Abssac Ltd - Ball screw

Rolled Ball screw has larger end journal diameter using one piece of material!

Abssac is understood to be the first in the UK to supply a single piece, rolled ball screw that has a thread form right up to the end journal, which then has a diameter that is equal or greater than that of the screw thread diameter itself.

At first glance this innovation seems simple, but when you start to consider the limitations in thread rolling processes and take into account that previously it has been impossible to roll a thread on anything other than a single diameter bar stock, for the entire length of the screw, you start to see the great technological advance

Ball screws that have been cold rolled formed are ideal for applications that do not require the finite accuracy of the ground ball screw equivalents, but are still required to reliably transmit a linear load with high degree of accuracy.

Put simply, the rolling process forms a thread for less cost than grinding. However, we can still achieve accuracies of C7-20 (that's 52 microns per 300mm of lead accuracy - 20 microns of axial backlash).We have 30 years of experience in ball screws, to help guide you through the selection process to ensure the right part is chosen for the application. In a nut shell, the rolled ball screw ranges encompass;

• Precision rolled
• Low cost
• Lengths up to 3000mm
• Precision C7-20
• Lead accuracy .007mm/300mm or better
• 4mm to 15mm diameter screws
• Wide selection of leads and pitches available per diameter
• Miniature precision ranges
• Industrial heavy duty ranges
• Flanged, cylindrical and end threaded ball nut designs
• All parts can be supplied with journal ends machined and ready to fit application
• All Ball screws can be supplied with integrated radial and thrust bearings mounts
• ISO9001 approved
   

Utilising the recirculating ball bearing nut technology as the base of the product, the Industrial class ball screws encompass screw diameters from 16mm up to 80mm as standard. In many cases multiple ball circuits, per ball nut, are employed to achieve greater load capacities making the product suitable for many types of application.

As the name suggests, the range is aimed at the more industrial type application with dynamic load capacities from 900 to 13449 kgf being catered for. Whatever the load, it will be delivered with both high efficiency and low drive torque.

Stocked screw lengths of up to 3000mm are available up to 32mm diameter and screw lengths up to 4000mm long for screws above 40mm in diameter on request.

Offering the Industrial ball screw range converts rotary input into precise linear movement. All industrial ball screws can be delivered cut to length and if required, machined ready to fit into the required support bearing mounts.

Ball screws that have been formed by a grinding process are used where acute linear accuracy is paramount within the application. We offer a quality program of metric threaded screws, with a variety of ball nut combinations. The chart below details the diameters versus the available leads.

In March 2008 we launched a new end deflection series, which recirculates the ball bearings in the end plate of the ball nut. This design not only reduces the length of the ball nut but reduces the cost as well. The new FEB and FDB series are available in diameters of 6, 8, 10 and 12mm with leads ranging from 2.5 to 10mm. As standard this new series offers up to C3 lead accuracy and a full end machining capability.

Please also note that we offer the capability to supply customs designs to suit the application
 

The latest range of low-cost precision quality thrust and radial bearing units from Abssac are ideally suited for lead screw and ball screw applications. The complete thrust bearing kits contain the bearing housing, bearing set, cover, spacer, seal, locknut and set screw. We have Invested in large stocks which gives Abssac the advantage to supply same or next day pillow block and flange mounted bearing types that are interchangeable with leading brands at very competitive prices.

We stock and supply a complete range of support bearings that are suited for ball and lead screw operation. Available in both flanged and pillow block versions that cater for shaft sizes from 4mm up to 40mm.

BK Type - Thrust pillow block fixed

If you have an application where the control of volume in a liquid or gas is important, the edge welded bellows product may be able to help. Providing the most flex in the smallest amount of space, we are dedicated to developing and perfecting edge welded bellows design, fabrication and manufacturing technologies with full application design assistance.

• Using state-of-the-art manufacturing capabilities allows our customers to benefit from exact requirements.
• We excel at optimising the design and attachments so that we have consistently achieved outstanding performance and reliability reviews.
• For applications that require high quality micro fusion joining, edge welded bellows are more cost effective and functional than either electron beam or laser welding.
• we can weld any weldable alloy that is commercially available
• Hydraulically formed, or hydroformed, bellows can typically travel about twenty percent of their free length
• Bellows accumulators can have pressure internal or external to the bellows assembly
   

Industries to date that have benefited from this technology include:

• Vacuum Industry
• Semiconductor
• Aerospace
• Medical
• Military
• Oil and Offshore
• Solar Energy

Electroforms - Gold

• Drawing upon over 40 years of experience
• A new patent pending electroforming technology allows us to now supply solid gold electroforms
• This unique combination of properties makes gold a vital component in many medical, industrial, and electrical applications
• By refining the gold electroforming technique we can supply extremely intricate parts with unusual shapes, thin walls, deep crevices and other design features
• The electroforming process is especially crafted for tolerance-critical miniature parts and makes them suitable for both flexible bellows and rigid electroformed components
• The controlled electroforming process can also vary the wall thickness in different places on the same part for selective rigidity and flexibility allowing hollow parts with walls as thin as 0.0127mm (0.0005inch) for miniature applications including electrical bellows contacts and precision instrument applications.
   

