear units vary considerably from one model to the next. Any replacement offered is unlikely to be identical to the original and should therefore be provided with a certified drawing for the customer (from the manufacturer) to check every dimension and performance criteria is a match. Queries like this often require expert technical support from an experienced mechanical and an electrical engineer after the application has been analysed. In which case a solution for the customer may involve a redesign of the mounting or the coupling etc etc.

2. A bearing with a service temperature rating which is very high and in excess of normal service parameters.

The bearing could be overheating because of a problem elsewhere on the customers application, it is only possible to assist the customer with expert technical support from an experienced mechanical engineer after his application is analysed. In which case a solution for the customer may be for example, to introduce cooling on his bearing application and/or select a higher temperature lubricant.

3. What is a Class L bearing guide shaft?

A Class L bearing guide shaft (class L refers to the diameter tolerance on the shaft and may be specific to this manufacturer since shaft diameters are usually referenced by their actual size and tolerance).

Tech support should be able to solve this.

4. What means dual use for SKF vibration sensor CMSS 2100?

Dual use in this instance refers to dual output vibration and temperature. The unit with both features is referenced CMSS 2100T in the SKF catalogue. I don't know if dimensions or features change between the single output and dual output units without further comparison.

Note, that CMSS 2100 is not dual output, however CMSS 2100T is dual output.

5.  Question about a viton seal for a 6211 bearing order.

If could not find a viton sealed bearing with this reference number, if it exists it may be a special. A point to note with Viton/FKM is the hazards associated with temperatures above 300 °C (570 °F), all fluoro elastomers and PTFE compounds give off dangerous fumes. Cooling and or shielding may be required on customers application to reduce temperature below this level.

Ordinarily when an integral seal is unavailable the designer would incorporate an external sealing arrangement for the bearing in its housing.

11. What are bearing suffixes?

Bearing suffixes are generally universal, (although some manufacturers may apply suffixes specific to them or one of their bearings. It is best to check with the particular manufacturer’s reference to be certain). I could compile a list of bearing suffixes for call agents if required. C3 is the radial clearance within the bearing. E suffix denotes increased load capacity for the bearing. This means if this bearing is replaced with a standard bearing, it will not last as long in service, (the difference in life span would be drastically reduced).

8 or 10 balls would make a difference to a bearing, we would need to check the specification from manufacturers data sheet for the two types.

12.  Where to pay attention to when ordering transmission chain?.

When ordering transmission chain, it is usual to list the chain pitch, chain type, number of chain pitches and overall length. For complex chains/ends a drawing would be provided from an industrial customer to confirm type to supplier. It is a little confusing to select a chain with specific ends in a verbal manner. Tech services would be better suited to help here and would need to refer to a drawing.