Archive for the ‘Tensilathe/505’ Category

Turning Round Tensile Bars

September 29, 2017

Turning round tensile test bars has always been a difficult and tedious process.  A full charge machinist can turn a test specimen using a lathe, but it will take some time, and, unless the machinist is fastidious, it may not be within the tolerances required by the specification.  Additionally, since machinists will often turn bars using only the largest possible passes, the bar will likely need hand finishing to remove distortion caused by the turning process.

Tensilkut has two machines designed to allow you to turn round tensile bars in accordance with ASTM E8, ASTM A370, JIS, DIN and ISO specifications in the lab.  Technicians without previous machining experience can learn to run these machines in short order; as with our other machines, these machines are supplied with a self-instruction manual, so it can be used by different operators as time goes on.

The Tensilathe/505 is our semi-automatic tracing lathe.  It operates from a Master Template, which controls the shape and dimensions of the specimen.  The operator needs only to dial in each cut to prepare a perfect tensile bar.

Tensilathe/505 semi-automatic tensile sample turning machine

Tensilathe/505 semi-automatic tensile sample turning machine

The CNC Tensilathe is the automated round test specimen preparation system.  This machine runs on a Windows-based microcomputer; specimen preparation is accomplished with a point and click software system.  After setting up the specimen, the operator is free to complete other tasks while the sample is turned automatically.

CNC Tensilathe for the automatic turning of round tensile specimens from most metals

CNC Tensilathe for the automatic turning of round tensile specimens from most metals

Please call 865-982-6300 for further information, or fill in the contact form below for a speedy response.

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Tensilathe/505

April 9, 2009

Turning round tensile bars has always been, at best, a laborious process.  In the mid-1980’s, however, our customers began to ask for a machine to enable them to turn their bars in the lab.  While Tensilkut had long made preparation of flat bars easy, round test bar turning hadn’t been brought into to the laboratory’s realm.

In the late 1970s, companies had begun downsizing their personnel, and automating many aspects of production.  Part of this was due to the retirement of the World War II era production workforce.  Regardless of the causes, there were suddenly fewer machinists to prepare test specimens for labs.  At the same time, customers began demanding that companies do more testing of their products – raw material and components of finished products.  With the rise in demand for the capability to turn round test bars in the lab, the concept of the tracing lathe dedicated to test specimens, and easy enough for lab technicians without extensive machinist training to run became a reality.

Tensilathe/505

Tensilathe/505

The Tensilathe/505 is a precision, hydraulic tracing lathe.  It traces the contours of the specimen into the bar using a template manufactured by Tensilkut Engineering, which contains the exact lengths of the gauge section, reduced section, and grips.  Since it’s a hydraulic lathe, the movement both left to right and forward and backward of the cutting tool is very smooth, ensuring an even transition from reduced section to radius.  The lathe uses standard tooling, so it’s easy to match the tooling being used to the material being cut.

The Tensilathe is not fully automated.  The tracer moves back and forth without operator involvement beyond starting the cutting cycle, but the customer must turn the micrometer knob to dial in the depth of each cut.  There is a stop which can be reset, so the user need only keep track of the size of the first bar of a given size; thereafter, he can set the stop to prevent the bar from being cut undersized.  Of course, each bar should be checked to insure that it is the correct diameter in the gauge section before testing.

Tensilathe/505 tracing head

Tensilathe/505 tracing head