The Rota-Cam Clutch

The Rota-Cam Clutch utilises the easily installed Roto-Cam®, which completely eliminates external, separately mounted fulcrums, yokes, levers or trunnions and permits a simple, clean compact control system for direct or remote, manual or powered actuation. Roto-Cam provides smooth easy engagement typical of a spring loaded clutch plus a positive, over-centre 'lock-in'. The clutch can be 'inched' or 'Jogged' for complete operator control.

• Simple design
• Smooth cam actuated engagement
• Sealed for dirty or dusty applications
• No lubrication required
• Separator springs
• Integral locking collar
• Installed without dis assembly
   

Lead screw (Precision)

Whether it is a simple lead screw or acme thread, Abssac has one of the largest linear product ranges to choose from. Combine this with a fast turnaround machine shop that can supply end journals that are ready to fit directly into your application, which ultimately reduces your scrap rate. Abssac is ready to help you find the right product for the right price.

• Abssac has expanded its lead screw ranges further by adding more diameters and leads per product range in 2009
• We now supply miniature diameters from 2mm up to the power screw ranges that start at 12mm and go up to a maximum of 200mm in diameter
• We supply both metric and imperial leads per diameter in both right and left hand formats
• Supplying, cold rolled, whirled, machined or ground style lead screw formats in stainless steel, low carbon steel and exotic materials if required, means that we have the linear device to suit all applications.
   

Leadscrews (Teflon Coated)

Lead screw applications often require Abssac to look at enhancements to the standard product in order that higher efficiencies or perhaps higher temperatures or duty cycles can be achieved without premature product degradation.

One such enhancement of the standard lead screw product is Teflon coating. Teflon by nature has some keen attributes in the world of linear motion apart from the obvious; having one of the lowest coefficients of friction of any solid material. For example, stainless steel products coated with Teflon ® fluoropolymer resins offer extremely hydrophobic properties and are completely resistant to hydrolysis. As a good barrier to water permeation; typical properties and dimensional stability remain unchanged even after year-long immersion in water.

At Abssac, we concentrate on the flanged mount and square mount versions of linear guides. These items are in stock and have proven to be the best linear guide solution when teamed up with any of our ball and lead screw products. Dimensional data for these models can be accessed by the buttons above but we do encourage you to contact our knowledgeable sales team who can help you with the right selection

Typical Guide applications include;

• Grinders
• NC Lathes
• Machining centres
• Precision milling
• Automation technology
• Transportation technology
• Measuring applications
• Machines that require a high level of positional accuracy
• Ideal for use with our Transport ball screw ranges

• Compression springs
• Extension springs
• Torsion springs
• Lateral translation springs
• Lateral bending springs
• Click Here to see more

Satellite roller screws are high precision linear devices, that faithfully transform rotary movement into a linear movement. By design they are similar to ball screws but with the difference that the ball bearings are replaced by threaded rollers, which are constantly engaged with the threads of the screw. The resulting higher number of contact points within the nut, means that both heavier loads can be accepted, product life is considerably elongated and extremely accurate linear positioning can be achieved

The key product advantages are:

• Heavy axial loads for a small diameter screw
• Nut designs with extreme long life
• High efficiency
• No-backlash standard high stiffness linear precision up to 6 µm / 300 mm
• Can accept a high rotary speed (system RV and BRV without roller return type)
• Extremely small leads can be supplied on large diameter screws (system RVR with roller return design)
   

The self-reversing screw product does not require the driven screw to change its direction of rotation to enable the nut to return to its original start position. The reciprocated bi-directional movement is achieved by using a follower blade in the nut, that is matched to the particular groove width and screw turn round on the screw. (Our self reversing screws, do not utilise ball bearings in their linear travel).

• There is not a standard range of this screw type as all designs are manufactured to meet the customer's individual specification
• They can be created in just about any mild steel, stainless steel, bronze or Aluminium

Key product advantages are

• Backlash free operation
• Torque range : 18 to 5000 Nm
• Torsionally stiff
• Maintenance free
• To suit shaft sizes from 1mm to 100mm (H7)
• Suitable for high temperatures from -30C to +120C
• Corrosion resistant

One of the greatest advantages of the specialist flexure beam product is in its ability to adapt into applications where simply others can not follow. Whether it is a standard shaft coupling with unusual shaft attachment requirements or a design that requires a high degree of angular offset, the specialist flexure product can help solve your rotational challenges .

