Archive for September, 2017

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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CNC Tensilkut III for Hardened Steel

September 26, 2017

This is a video demonstration of the CNC Tensilkut III cutting out the gauge section for one specimen of 1.4mm thick hardened steel. The starting size was 3/4″; the finished specimen is in accordance with ASTM E8, with the .500″ x 2″ gauge section, and the included .003″ taper.

This demonstration is 8 minutes long, and shows the entire cutting process.  Please contact us for more information or a quotation.

RIP, Cassini

September 15, 2017

In 1997, the Cassini spacecraft was launched, with the expressed mission of exploring Saturn.  For the past 7 years, it has done that, sending back spectacular images of our ringed neighbor, along with chemical details about the atmosphere of the planet and its moons, and the composition of its rings.  Today, it crashed into the surface of Saturn, sending a bit of final information on its way to oblivion.

Why does this matter to Tensilkut?  Because the Jet Propulsion Lab was a customer, as were many of its suppliers, and the Tensilkut system was used to test the materials traveling into space for nearly 20 years.  We are proud to have contributed to this exciting voyage in our own, peripheral way.  RIP, Cassini, and thanks for the memories.

10-33 Tensilkut I

Tensilkut I

How Long will a Tensilkut Machine Last?

September 13, 2017

We had an inquiry from a customer for replacement templates for their Tensilkut I.  They couldn’t find a nameplate containing the model and serial number of the machine, so they sent us a photo instead.

Tensilkut I from the early 1960s

Tensilkut I from the early 1960s

Judging from the color and the lack of a stainless steel top plate, this machine was built in the early 1960s.  A corner is missing, the phenolic plate is broken on one corner, yet the machine still works well.  There is at least one other unit of this vintage still in everyday use.  After 50 plus years, that’s pretty good.

And, yes, we were able to supply templates to this customer.

To Cut Straight Strips

September 12, 2017

Straight strips are a very valuable commodity in the laboratory.  In addition to needing a straight strip as the basis for cutting a test specimen, whether tensile, compression or another test, the straight piece is necessary for flexural testing, and is very valuable for other tests, including hardness testing.  The Tensilsaw is a very convenient way to cut strips from small plaques of plastic, fiberglass, composites, glass laminates and other non-metallic materials.

Visit our website or our YouTube channel for more video demonstrations of the Tensilsaw and our other equipment.

 

September 11, 2001

September 11, 2017

16 years ago was the third attack upon American soil since our great nation was founded. Today, our hearts are with those who survived the collapse of the Twin Towers, and with the families of those who were lost in the Towers, the Pentagon, and especially on the 3 jet liners. Our gratitude to the families of the passengers on the fourth jet, who bravely took over and crashed that plane to save our nation’s capital from further destruction. We will never forget.

Notched Samples: Impact and Shear Testing

September 7, 2017

Tensilkut is known for high quality, accurate machines for preparing flat and round tensile bars.  But we also build machines for notching specimens, which is one of the hardest things to accomplish.  For Impact specimens in accordance with ASTM A370 for metal bars, we offer the Impactkut, a fast, accurate and durable machine which broaches the notches with a single stroke of the 24″ long

Charpy impact specimen, Izod impact specimen, Iosipescu Shear Test ssample

From top: ASTM A370 Impact specimen, ASTM D256 Fiberglass Impact specimens (2), ASTM D5379 Shear Test Specimen

broach tool.

ASTM D256 specimens are used for testing plastic or composite impact specimens; the Impactmill notches those specimens in one pass through the machine.

For Iosipescu Shear Test specimens in accordance with ASTM D5379 or ASTM D7078, the V-Mill notches both sides of the specimen quickly, with the notches perfectly aligned.  This machine was developed in response to customers in the aerospace industry, who were among the earliest to suffer the difficulties of preparing these notches.

Visit our website at the links above for these specific machines, or  for a summary of all of our products.

Tensilkut: Tensile Sample Preparation Gold Standard

September 5, 2017

Tensilkut has the capacity to accurately machine tensile specimens from ferrous and non-ferrous metals and non-metallics from .002″ thickness up to .250″ or more, depending upon the model of the machine and the hardness of the material.  The Tensilkut series is fast; test specimen preparation can be completed in as little as 3 minutes, depending upon the material and its thickness.  The machined edges are so finely finished that no hand finishing is required.  The capacity to satisfactorily machine such light gauges as .002″ thick allows testing of many materials for which specimen preparation would otherwise be significantly more difficult.

Tensilkut test bars

Some of the bars cut on Tensilkut machines include ASTM D638 Type I tensile bars, ASTM D412 Die C tensile bars, ASTM D1855 Type L Tensile-Impact specimens, ASTM D256 Impact specimens, and ASTM D5379 Shear Test Specimens.

pipe wall tensile sample

sample cut from large diameter pipe wall

Visit our website for more information on Tensilkut equipment to solve your flat sample preparation needs.

 

Happy Labor Day!

September 1, 2017

Labor Day is celebrated on the first Monday in September.  It was begun as a day to celebrate labor, and we honor that tradition by giving our team the day off, in hopes that they will spend the last weekend of the summer enjoying time with their families.  We at Tensilkut Engineering hope everyone who reads this has a safe and enjoyable weekend.

Tensilkut for cutting samples in accordance with ASTM E8 for tensile testing of metals.

Proper grip for use of Tensilkut Template