Machined springs meet the needs of downhole measurement system

Abssac has developed a machined spring design for a customer needing to measure a compressive/tensile load of over 22kN in a very constrained spatial envelope.

Oil and gas exploration applications are, in many ways, similar to those involving equipment destined for the planet Mars: it is in a place that is inaccessible, toxic and has a corrosive environment; a place where equipment failures cannot be tolerated.

This is exactly why Abssac is having great success with its machined spring product because of its performance characteristics and proven reliability. In many of the applications within this industry a spring system is required to accurately store energy, deliver a constant force, accurately measure for deflection or perhaps act as a fail-safe component.

Wire wound springs are often used for these applications, incorporating brazed end attachments such as tangs or ground captivated end seats. In each case a single spring coil is utilised and, by the nature of the wound wire design, they have some performance limitations.

Many advantages of machined springs

Image
Abssac has had many years' experience supplying its alternative to the wire wound spring called the Heli-Cal Machined Spring. By taking a spring design that has been subjected to FEA (finite element analysis), and machining this form into a solid piece of material, it is possible to create compression, single-piece extension, torsion and lateral springs that have very predictable and accurate performance characteristics. The machined spring can deliver a predicated linear force in any of the spring formats. In some cases, and depending on the geometry of the spring design, the tolerance on the spring rate can be as good as +/-1 per cent. Since the parts are machined, it is then simple to incorporate end attachments into the design, which can permit pure moment attachment.

Most importantly, the machined spring product can offer multi-start springs within the single-piece spring component. Offering single-, double- and triple-start configurations as standard, the product delivers exceptional performance characteristics that are unobtainable by using wire wound springs. For example, in compression, a double- or triple-start spring significantly unifies the lateral bending and lateral translation forces and moments around the spring's circumference given a lateral deflection. In the torsional mode, the machined spring can allow pure moment attachment, by incorporating specific end attachments into the single-piece design. When using integral tangs, the machined spring is without the relative stresses this type of connection can harbour.

Offering a choice of materials such as stainless steel or titanium, as well as other exotic alloys, adds strength to the argument that machined springs are a formidable product that can be used where reliability and performance are paramount.

Downhole application

Image
A recent application called for a machined spring to be used as part of a load measuring system within a downhole tool for the oil and gas industry. The requirement was to measure a 22,241N (5000lb) compressive/tensile load. The maximum operating temperature was 200degC and the springs would be exposed to corrosive bore hole fluids. In addition to coping with this harsh environment, the actual spring would have to perform within a very constrained space envelope that determined the diameter of the spring - though length was not an issue.

The final design used three machined springs attached end-to-end to achieve a 10mm deflection for 22,241N (5000lb). The springs are constrained within a tube and the +/-10mm of linear movement is measured with a precision potentiometer.

Test results

Samples for test and evaluation were manufactured with a spring coil geometry designed to deliver the compression spring characteristics required. Two materials were used for the test samples, one using a 17-4ph stainless steel providing an axial spring rate of 6370N/mm with a variation on rate of +/-10 per cent between 0.10mm and 0.60mm compression from free length. This lower load test and rate performance theoretically proved that the required spring performance at the higher loadings would be possible. With the confidence gained from the initial tests, the maximum loading test were then carried out at the customer's premises within a test rig.

At the same time another identical spring was produced using a CC445 stainless steel, which provided the same rate and performance of +/-10 per cent, but this was to be used to compare spring rate tolerance over time in a higher-yield material. In each case the spring design incorporated a thread turned on one end and a tapped hole at the opposite end so the three springs could be assembled together to form a the final single spring system, with a total length of 650mm.

Peter Wright at Abssac states: "Whether it is a new spring application or an enhancement of an existing spring design, the machined spring product is relatively unknown by design engineers and yet has so much to offer. Many of our applications are in critical application areas where reliability, and longevity of performance are requisites."

Follow the link for more information about machined springs from Abssac.