The specialist flexure is determined by six major characteristics:

• Flexure outside diameter
• Flexure inside diameter
• Coil thickness
• Material
• Number of coils
• Number of coil starts
   

Key product advantages as as follows

• To suit torques from 5 to 50,000 Nm
• To suit shaft sizes from 10mm to 55mm
• Backlash free
• Torsionally rigid
• Flexible disc couplings minimize the misalignment forces on the connected equipment.
• EC Standard 94/95 versions
• EC (ATEX95) belonging to 2G/2D versions
• Suitable for hazardous environments (up to 280C)
• Laminated disc packs are pre-stressed to eliminate axial vibrations of spacer designs
• Ideal for applications such as centifugal pumps, fans and screw compressors
   

Key product advantages

• One piece construction
• Standard bores from 2mm to 44mm (0.090 inch to1.750 inch)
• Compensates for angular, parallel, skewed and axial shaft offsets
• Metric and imperial model versions
• Integral clamp and set screw attachment styles
• Zero backlash torque transmission
• Bore combinations metric and imperial and custom
• Limitless shaft attachment designs - See specialist couplings
• Constant velocity and zero vibration when offset
• High fatigue resistance-low radial loads
• Low bearing loads
• Bi-directional torque transmission
• Stainless steel and aluminium versions
• Internal bore relief as standard
• Fit and forget
• Short delivery
• Non magnetic versions
• Vacuum environment compatible products
   

The curved jaw coupling design consists of an elastic “spider” and two hubs. The spider, made of an advanced polyurethane material, provides dampening of impulse loads, minimizing shock to the motor and other sensitive equipment. These spiders allow the user to customize the jaw coupling’s performance. Selecting a soft spider will give the jaw coupling the greatest dampening characteristics, while a hard spider will provide the greatest torque capacity and strength. The jaw coupling can also be considered as a fail safe device. If the spider fails, the jaws of the two hubs interlock allowing direct power transmission, allowing the application to be safely shut down for maintenance.

L Jaw couplings are designed to meet high-quality standards whilst remaining affordable. We offer two Jaw-type Elastomeric couplings: a straight L-Jaw coupling available with four insert materials designed for various application torque loads.

• To suit shaft diameters 3mm to 70mm
• Both are 100% interchangeable with industry-standard designs.
• L-Jaw offer reliable solutions for uniform to heavy loads
• L-Jaw uses easily replaceable individual cushions for maximum reliability with heavy torque loads.

Ideal solutions for applications ranging from standard-duty electric motors to steam turbines and high-torque motors. They are available in a wide range of sizes using BTS (bored to suit) hubs. The spiders are available in Burna-N, Urethane, Hytrel and bronze.

Key product advantages;

• Low cost - High quality
• No maintenance
• Accept parallel and angular shaft misalignment's
• High torsional stiffness
• Accommodate axial compression
• Zero backlash torque transmission
• Provides thermal and electrical insulation between shafts
• Exceptional durability
• Trouble free set screw attachment to shaft
• Large variety of bore combinations 1.5mm to 12.00mm
• Constant velocity torque transmission under shaft offsets
• Low radial loads
• Low inertia
   

Rigid couplings are available as standard in aluminium alloy, steel and stainless steel. For smaller shaft sizes the new SC series clamping method that ensures the concentricity of the clamped shaft. Suited to shaft sizes from 5mm to 12mm, including imperial and custom formats, make the new SC series ideal for applications where high torque and exceptional torsional stiffness are required.

• Exceptional torsional stiffness
• High torque capacity
• Metric and Imperial bore formats
• Integral clamp shaft attachment
• Aluminium or stainless steel versions
• To suit shaft sizes of 5mm to 50mm
   

4-way flexing action absorbs virtually all types of shock, misalignment, and end float. With Sure-Flex couplings, the need for lubrication and maintenance is also eliminated. As a result, these couplings provide clean, dependable, and quiet performance for a variety of applications.

• Four-way flexing action absorbs extreme torsional shock and vibration
• Uniquely designed teeth and lateral flexibility accepts both parallel and angular misalignment without wear
• Fast and easy installation without bolts, gaskets, covers or seals
• Lubrication-free design provides quiet, reliable performance
• Flexible sleeves available in EPDM, Neoprene and Hytrel
• Choose from an extensive range of sizes, using BTS, bushed, clamp and spacer flanges
• To suit shaft sizes from 10mm to 140mm, with keyways