Round Tensile Specimen Preparation Machines

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Round Tensile Specimen Preparation Machines
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Round specimens are turned rather than milled, and the finish left on the gauge length matters as much as the diameter: tool marks give a crack somewhere to start and pull the result down. NextGen supplies CNC lathes that produce round tensile specimens to ASTM E8 and to ASTM B557 for aluminium and other non-ferrous alloys.

The classic model suits a laboratory preparing specimens between other work, while the industrial model is built for continuous production, with higher spindle speed and a larger coolant capacity. Programs for the standard geometries come ready to run, machines are installed and commissioned by our engineers, and support continues for the life of the lathe.

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What Round Specimen Preparation Does

Round tensile specimens are turned from bar or cut blanks on a lathe. Gauge diameter, shoulder transitions and gauge length all have to repeat, because the tested area is calculated from them, and the finish left on the gauge length matters as much as the diameter. A CNC lathe holds those dimensions from batch to batch and removes the wait for an outside machine shop. Typical shapes are standard round bars, sub-size specimens, threaded tensile specimens, fatigue bars and button-head tensile bars.

Standards for Round Tensile Specimens

ASTM E8/E8M is the main reference for round tensile specimens of metals, and ASTM B557 applies to wrought and cast aluminum and magnesium alloy products. DIN 50125 defines round, flat and threaded-end test pieces, and ISO 6892-1 is the international tensile method. The lathes hold the standard geometries in a library and accept custom parameters on the same touchscreen.

What Affects Round Specimen Quality

Tool marks give a crack somewhere to start and pull the result down, so the finish on the gauge section is controlled along with the diameter. The starting stock has to be centered, which is why the first step, center drilling, is where a lot of round-specimen variation starts and is worth standardizing. Stable tooling, circulating coolant and secure workholding keep the cut consistent through repeated cycles.

The lathes turn heat-treated steels, copper, nickel, aluminum and magnesium alloys. Programs for the standard geometries come ready to run, the Classic Upgrade moves files and parameters over Wi-Fi, Ethernet or USB, and a machinist keeps full CNC control when another part has to be turned.

Round Specimen Preparation Machines from NextGen

The TensileTurn CNC Classic Upgrade takes specimen diameters up to 1.5 in (45 mm) and cuts material up to 55 HRC, with a triple clamping fixture for several samples per setup and a 15 in FANUC touchscreen. The TensileTurn CNC Industrial Upgrade adds automated center drilling and an 8-position electric tool turret on a granite base.

The Classic Upgrade swings Ø11.8 in (300 mm) over the bed, and the Industrial Upgrade swings Ø8 in (203 mm) with a 2 hp main motor and a 10 gal (38 L) coolant tank. Both are installed and commissioned by NextGen engineers.

For Laboratories

One partner to equip your complete metals laboratory

Round specimen preparation is where a tensile laboratory starts. NextGen equips the rest of it too, from flat specimen preparation to tensile and impact testing, hardness and metallography, and stays responsible for it after delivery.

  • Equipment, fixtures and software
  • Installation, training, calibration
  • Lifetime technical support

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FAQs

The classic model suits a laboratory preparing specimens between other work, while the industrial model is built for continuous production. The Classic Upgrade has a 15 in FANUC touchscreen and runs on single-phase 220 V with a pneumatic connection, while the Industrial Upgrade runs on 220 V AC at 20 A. Request a quote.

Standard round bars, sub-size specimens, threaded-end tensile bars, button-head and fatigue specimens can all be produced. A technician without a machining background can prepare them from the touchscreen library, while a machinist keeps full FANUC CNC control for general turning, and the dimensions repeat across batches so results stay comparable.

They hold round tensile specimen formats from ASTM E8 and ASTM B557, which covers aluminum and magnesium alloys, along with commonly used ISO and DIN profiles. Custom dimensions are entered on the same touchscreen, so internal methods and special geometries can be programmed without writing a part program.

Both machines accept round, square or irregular starting stock. The Industrial Upgrade turns most metallic materials, including heat-treated steels, copper, nickel and aluminum and magnesium alloys, and specialty grades such as Inconel. The Classic Upgrade takes diameters up to 1.5 in (45 mm) and cuts material up to 55 HRC.

On the TensileTurn CNC Industrial Upgrade, center drilling standardizes the first step of round specimen preparation, which is where a lot of variation starts. It gives the stock a consistent workholding and alignment point before the gauge section is turned, so the cut starts from the same reference on each specimen.