Abssac

E1A The Enterprise Centre
Enterprise Way
Evesham
WR11 1GS
UNITED KINGDOM

+44 (0)1386 421005

sales@abssac.co.uk

www.abssac.co.uk

More from Abssac

ETP-EXPRESS hydraulic bushes are quick to mount and dismount

Posted 2 weeks ago

Metal bellows - an enabling technology for many applications

Posted 6 months ago

Everything you need to know about lead screws

Posted 7 months ago

Movie of the month

Posted 8 months ago

How shaft-hub connections have evolved

Posted 8 months ago

Abssac virtual and interactive exhibition is open all hours

Posted 8 months ago

Standard and custom miniature precision lead screws

Posted 8 months ago

Movie of the month

Posted 1 year ago

High-precision satellite roller screws from a UK source

Posted 1 year ago

Compact torque limiters protect critical equipment

Posted 1 year ago

Ball screws and lead screws from stock or fully customised

Posted 1 year ago

Reliable emergency braking and holding during power outages

Posted 2 years ago

Movie of the month

Posted 2 years ago

Miniature safety brakes are super-slim and energy-efficient

Posted 2 years ago

Movie of the month

Posted 3 years ago

Expertise in rotary products

Posted 3 years ago

Abssac to distribute Helix Linear Technologies' products in UK

Posted 3 years ago

Movie of the month

Posted 3 years ago

An insider's view of Abssac's precision linear products

Posted 3 years ago

Movie of the month

Posted 4 years ago

A day in the life of Abssac - experts in precision motion

Posted 4 years ago

How to select the right shaft coupling for a rotary encoder

Posted 4 years ago

Movie of the month

Posted 4 years ago

Abssac's miniature ball screws at the Engineering Design Show

Posted 4 years ago

How machined springs out-perform wire-wound springs

Posted 4 years ago

Spinplus shaft coupling suits highly dynamic applications

Posted 4 years ago

Carbon Composite Bellows Springs provide compressive tunability

Posted 4 years ago

Movie of the month

Posted 6 years ago

Extension and compression springs machined from solid material

Posted 6 years ago

Movie of the month

Posted 6 years ago

Schmidt-Kupplung shaft couplings handle severe parallel offsets

Posted 6 years ago

Movie of the month

Posted 6 years ago

Movie of the month

Posted 6 years ago

Shaft-hub connection saves set-up time on food conveyor

Posted 6 years ago

Satellite roller screw from Abssac

Posted 6 years ago

Stainless steel Schmidt-Kupplung shaft couplings

Posted 6 years ago

Movie of the month

Posted 7 years ago

Precision miniature cold rolled lead screws and nuts

Posted 7 years ago

Machined compression and extension spring replaces wire spring

Posted 7 years ago

Custom-designed flexible beam coupling for encoder application

Posted 7 years ago

Semiflex precision offset couplings used in glass coating system

Posted 7 years ago

Movie of the month

Posted 7 years ago

Miniature lead screws are cost-effective and high-performance

Posted 7 years ago

Self-reversing machined screws manufactured to order

Posted 7 years ago

Precision ball screws used in electronic microscope

Posted 7 years ago

ETP-POWER shaft-hub connection achieves higher clamping loads

Posted 8 years ago

Edge-welded bellows used in NASA's cryogenic chambers

Posted 8 years ago

Movie of the month

Posted 8 years ago

ABSSAC Movie

Posted 8 years ago

Constant-velocity shaft couplings for encoder applications

Posted 8 years ago

Easy-to-use ETP hydraulic hub-shaft connections from Abssac

Posted 8 years ago

High-accuracy springs for high temperatures

Posted 8 years ago

Shaft couplings match the needs of printing machinery

Posted 8 years ago

Movie of the month

Posted 8 years ago

Shaft coupling used for aerator device in oxygenation of water

Posted 8 years ago

Ball screws, trapezoidal screws and satellite roller screws

Posted 8 years ago

Semiflex shaft couplings suit large parallel shaft offsets

Posted 8 years ago

Movie of the month

Posted 9 years ago

Jaw shaft couplings stocked with pre-machined bores and keyways

Posted 9 years ago

Movie of the month

Posted 9 years ago

Schmidt-Kupplung shaft couplings available from Abssac

Posted 9 years ago

Custom split nut reduces machine cycle time

Posted 9 years ago

Lead screw and nut assemblies for high-vacuum applications

Posted 9 years ago

Miniature lead screw provides precision and reliability

Posted 10 years ago

Movie of the month

Posted 10 years ago

Movie of the month

Posted 10 years ago

Shaft couplings supplier offers extensive range plus expertise

Posted 10 years ago

Ball screw supplier offers wide choice and competitive prices

Posted 10 years ago

Plastic ball screw and nut assembly in a choice of polymers

Posted 10 years ago

Pitch preparation advice and tips from Abssac

Posted 10 years ago

Movie of the month

Posted 10 years ago

Motion products backed up by expert technical support

Posted 10 years ago

Helical Flexures compensate for high angular misalignment

Posted 10 years ago

Pancake-shaped compression springs machined from solid

Posted 10 years ago

Abssac contact details change with move to new premises

Posted 10 years ago

Machined torsion springs offer advantages over wire types

Posted 11 years ago

Sure-Flex elastomeric shaft couplings are maintenance-free

Posted 11 years ago

Movie of the month

Posted 11 years ago

Miniature ball screws: precision standard or custom units

Posted 11 years ago

Movie of the month

Posted 11 years ago

Ball screws and nuts for machine tool refurbishment

