Functional PD Diameter Thread Gauges
THREAD MEASUREMENT Atlas Copco Tightens Up on Internal Thread Measurement with Gauge Setting System from Bowers Group CASE STUDY
that we plan to upgrade. We have shown some of our customers around and they’re amazed by the set-up we’ve got now; it’s really working well for us! Many of the components manufactured by Atlas Copco are nickel plated in order to provide corrosion resistance for parts that will be typically be used in subsea conditions, and exposed to salt water. As saltwater can be extremely corrosive the components need to be exceptionally accurate considering the critical applications that they are part of. If a part doesn’t meet tolerance, and is the wrong size, they will not meet stringent design criteria and will not be passed off by the inspection team. Components used in the oil and gas industry are also subjected to extremely high pressures. For example, an error in machining or measurement could result in an oversized thread. If used in an application where high pressure is a factor, an oversized thread may result in what is commonly known as ‘thread-strip’, so it is imperative that manufacturing & inspection processes are adhered to stringent design principles. The connectivity that the Gagemaker system offers is also a huge benefit to Atlas Copco. The business was extremely keen to streamline the manufacturing process, and the Gagemaker offers a SPI output cable to transfer data to spreadsheets at the touch of a button. Digital readouts allow Atlas Copco to produce reports in order to provide customers with definitive evidence that manufactured components meet ISO standards and British standards. This electronic, adjustable calibration and measurement centre will inspect parts, preset indicator system gages, and calibrate a variety of hand held inspection gauges. Suitable for use on the shop floor or in the calibration lab, the Mic Trac system contains receiver pads, which are precision ground in matching sets, and used as parallel surfaces for measuring or holding fixtures. Quality Inspection Manager, Darren Cleaver continued: We are very happy with the service and support we have received from Bowers Group and are confident that should be need further assistance they will be more than happy to help. The Gagemaker has certainly helped us on our way to complete digitalisation, which is one of our aims for the future. Connectivity and data transfer capabilities provided by the Gagemaker are exceptional, and have really helped to streamline our processes. We are even looking at introducing virtual and augmented reality into our manufacturing and training; watch this space!
At a Glance
• External Thread Roll Gauge
Features • Both series of these functional diameter gauges inspects the effects of all thread element variations and report deviations. • The gauges must be preset to a Nominal predetermined dimension using gauge blocks, micrometers, or the MIC TRAC measurement centre.
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Atlas Copco identified the need to further develop the way they checked internal threads on components. Instead of using ‘Go/no-go’ gauges, the company required a measurement method that was more specific for certain applications, and would meet its goal of continuous improvement. Bowers Group provided Atlas Copco with the Gagemaker system to measure the internal threads on a variety of components, including hydraulic bolt tightening tools. The Gagemaker allows Atlas Copco to provide more detailed feedback on tolerance to customers. For example, instead of giving a ‘pass’ or ‘fail’ result, they are now able to specify the exact measurement by which the tolerance has been met; or indeed, missed. Therefore, if a middle tolerance is achieved, the exact figure can be determined; accurate down to 5 decimal places. We use it primarily for measuring threads at the moment, but we plan to have several units in place for other manufactured parts throughout the business. Our next aim is to use a Gagemaker to measure internal and external splines, for increased accuracy and a higher level of control over the manufacturing process.Atlas Copco’s Quality Inspection Manager, Darren Cleaver said: The majority of machinists here at Atlas Copco in Wolverhampton use the Gagemaker system. It has enabled us to halve the number of gauges we buy because it offers such flexible measurement capabilities. Go/no go gauges are used at present, and although they are perfectly adequate, they are becoming an outdated method
90-RG7000
Functional PD Thread Gauges
Range (inch)
Code No
90-RG7000
5/8" to 4"
90-RG7001
4" to 8"
90-RG7002
8" to 12"
90-RG7003
12" to 16"
90-RG7004
16" to 20"
90-RG7005
20" to 24"
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Bowers Group | sales@bowersgroup.co.uk | www.bowersgroup.co.uk
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