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Machining Processes - Screw Cutting, Thread Cutting, Thread Machining, Tapping

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Screw cutting refers the machining operation involved with cutting an internal or external thread onto a cylindrical component. Screwcutting also refers to all the various types of threads from common vee threads, square threads, acme threads, buttress threads and multi-start threads.

Screw cutting is usually performed in a lathe using a single point tool. Different pitches are possible by changing the turning relationship between the lead screw and the head stock of the machine. The headstock rotates the work piece, while the lead screw feeds the cutting tool along at a set rate per revolution of the spindle. A wide variety of thread shapes and sizes can be produced on one machine, including custom threads if required.

Tapered threads are also possible to screw cut however, a tapered turning, or copy turning attachment is required. All screw cutting or thread cutting operations can be easily replicated on a CNC lathe for large volume runs.

A specialized area of screwcutting is in the application of cutting drill threads. Drill threads are the tapered threads used on each end of a drill rod used for drilling holes for oil and gas extraction or mineral exploration. These threads are usually of the acme thread form and oilfield rods usually have a ‘fast taper’. Mineral industry rods commonly have parallel, square threads or reverse buttress threads.Very precise control over the sizes and thread fits are required to ensure maximum thread life. For oil industry drill threads, machine shops are usually required to have API certification. Most drill pipe thread ing requires a machine shop who has either lathes fitted with a tapered turning attachment, or CNC lathes with a large spindle bore. Machine shops screwcutting drill pipe also require access to approved thread gauges and for the petroleum industry they must be API certified.

 

Suppliers With This Capability

A1 Anco Engineering
  Athol Park SA
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Archer Enterprises Pty Ltd
  Somersby NSW
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Avtech Engineering
  Bellevue WA
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Command Engineering Pty Ltd
  Kirrawee NSW
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Dimac Tooling Pty Ltd
  DANDENONG SOUTH VIC
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DNA Engineering
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G & O Kert
  Acacia Ridge QLD
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Global Manufacturing Group
  Maryborough QLD
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Hardman Bros
  Dingley Village VIC
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Harrop Engineering Australia
  Preston VIC
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Hounslow Engineering
  Bayswater VIC
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Jenkin Bros Engineers (Australia) Pty Ltd
  Bayswater VIC
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Kilner's Engineering
  Bulimba QLD
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Romar Engineering
  Sefton NSW
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Royal Australian Mint
  Deakin ACT
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