Posted 11 years ago

Movie of the month

Posted 11 years ago

Satellite roller screws and their inherent advantages

Posted 11 years ago

Shaft couplings used in one-piece, multi-functional components

Posted 11 years ago

Ball screws offer advantages of rolled and ground types

Posted 11 years ago

Trapezoidal lead screws from stock, with free cutting service

Posted 11 years ago

The benefits of helical beam shaft couplings

Posted 11 years ago

Movie of the month

Posted 11 years ago

Test movies for abssac

Posted 11 years ago

Choosing lead screws, ball screws and satellite roller screws

Posted 11 years ago

Movie of the month

Posted 11 years ago

Helical flexure used in self-aligning, long-life die cutter

Posted 12 years ago

Atherm bellows compensate for temperature changes

Posted 12 years ago

Budgetbeam shaft coupling offers high torsional stiffness

Posted 12 years ago

Abssac website includes new products and animations

Posted 12 years ago

Acme and trapezoidal lead screws from a UK supplier

Posted 12 years ago

Bespoke lead screws and nuts manufactured to order

Posted 12 years ago

Cut the cost of precision ball screws

Posted 12 years ago

Budgetbeam flexible shaft couplings available to buy online

Posted 12 years ago

How flexible is your supplier of shaft couplings?

Posted 12 years ago

What are the advantages of machined springs?

Posted 12 years ago

Ultra-fine-pitch lead screws for precise movements

Posted 12 years ago

Deck gear couplings and Sier Bath Deck gear couplings

Posted 12 years ago

Roller screws deliver four-times higher thrust

Posted 12 years ago

UK source for TB Wood's power transmission products

Posted 12 years ago

More sizes of lead screw, acme thread and ball screw

Posted 12 years ago

Self-reversing lead screws manufactured in short lead times

Posted 12 years ago

Helical beam drive combines three parts in one

Posted 12 years ago

Miniature ball screws are diameter 1.8mm

Posted 12 years ago

Free shaft couplings for test purposes

Posted 12 years ago

Customised lead screws are economical for linear motion

Posted 12 years ago

Electroformed spring contacts provide reliable connections

Posted 12 years ago

Stainless steel ball screws are precise and cost-effective

Posted 12 years ago

Abssac wins Pharmatex innovation award

Posted 12 years ago

Double-handed lead screws need no lubrication

Posted 12 years ago

Edge-welded bellows deliver flexibility in a compact package

Posted 12 years ago

Couplings help cut energy consumption - and carbon footprint

Posted 13 years ago

Splined shafts available in very large sizes

Posted 13 years ago

Bi-directional ball screws move nuts in opposite directions

Posted 14 years ago

Leadscrews offered with custom nuts for standard prices

Posted 14 years ago

Advantages of electrodeposited nickel bellows and electroforms

Posted 14 years ago

Satellite roller screws offer benefits over ball screws

Posted 14 years ago

More applications
6 hours ago
Certified Machinery Safety Expert course on 18th January
In conjunction with TÜV NORD, Pilz Automation UK is hosting its first CMSE Course of 2021. It starts on 18th January and lasts for four days
7 hours ago
Improving communication with (and between) machines
Lenze has published a White Paper discussing PackML, a programming standard defined by OMAC, the Organisation for Machine Automation & Control. Here, Lenze's Marc Vissers provides machine builders with an insight into the paper
9 hours ago
Danfoss buys Artemis Intelligent Power
Danfoss says it will allow them to begin the global commercial rollout of its Digital Displacement® pump technology, a disruptive low-carbon opportunity with applications in the industrial and off-highway markets
1 day ago
Quarter turn fastener that still turns heads
Automotive manufacturers are gradually making the transition from solely manufacturing vehicles to taking on more responsibility for the performance of a vehicle over its life cycle. As a result, OEMs are increasingly looking for ways to lower installation costs, and facilitate quick repeatable access to critical vehicle components in order to enable faster service calls
1 day ago
Wave spring or coil spring?
Simon Ward is Technical Manager at Uckfield-based fastener specialists TFC. Here he offers a machine designers a comparison between wave springs and round wire coil springs 
1 day ago
New course: Safety Design Incorporating EN ISO 13849-1/EN 62061
Pilz Automation UK says that this training course is designed to enable delegates to develop a greater understanding of the processes and standards related to safety control system specification, design and validation
2 days ago
Intelliconnect moves to larger factory as sales grow
Intelliconnect (Europe) Ltd has moved to a larger facility at the Corby Innovation Hub
2 days ago
ABB industrial robots get Wizard programming
ABB is expanding it Wizard easy programming tool to encompass its industrial robot range, saying that it makes robots easier to install, programme and operate without specialised training
2 days ago
New Siemens Sivacon S8 Power Partner appointed
Nottingham-based manufacturer of bespoke LV control systems Blackburn Starling has become a Siemens Sivacon S8 Power Partner
2 days ago
Drive systems enhance rehabilitation technology
maxon Group and Fourier Intelligence have announced a global partnership. maxon's precision drive systems and Fourier' Intelligence rehabilitation robotics will combine in the development of new technologies for patients