Precision thin section bearings ensure rigidity and repeatability of camera motion control rigs

A UK-based designer and manufacturer of robotic motion control systems for live broadcast, film and photography applications, is utilising Silverthin® precision thin section bearings from Carter Manufacturing on a variety of its robotic motion control camera rigs. The bearings are playing a key role in ensuring the overall system rigidity and repeatability of the camera booms and rigs. The British film industry is growing more quickly than any other part of the UK economy. Between July and September 2015, the UK’s movie business grew by 5.9 per cent as the ‘James Bond effect’ took hold. In contrast, the UK economy grew by just 0.5 per cent in the same period. In the last five years alone, the ‘motion picture, video and TV’ industry has grown by over 50 per cent, from being worth less than £2 billion to more than £3.1 billion. Based in Blindley Heath, Surrey, Mark Roberts Motion Control (MRMC) Ltd is a leading designer and manufacturer of robotic motion control solutions. From live broadcast and film productions to product photography, MRMC gives customers the ability to capture their visions via a groundbreaking suite of hardware and software. The product range includes camera booms, cranes and rigs, two- and three-axis motion control systems, as well as camera heads, sliders and controllers. Oscar-winning company Over the past 40 years, MRMC’s track record in technical and engineering excellence is unrivalled, earning critical acclaim including an Oscar for technical acheivement. Recent feature film projects include Sherlock Holmes, X-Men: Days of Future Past, Avengers: Age of Ultron, Pan, and Cinderella. Ronan Carroll, Technical Director at MRMC comments: “These days, camera motion control systems such as cranes and rigs need to be as compact, space efficient and lightweight as possible in order to minimise the costs associated with transporting these camera systems around the world, from one film location to another. Our customers also demand solutions that are reliable, accurate, repeatable and that provide a steady line-of-sight for the camera at all times. In order to design and manufacture systems such as these, we need to source high precision engineered components for our systems.” One critical engineered component on an MRMC camera rig is the bearing. As Ronan Carroll explains: “For camera rigs, the overall system rigidity or stiffness is critical to provide the camera operator with repeatability in terms of filming a scene. Therefore, when we engineer a camera rig, elimination of system backlash and minimising clearances in the supporting bearings are essential. The rigidity of the system starts with the basic mechanical structure of the rig, but the bearings are absolutely critical to the overall stiffness and accuracy of the complete, fully assembled system.” One example of an MRMC camera rig that utlilises thin section bearings from Carter Manufacturing is the SFH50, a camera motion control pan tilt head. This system is a high precision, highly repeatable one that is ideal for virtual studios, virtual reality, animation, time-lapse and web promotional videos. The system has an optional 360-degree roll axis and is compact and lightweight for film location work. The SFH50 uses Silverthin® thin section bearings from Carter Manufacturing to support the circular motion of the camera roll housings. The bearings are supplied as sealed, preloaded (K-Preload) units in 6” and 7” bore diameters. “The SFH50 is a super-sensitive piece of equipment and so we require bearings that eliminate camera ‘rock’. The Silverthin® thin section bearings are four-point angular contact units with just a few thousandth clearance to give us the system rigidity and repeatability that our customers need.” “The bearings are sealed units, as the camera rigs are used in both indoor and outdoor applications, so we need weather-resistant components. In addition, as the bearings are preloaded, this simplifies and reduces mounting and assembly of the bearings to our camera rigs,” states Ronan Carroll. Other robotic motion control systems from MRMC also utilise Silverthin® thin section bearings from Carter Manufacturing. The ‘Modula’ range of camera motion control rigs from MRMC provides extremely high accuracy and high rigidity for filming at very high speeds of movement. This system is capable of providing a wide range of shots at speeds in excess of 3 metres per second and has the strength to carry heavy payloads, whether a full film camera package or a 3D stereoscopic rig. The main pivot on the arm of the Modula is supported by a Silverthin® thin section bearing from Carter Manufacturing. This 2.5” bore diameter four-point contact (angular, radial and moment loads) bearing is preloaded and sealed. Pictured: the Modula high speed camera motion control system from MRMC “Carter has been supplying us with thin section bearings for the last five years or so. It’s been a mutually beneficial relationship, as deliveries, product quality and technical support from Carter has always been first class. We therefore look forward to continuing this relationship in the future as we begin to develop even more sophisticated robotic motion control systems for our customers,” concludes Ronan Carroll. Expertise in thin section bearings The Silverthin® range of precision thin section bearings help reduce total cost in a system by allowing for design efficiency over standard bearing sizes. As thin section bearings have cross-sections that do not change as bore sizes increase, there needs to be no change in the space requirements, as well as little change in the weight of the bearing, even as the diameter of an application increases. Thin section bearings are made from 52100 chrome steel and 440C stainless steel. They can also be coated with platings such as thin dense chrome. A range of seal options are available, as well as race materials in stainless steel and specialist alloys, cermaic balls and special lubrication to suit specific applications. Thin section bearings from Carter are currently being utilised on a variety of camera booms and robotic motion control rigs for a number of science fiction/space-related feature films in the UK. Karl Brundell, Managing Director at Carter Manufacturing Ltd comments: “Carter Manufacturing has many years of experience in thin section bearings. We also have the capability to produce small volume samples for prototyping purposes, right up to large volume production for manufacturing requirments and OEMs. A rapid turnaround on parts specifically to meet customers’ requirements enables our customers to test and approve products quickly and competitively.” For more information on the Silverthin® range of precision thin section bearings, please call the Carter Manufacturing sales department on 44 (0)1865 821 720 or email sales@carterbearings.co.uk