Mac Marketing Corporation has introduced various ranges of bearings, clamping/locking assemblies, flow controllers and self lubricating bushes.

Combined bearings

The special kind of bearings called combined bearings which are widely used for combined radial and thrust load for linear motion applications have the following features:

• Combined bearings with inner ring made from bearing steel EN 31, SAE 52100 and outer ring made from case hardened steel UNI 16 Cr Ni 4.
• Combined bearings and profiles can also be supplied with special corrosion resistant coatings.
• Combined bearings are hardened and can take-up high axial and
• radial loads.
• These bearings are easily removable and can be re-lubricated.
• Profiles are made of high quality steel in UNIFE 510.C with maximum length of 12.000 mm.
• Combined bearings can be supplied with profiles and flanges duly welded.
• These bearings and profiles find application in material handling equipments, packing machines, mining equipment, steel mills, fort lifts, transport and conveyor system, etc.

Cone clamping/locking assemblies

Cone clamping/locking assemblies range from 10 mm to 60mm shaft dia. They are used as an economic solution for the shaft hub connection. These clamping assemblies are suitable for securing all types of hubs on shaft and axial. They efficiently replace shrink fit keys and polygon connections and they are also used for connection of gears, chain wheels, pulleys, etc.

The advantages of using clamping assemblies are easy adjustability, fastening without play for the transmission of torque, axial forces, longitudinal forces, easy removal and easy fitting.

The company now offers clamping assemblies with self-centring facility which eliminates the hassle of centring and axial fastening.

Hydrostatic PM-flow controller

Mac Marketing Corporation offers advanced technology from Hyprostatik GmbH, Germany, the leading manufacturers of hydrostatic PM-flow controllers which are used in machine tools and SPMs and have numerous advantages over capillary tube systems as under:

• 4-5 times higher stiffness with reduced oil demand.
• Reduced pump pressure and motor power due to higher efficiency
• Slideways allow adjustment of stiffness through preload
• Possible to manufacture threaded spindles with the same or higher stiffness than ball screws of the same size
• High axial load due to differential pressure up to 80 per cent of pump pressure
• In very high speeds, the spindles can run with very high loads
• Machines accuracies of up to half a micron and repeatability up to ten years
• Depression pockets increase further the stiffness of guide ways without holding strips and eliminating leakages of oil.

Hydrostatic PM-flow controllers find numerous applications for various machine tools such as CNC lathes, machining centres, grinding machines, precision machine tools, milling machines, measuring machines, all large machines, bearings and spindles, etc.

Low cost self-lubricating bushes

Oils multi-layered self-lubricating bearings come with a PTFE-filled over layer, a sintered bronze interlayer and a steel backing. These have been developed for applications in high load, and low speed operations. They are light-weight and thin-walled for easy handling, and are also known as DU bushes. These bushes have the following features:

• Self-lubrication
• Low friction co-efficient at high load, low speed operations with excellent wear resistance
• Operates under a wide temperature range, from -165oC to +280oC
• Satisfactory performance in rotating, oscillating and axial sliding motions
• Excellent dimensional stability, mechanical strength and thermal conductivity
• Thin-walled and light weight, construction for compact design
• Can be used for relatively in high speed operations with lubricating oil

These self-lubricating bushes find applications in textile, electronics, automobiles, pumps, machine tools, hydraulic and pneumatic cylinders, farm machinery, butterfly valves, fork lift trucks, etc.

Turntable bearings/slewing bearings

Mac Marketing Corporation offers a wide range of turntable bearings, also known as slewing ring bearings. They come in 4-point and 8-point contact ball types and with cross roller configurations, including wire race slewing ring.

These turn table bearings are available from bore diameter of 145 mm up to outside diameter of 6.500 mm with external and internal gear arrangement, sales and mounting holes in metric as well as inch dimensions. They find applications in radars, gun turrets, battle tanks, rocket launcher, robots, wind mills, antenna, nuclear reactor, construction equipment, cranes, steel plant, cement plant, paper mills, amusement parks, mining equipment, medical equipment, machine tools, water treatment plant, material handling equipment, foundry equipment, stacker reclaimers, earthmoving machinery, plastic extrusion plant, petro chemical equipment, wind tunnel, off-shore , aerial devices, etc.

The advantages of using clamping assemblies are easy adjustability, fastening without play for the transmission of torque, axial forces, longitudinal forces, easy removal and easy fitting.

Hydrostatic PM-flow controllers find numerous applications for various machine tools such as CNC lathes, machining centres, grinding machines, precision machine tools, milling machines, measuring machines, all large machines, etc.

For further details, please contact:

Mac Marketing Corporation, 14-A, Imperial Court, 33/1 Cunningham Road, Bangalore 560 052. Tel: 080-22200290/22386096; Fax: 080-22205895 Email: info@macmktg.com