Mechanical Components

LM lubrication system gives a 20% increase in operating life

The QZ lubrication system developed by THK for its LM series linear motion guides, increases the operating life by 20% over the same LM guide lubricated with grease.

By combining QZ with grease lubrication, LM guides last 50% longer, typically 1,000km, carrying a heavy load of 18.6kN at a speed of 50m/min.

Under a light load, say 1.4kN at a speed of 300m/min, life expectancy is almost infinite, says the company, which suspended trials at 18,000km with no apparent loss of guide accuracy or efficiency.

The QZ system comprises a pair of blocks attached to opposite ends of the LM. These dispense oil to the ballrace from a fibre-filled receptacle. Yearly oil usage is 10cc compared with 600cc in a forced lubrication system under normal machine conditions.


The Guideline series of aluminium profile roller guides from Hoerbiger-Origa combine light weight and compact design with the ability to carry high loads at high speed over a long service life, as well as low inertia, low noise and low cost, says the company.

An important benefit of the aluminium rail, which has hardened steel precision guideways, is its ability to flex to compensate for the applied load, optimising load-carrying capacity.

It also has 10 times the tolerance to an uneven mounting surface when compared with ground steel slideways.


Linear and rotary motion modules available from RA Rodriguez meet the clean-room requirements of the food, pharmaceuticals and electronics industries where wear particles cannot be tolerated.

Easyline linear modules are rated for 30kg loads carried at high speed in stroke lengths up to 3.2m; they can be driven by two- or five-phase stepping motors attached to a precision toothed belt.

Kaydon series Reali-Slim rotary bearings target surface-mount production environments where the minutest of wear particles cause problems.

Coatings and balls can be supplied in non-ferrous metal to avoid contamination.


The Kuve monorail from Ina is a four-row recirculating ball bearing unit which gives up to a third longer interval between lubrication than standard units with which it is dimensionally interchangeable.

The 45 degrees contact angle on all four rows of balls means that the monorails can support high compressive, tensile and lateral loads and moments about all axes, says Ina.

There are six carriage designs and six sizes from 15mm to 45mm measured across the guideway. Kuve monorails carry dynamic loads up to 47,500N at speeds up to 300m/min.