Precisely positioning pallets in multi-station assembly systems

Vallance, R. Ryan; Morgan, Chris; Slocum, Alexander H.

doi:10.1016/j.precisioneng.2002.11.003

Cited by 23 publications

(10 citation statements)

References 13 publications

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“…Machined V-grooves engage with the hemi-spherical contacts in the base of the phantom frame. Two are full hemispheres and two are half hemispheres, for a total of six points of contact; thus, the frame is exactly constrained to the base using a split-groove kinematic coupling [34,35]. This design provides reliable angular engagement, without wobble.…”

Section: Design and Fabricationmentioning

confidence: 99%

Design of a Reconfigurable Quality Assurance Phantom for Verifying the Spatial Accuracy of Radiosurgery Treatments for Multiple Brain Metastases

Cobi

Gray

Mittmann

et al. 2019

Journal of Medical Devices

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Radiation therapy frequently involves highly customized and complex treatments, employing sophisticated equipment, that require extensive patient-specific validation to verify the accuracy of the treatment plan as part of the clinical quality assurance (QA) process. This paper introduces a novel, reconfigurable QA phantom developed for the spatial validation of radiosurgery treatments of multiple brain metastases (MBM). This phantom works in conjunction with existing electronic portal imaging detector (EPID) technology to rapidly verify MBM treatment plans with submillimeter accuracy. The device provides a 12 × 12 × 12 cm3 active volume and multiple, independently configurable markers, in the form of 3 mm diameter radiopaque spheres, which serve as surrogates for brain lesions. The device is lightweight, portable, can be setup by a single operator, and is adaptable for use with external beam radiotherapy (EBRT) techniques and stereotactic linear accelerators (LINACs). This paper presents the device design and fabrication, along with initial testing and validation results both in the laboratory, using a coordinate measuring machine (CMM) and under simulated clinical conditions, using a radiosurgery treatment plan with 15 lesions. The device has been shown to place markers in space with a 0.45 mm root-mean-square error, which is satisfactory for initial clinical use. The device is undergoing further testing under simulated clinical conditions and improvements to reduce marker positional error.

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Section: Design and Fabricationmentioning

confidence: 99%

Design of a Reconfigurable Quality Assurance Phantom for Verifying the Spatial Accuracy of Radiosurgery Treatments for Multiple Brain Metastases

Cobi

Gray

Mittmann

et al. 2019

Journal of Medical Devices

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“…The pallet itself may have locating holes or pins, as illustrated in Figure 4, that assist with the accurate and repeatable positioning of it on the assembly station. Vallance et al [32] have presented a methodology for the exact positioning of pallets in multi-station assembly using split-groove kinematic coupling.…”

Section: The Principle Of Transferred Reconfigurabilitymentioning

confidence: 99%

The design of reconfigurable assembly stations for high variety and mass customisation manufacturing

Padayachee

Bright

2013

sajie

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The economical production of mass customised and high variety goods is a challenge facing modern manufacturers. This challenge is being addressed, in part, by the on-going development of technologies that facilitate the manufacturing of these goods. Existing technologies require either excessive inbuilt flexibility or frequent changes to the machine set up to provide the manufacturing functions required for the customisation process. This paper presents design principles for automated assembly stations within the scope of mass customisation. Design principles are presented that minimise the hardware and operating complexities of assembly stations, allowing stations to be easily automated for concurrent mixed model assembly with a First In First Out (FIFO) scheduling policy. A reconfigurable assembly station is developed to demonstrate how the proposed design methods simplify the creation and operation of an assembly station for a product family of flashlights. OPSOMMINGDie ekonomiese vervaardiging van grootskaalse aangepaste en hoë verskeidenheid goedere is 'n uitdaging wat hedendaagse vervaardigers in die gesig staar. Die uitdaging word deels geadresseer deur die ontwikkel van tegnologieë wat die vervaardiging van hierdie goedere fasiliteer. Bestaande tegnologieë vereis egter uitgebreide ingeboude aanpasbaarheid of gereelde veranderinge aan die masjienopstelling, om die vervaardigingvermoë deur die aanpassings proses vereis, te verskaf. Hierdie artikel hou ontwerpbeginsels voor vir geoutomatiseerde monteerstasies binne die bestek van massa aanpasbaarheid. Die ontwerpbeginsels minimeer die hardeware-en bedryfkompleksiteit van monteerstasies. Hierdie benadering vergemaklik dit om stasies te outomatiseer vir gelyklopende gemengde model montering met 'n Eerste-In-Eerste-Uit (FIFO) skeduleringsbeleid. 'n Herkonfigureerbare monteerstasie is ontwikkel om te demonstreer hoe die voorgestelde ontwerpbeginsels die skep en bedryf van 'n monteerstasie vir 'n produk-familie van flitsligte vereenvoudig.

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“…The design concept and schematic of the groove layout is shown in Fig. 20a [37]. This design allows for greater tipping stability and also facilitates coupling rectangular pallets in transfer line machines often used in automated assembly systems.…”

Section: Split Groove Kinematic Couplingsmentioning

confidence: 99%

Kinematic couplings: A review of design principles and applications

Slocum

2010

International Journal of Machine Tools and Manufacture

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a b s t r a c tFrom the humble three-legged milking stool to a SEMI standard wafer pod location to numerous submicron fixturing applications in instruments and machines, exactly constrained mechanisms provide precision, robustness, and certainty of location and design. Kinematic couplings exactly constrain six degrees of freedom between two parts and hence closed-form equations can be written to describe the structural performance of the coupling. Hertz contact theory can also be used to design the contact interface so very high stiffness and load capacity can also be achieved. Potential applications such as mechanical/electrical couplings for batteries could enable electric vehicles to rapidly exchange battery packs.

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Precisely positioning pallets in multi-station assembly systems

Cited by 23 publications

References 13 publications

Design of a Reconfigurable Quality Assurance Phantom for Verifying the Spatial Accuracy of Radiosurgery Treatments for Multiple Brain Metastases

Design of a Reconfigurable Quality Assurance Phantom for Verifying the Spatial Accuracy of Radiosurgery Treatments for Multiple Brain Metastases

The design of reconfigurable assembly stations for high variety and mass customisation manufacturing

Kinematic couplings: A review of design principles and applications

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