Cross-Roller Ring Handling Precautions

Handling

Please use at least two people to move any product with a mass of 20 kg or more, or use a cart or another method of conveyance. Otherwise, it may cause injury or damage the unit.
Inner or outer rings that are split into two pieces are kept together by special rivets or by bolts and nuts, so please install the product as-is. The improper installation of a spacer cage in a cross-roller ring greatly impacts its rotational functionality. Please do not disassemble the cross-roller ring.
Take care not to drop or strike the cross-roller ring. Otherwise, it may cause injury or damage the unit. Even if there is no outward indication or damage, a sudden impact could prevent the unit from functioning properly.
Wear appropriate safety gear, such as protective gloves and safety shoes, when handling the product.

Precautions on Use

Prevent foreign material, such as cutting chips or coolant, from entering the product. Failure to do so could damage the product.
If the product is used in an environment where cutting chips, coolant, corrosive solvents, water, etc., may enter the product, use bellows, covers, etc., to prevent them from entering the product.
Do not use the product at temperature of 80℃ or higher. If used above this temperature, there is a risk that the resin and rubber parts may deform or become damaged.
If foreign material such as cutting chips adheres to the product, replenish the lubricant after washing the product.
Slight oscillations can inhibit the formation of an oil film between the raceways and the area of contact for the balls, resulting in fretting. We recommend periodically rotating the cross-roller ring several times to help ensure that a film forms on the surfaces and rolling elements.
Do not forcibly drive a pin, key, or other positioning device into the product. This could create indentations on the raceway and impair the product's function.
Because it is possible that the seam for the inner or outer ring could be slightly off-center, slightly loosen the bolts securing the inner or outer ring and correct with a plastic hammer before inserting into the housing. (The securing rivet will adjust to the housing.)
When installing the cross-roller ring onto a housing, if the inner ring is fixed, hammer the inner ring to insert it. If the outer ring is fixed, hammer the outer ring. Hammering the non-fixed side may cause damage to the unit.
If an attached component is insufficiently rigid or mounted incorrectly, the bearing load will be concentrated at one location and performance will decline significantly. Therefore, carefully consider the rigidity and accuracy of the housing and base, and the strength of the securing bolts.
Avoid applying force to the securing rivets or bolts when installing or removing.
Be careful of the dimensional tolerances of the mounting components to ensure that the presser flange firmly holds the inner anda outer rings from the sides.

Lubrication

Do not mix different lubricants. Even greases containing the same type of thickening agent may, if fixed, interact negativery due to disparate additives or other ingredients
When using the product in locations exposed to constant vibrations or in special environments such as clean rooms, vacuums, and extreme heat or cold, use a lubricant suitable for its use/environment.
The consistency of grease changes according to the temperature. Please keep in mind that the torque of the cross-roller ring may be affected by changes in viscosity.
Since the cross-roller ring unit contains high-quality lithium soap-based grease No. 2, you can start using the product without replenishing grease. However, the product requires regular lubrication, since it has a smaller internal space than ordinary roller bearings and because the rollers need frequent lubrication due to their rolling contact structure.
To replenish grease, it is necessary to provide greasing holes that lead to the oil grooves formed on the inner and outer rings. Regularly resupply grease of the same type so that it is distributed throughout the interior of the bearing at least every three to six months. The final lubrication interval/amount should be set at the actual machine.
When the bearing is filled up with grease, the initial rotational torque temporarily increases. However,surplus grease will run off of the seals, and the torque will return to a normal level after a short period of time. Because the thin type does not have oil grooves, please lubricate by providing oil grooves on the inner diameter of the housing.
Excess grease may protrude from the outside edge of the cross-roller ring. The structure of peripheral components will require careful consideration if contamination due to grease around the edges of the device is a concern.

Storage

When storing the cross-roller ring, pack it as designated by THK and store it indoors in a horizontal position away from high or low temperatures and high humidity.
Please note that if the product has been kept in storage for an extended period, the lubricant inside may have deteriorated. Please ensure that you replenish the lubricant before use.

Disposal

The product should be treated as industrial waste and disposed of appropriately.