Wide ranges of speeds are suitable for grease-lubricated bearing setups. Super-precision bearings may operate at reasonably high speeds without experiencing a significant temperature increase by being lubricated with the right amount of high-quality grease. Grease is more easily retained in a bearing arrangement than oil, particularly if shafts are inclined or vertical, hence the design of a bearing arrangement can be very simple when grease is used. Furthermore, grease can help seal the system against moisture as well as solid and liquid impurities. Get you preferred lubricant from ball bearing distributor near klongtom (ร้าน ขาย แบ ริ่ ง คลอง ถม, term in Thai).
Grease with a mineral base oil and a lithium thickener is appropriate for the majority of spindle applications with super-precision bearings. These greases can be utilized in applications where the temperature ranges from -30 to +110 °C (-20 to +230 °F) and stick well to the bearing surfaces. Grease using a synthetic base oil, has been shown to be effective for applications with high speeds, high temperatures, or where long service life is required. For the majority of operating circumstances, grease with an ester or mineral base oil and calcium complex thickener can be utilized for angular contact thrust ball bearings for screw drives. For any of the following circumstances, alternative greases may be necessary:
- Operating temperatures between 10 °C and 100 °C (210 °F)
- Bearing speed is extremely high or extremely low in static operation, there is little rotation or oscillation, there is vibration, and there are significant loads or shock loads applied to the bearings.
- It’s critical to be water resistant.
- Screw drive bearings should be greased with lithium soap grease with a mineral base oil and EP additives when operating at low speeds, under heavy loads, or when subjected to vibration.
- Four steps make to an appropriate grease choosing process.
Decide on a consistency grade
The National Lubricating Grease Institute divides greases into different consistency grades (NLGI). High NLGI grades are given to greases with a high consistency (stiff greases), whereas low NLGI grades are given to greases with a low consistency (soft greases).
Establish the necessary viscosity of the base oil
It has been discovered that employing greases with base oils of either low or extremely high viscosity results in a thinner oil coating than what is expected. High viscosity greases increase the friction and heat produced by the bearing but may be necessary in some situations.
- Determine whether EP additives are present
- In the event that super-precision bearings are put through any of the following circumstances, grease with EP additives may be appropriate:
- Massive loads (P > 0,15 C)
- Shock volumes
- Low speeds, static loading intervals, and many starts and stops throughout a work cycle
- Always use lubricants containing EP additives when necessary, and only at temperatures within their operating range.
Verify any further specifications
Operating circumstances may impose additional requirements
- Grease with a calcium thickener is preferable to grease with a lithium thickener for better resistance to water wash-out.
- Choose the right additive for effective rust protection.
- Choose grease with a high mechanical stability if there is a lot of vibration.