LM Guide Models for Special Environments Medium-to-Low Vacuum Model HSR-M1VV

Features

• Operable in various environments at pressure between atmospheric pressure and vacuum (10 ^-3 [Pa]).
• Capable of withstanding baking temperature up to 200°C ^*
• Use of a newly developed labyrinth end seal dedicated for Medium-to-Low Vacuum increases grease retention and allows extended use in vacuum.
• Use of grease designed for Medium-to-Low Vacuum achieves a stable rolling resistance.

* If the baking temperature exceeds 100°C, multiply the basic load rating with the temperature coefficient.

Structure of the labyrinth end seal dedicated for Mediumto-Low Vacuum

The labyrinth end seal dedicated for Medium-to-Low Vacuum forms a multi-stage space as shown in the figure on the right to minimize the pressure difference between adjacent stages. This reduces the out-flow velocity of the oil inside the LM block to a minimum. In addition, the seal will not affect the rolling resistance since it does not contact the LM rail.

Achievable vacuum level

The LM Guide for Medium-to-Low Vacuum demonstrates an excellent achievable vacuum level.
[Test conditions] Temperature: 25°C (±5°C)

	HSR15M1RVV	HSR15R (for reference)
Grease	Grease for Medium- to-Low Vacuum	AFB-LF Grease
Seal	Labyrinth end seal dedicated for Medi- um-to-Low Vacuum	None
Endplate	Stainless steel	Resin

Achievable vacuum level

Rolling resistance

The grease used in the LM Guide for Medium-to-Low Vacuum has a smaller rolling resistance than conventional fluorine grease and ensures stable rolling motion.
Specimen: HSR15M1RVV
Temperature: 25°C (±5°C)
Pressure: atmospheric pressure

Rolling resistance fluctuation

If a large moment is applied to a system consisting of one LM rail or one LM block per shaft, the labyrinth end seal may contact the LM rail, which could affect the system’s motion. If a moment is applied, it is recommended to use two rails with two LM blocks per rail. Contact THK for details.