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.



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


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